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70-461 - Querying Microsoft SQL Server 2012/2014 - Dump Information

Vendor Name : Microsoft
Exam Code : 70-461
Exam Name : Querying Microsoft SQL Server 2012/2014
Questions and Answers : 297 Q & A
Updated On : November 12, 2018
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Microsoft 70-461 Exam (Querying Microsoft SQL Server 2012/2014) Detailed Information

70-461 - Querying Microsoft SQL Server 2012/2014


70-461 Test Objectives


Create database objects (20–25%)
Preparation resources
Work with data (25–30%)
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Modify data (20–25%)
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Troubleshoot and optimize (25–30%)
Preparation resources

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70-461 Querying Microsoft SQL Server 2012/2014

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70-461 exam Dumps Source : Querying Microsoft SQL Server 2012/2014

Test Code : 70-461
Test Name : Querying Microsoft SQL Server 2012/2014
Vendor Name : Microsoft
Q&A : 297 Real Questions

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Microsoft Querying Microsoft SQL Server

a simple method to Modernize Your SQL Server ambiance | killexams.com Real Questions and Pass4sure dumps

Joey on SQL Server

a straightforward way to Modernize Your SQL Server environment

There used to be few first rate alternatives for a DBA with a bunch of methods stuck on SQL Server 2008. however due to one easy trick, businesses on getting old infrastructure can take skills of Microsoft's contemporary records platform.

  • by Joey D'Antoni
  • eleven/07/2018
  • customarily in this column, I tell you lots about new and wonderful elements which are arriving to SQL Server and the broader Microsoft facts platform. To take competencies of those new facets, almost always, you should be on the latest liberate of SQL Server or maybe one version lower back.

    a extremely recent of illustration of this includes the infamous SQL Server message 8152 error:

    Msg 8152, stage sixteen, State 30, Line 13String or binary data could be truncated.The remark has been terminated.

    if you've labored with SQL Server for any length of time, you have likely seen this error. it is effortlessly unnecessary at assisting you troubleshoot what cost caused the error. fortunately, our chums on Microsoft's Tiger team had been aware about how painful this changed into to builders and carried out a repair in SQL Server 2017 cumulative update 12 (which is additionally coming soon to SQL Server 2016) that returns to you the table name, column and offending statistics in query. With this new fix, you can see:

    Msg 2628, degree sixteen, State 1, Line 30String or binary data would be truncated in desk 'AdventureWorks2016CTP3.dbo.myTable', column 'myString'. Truncated cost: long String of boring text '.

    word that you're going to need to use hint flag 460 to enable this messaging (Microsoft failed to need to smash existing functions that anticipated this message).

    right here's the capture: when you are nonetheless working SQL Server 2014 or older, you are going to likely certainly not see this fix lower back-ported into your database engine.

    whereas I used this error for example because it's been an issue for thus lengthy, there are numerous other points which have been currently delivered to SQL Server which are handiest on the latest releases of the platform. a number of examples encompass the query save, automatic tuning and adaptive query processing.

    you're probably analyzing this and saying, "we have a bunch of legacy apps from small utility carriers who won't assist SQL Server 2012, lots less a preview unlock of SQL Server 2019. Am I ever going to get to play with these new toys?"

    well, this is the place the one convenient trick is available in. At q4's Ignite conference, Microsoft introduced full assist for lengthy-term use of the compatibility stage option. Compatibility level is a database property that determines no longer most effective practical conduct, however also question optimizer conduct for a given database. historically, this property has been used as a cease-hole measure whereas upgrading a database engine version, used for a short time, before relocating to the latest level.

    moving to the latest compatibility degree should at all times be a purpose to your application. there are many efficiency enhancements in almost each new liberate that are covered by the compatibility level. despite the fact, this may no longer be viable for all applications, peculiarly third-party applications where you don't own the supply code.

    The cause of here is that an enormous chance of upgrading your SQL Server is your query execution plans changing for the more serious and degrading your software efficiency. Now, Microsoft has invested in applied sciences similar to auto-tuning to mitigate such dangers, however it additionally acknowledges that purchasers could need to dwell on an older compatibility level for the lifetime of their legacy software. This capability in case you see plan alterations, you could file a assist ticket with Microsoft aid to work with the consumer to isolate the foundation trigger and unravel it. additionally, Microsoft will help providers stream their functions to newer releases of SQL Server.

    Microsoft's new take on database compatibility degree has resulted in adjustments within the product's documentation, specifically on Compatibility levels and SQL Server upgrades, using Compatibility degree for Backward Compatibility and ultimate Practices for upgrading Database Compatibility level. right here, Microsoft deems compatibility level to be "a effective device to aid in database modernization, with the aid of permitting the SQL Server Database Engine to be upgraded, while keeping connecting applications [in] practical popularity by way of protecting the same pre-improve database compatibility degree. as long as the utility does not should leverage enhancements which are best accessible in a stronger database compatibility degree, it is a valid approach to improve the SQL Server Database Engine and keep the previous database compatibility degree."

    It additionally provides, "for brand new building work, or when an latest application requires use of new features, in addition to performance advancements executed in the query optimizer area, plan to improve the database compatibility degree to the latest obtainable in SQL Server, and certify your application to work with that compatibility stage."

    or not it's a clear trade from not so lengthy in the past, which ability Microsoft realizes the unstated hero feature of SQL Server is backward-compatibility, and has invested in assisting that stance to mitigate improve dangers.

    whereas here is a pretty good change from Microsoft, you nonetheless ought to deal with unbiased software vendors (ISVs), lots of whom will assist newer releases of SQL Server, but only if you upgrade the version of your utility utility. an excellent illustration of this is SharePoint Server 2013, which explicitly best helps as much as SQL Server 2014. in case you wanted to flow to a greater up to date free up of SQL Server and have help from Microsoft for SharePoint, you would should upgrade to SharePoint Server 2016.

    whereas RDBMS improvements are customarily dealt with with the aid of the infrastructure and DBA agencies of an IT corporation, utility utility enhancements are greater often dealt with through the business unit that owns the application, which constantly raises the amount of scrutiny. If the business has heavily customized the application, this could make the app-upgrade process more challenging.

    if you are a DBA who has a bunch of programs stuck on SQL Server 2008, what are you to do? the first element be sure to do is discuss this new Microsoft position along with your management, as that may be the primary hurdle to move earlier than taking place the path of a modernization assignment. 2d, you should contact your key application companies about each their guide for newer SQL Server releases, as well as their stance on the use of compatibility stage for their functions.


    improvements Coming to Azure SQL, SQL Server 2019 Preview | killexams.com Real Questions and Pass4sure dumps

    information

    improvements Coming to Azure SQL, SQL Server 2019 Preview
  • by Kurt Mackie
  • November 08, 2018
  • A raft of improvements are coming to Microsoft's database items, including migration guide to Azure SQL Database, Apache Kafka support on Azure adventure Hubs, Azure SQL statistics Warehouse advancements and yet one other preview of the arrival SQL Server 2019 product.

    Microsoft introduced the advancements at this week's flow Summit event for database administrators and builders.

    SQL Server 2019 CTP 2.1SQL Server 2019 continues to be at the preview stage, even though it's now reached neighborhood technology Preview (CTP) 2.1, in accordance with Rohan Kumar, Microsoft's company vp for Azure records, within the announcement. Microsoft is touting developed-in help for Apache Spark and the Hadoop disbursed File equipment in the coming SQL Server 2019 product.

    The newest preview of SQL Server 2019, specifically CTP 2.1, adds aid for deploying Python- and R-based mostly functions on clusters. It brings the ability to vicinity a "buffer pool in persistent reminiscence," which is thought to speed up I/O operations. there may be additionally greater diagnostics for troubleshooting lengthy-operating queries which have gotten blocked, amongst other perks.

    yet another feature that could be coming to SQL Server 2019 in a future preview free up might be a brand new "Accelerated statistics restoration" characteristic, Kumar mentioned.

    Hybrid and Migration SupportKumar stated that Microsoft has been "architecting for hybrid" to guide consumers that plan to run "records workloads in on-premises [servers] and in the cloud." To that end, Microsoft has been making it less complicated for SQL Server users to migrate towards Azure SQL services.

    Kumar pointed to the Azure SQL Database Managed instance service as a at present attainable answer for some businesses working SQL Server 2008 and SQL Server 2008 R2, which both will fall out of "prolonged aid" on July 9, 2019, becoming unsupported items. Azure SQL Database Managed example, which is a provider managed by way of Microsoft, is described as being an area in Microsoft's datacenters that's "dedicated to your needs and not shared with another valued clientele," in response to this Microsoft blog put up. Azure SQL Database Managed example makes use of the SQL Server 2017 enterprise edition, which has "backward compatibility with SQL Server 2008 and newer" server items, Microsoft indicated.

    Microsoft also is planning so as to add a new company crucial tier to the Azure SQL Database Managed illustration carrier for agencies working "mission-critical business apps with high I/O necessities." This enterprise critical tier is anticipated to reach "customary availability" (business unencumber) on "December 1," in response to Kumar. it's going to also have a reduce-cost "reserved means" pay as you go option that'll be in line with a "1 or three-year time period dedication" by using corporations, he added.

    Azure experience Hubs for Apache KafkaMicrosoft introduced on Wednesday that Azure event Hubs for Apache Kafka has reached well-known availability.

    practically, Microsoft brought aid for working the Apache Kafka open supply platform on Azure adventure Hubs, which is Microsoft's "cloud-native serverless answer" for handling "large-scale, actual-time circulate ingestion." Microsoft is touting using Apache Kafka on Azure during this way as a result of companies might not ought to hassle with configuring it, nor will they should control servers or networks. organizations may not have to alternate their Kafka-based functions to make it work with Azure event Hubs, Microsoft promised.

    Azure SQL information WarehouseMicrosoft had plenty to claim in an announcement about growth to its Azure SQL statistics Warehouse product, which supports operating queries across "petabytes of facts." The "Gen 2" edition of Azure SQL statistics Warehouse become launched lower back in April, the announcement stated.

    A coming "Workload significance" function will support optimize question execution on Azure SQL statistics Warehouse. it is going to let corporations "use a single SQL statistics Warehouse database to extra correctly run numerous workloads, removing the complexity of separate statistics warehouses for each solution," Microsoft explained. The Workload significance function will be purchasable "later this year at no additional can charge."

    a new Row-degree security function of Azure SQL data Warehouse has now reached popular availability reputation, Microsoft introduced on Wednesday. Row-degree safety gives organizations greater manage over who can access statistics, based on the facts's region in rows of tables. This function is supported via both "SQL authentication and Azure active directory authentication," the announcement referred to. groups create safety guidelines in accordance with "filter predicates" to handle access, although Microsoft plans so as to add guide for "block predicates" quickly. Row-level safety is at the moment obtainable in "just a few" Azure areas, but it's anticipated to be deployed global "inside the next two weeks." it's going to be purchasable at no additional can charge, the announcement indicated.

    Microsoft introduced management guide to Azure SQL records Warehouse via Azure advisor and Azure computer screen, in line with a Wednesday announcement. both of these tools are "configured by way of default" to work with Azure SQL records Warehouse.

    Azure guide now has an "Adaptive Cache" characteristic for picking when to scale the cache. It additionally has a "table Distribution" characteristic for addressing workload efficiency concerns. Microsoft delivered a "Tempdb" feature to Azure consultant so that IT execs can "take note when to scale and configure aid courses." Azure computer screen now indicates "close actual-time metrics within the overview blade" for Azure SQL facts Warehouse, the announcement indicated.

    moreover, Azure video display now has a "Diagnostic Logs" capability that can be configured to demonstrate "old query performance troubleshooting" counsel, according to a Wednesday announcement. These diagnostic log views are comparable to what may also be viewed with the current Dynamic administration Views approach, but curiously they don't seem to be as constrained. for instance, the announcement explained that "DMVs have a limit of 10,000 rows that may with no trouble be surpassed for intensive enterprise records warehouse workloads with heavy query endeavor." 

    developers now have access to a preview of a "SQL Server information tool" in visual Studio, which is bringing trade administration guide to Azure SQL Server statistics Warehouse, in keeping with a Wednesday announcement. it's a large deal for here motives, in response to the announcement:

    at the moment, exchange administration and deployment for SQL DW is a non-trivial effort where purchasers should build SQL and PowerShell scripts. This becomes an unmanageable journey as modern information warehouse options can have over lots of of statistics pipelines and lots of database objects. This difficulty is exacerbated as data warehouse deployments usually have numerous environments for construction, tests, and production.

    Microsoft is promising that the SQL Server facts device in visible Studio will add "a first class commercial enterprise-grade construction experience in your up to date data warehouse," and not using a extra need for guide scripting.

    about the creator

    Kurt Mackie is senior information producer for the 1105 business Computing neighborhood.


    Microsoft’s SQL Server gets developed-in aid for Spark and Hadoop | killexams.com Real Questions and Pass4sure dumps

    It’s time for the subsequent edition of SQL Server, Microsoft’s flagship database product. The business nowadays introduced the primary public preview of SQL Server 2019 and while yet another update to a proprietary database might also no longer look all that exciting at first glance, Microsoft is trying to do a number of rather wonderful issues with this replace.

    What’s on the core of all the most enjoyable updates is an acknowledgement that there are only a few companies that simplest use a single database product. So what Microsoft is doing with SQL Server is including new connectors that permit business to make use of SQL Server to question other databases, including these of Oracle, Teradata and MongoDB. This turns SQL Server into whatever of a virtual integration layer — yet the statistics on no account needs to be replicated or moved to SQL Server.

    but there is extra! SQL Server 2019 will come with built-in support for Spark and the Hadoop File system. That’s an acknowledgement of the recognition of those open-source equipment, as well as the value of massive statistics workloads that SQL Server, if it desires to say primary, must be able to guide, too, and it has to do so in a way that many companies are already well-known with.

    There’s a further open supply element here, too: SQL Server will guide these large facts clusters with the help of the Google-incubated Kubernetes container orchestration gadget. every cluster will consist of SQL Server, the Hadoop file device and Spark.

    As for the identify, it’s value noting that many pundits expected a “SQL Server 2018,” but Microsoft opted to skip a yr after SQL Server 2016 and 2017. So SQL Server 2019 it's.

    more Microsoft Ignite 2018 coverage


    70-461 Querying Microsoft SQL Server 2012/2014

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    70-461 exam Dumps Source : Querying Microsoft SQL Server 2012/2014

    Test Code : 70-461
    Test Name : Querying Microsoft SQL Server 2012/2014
    Vendor Name : Microsoft
    Q&A : 297 Real Questions

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    Querying Microsoft SQL Server 2012/2014

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    SQLCLR vs SQL Server 2017, Part 9: Does PERMISSION_SET Still Matter, or is Everything Now UNSAFE? | killexams.com real questions and Pass4sure dumps

    (last updated: 2018-11-01 @ 00:50 EDT / 2018-11-01 @ 04:50 UTC )

    SQL Server 2017 introduced a new security restriction for SQLCLR in the form of a system configuration option named, “CLR strict security”. So far, this series – SQLCLR vs SQL Server 2017 – has mostly focused on the publishing / deployment aspect of working with Assemblies within this new restriction. However, there might be additional implications of what can be done once an Assembly is loaded. The documentation seems to suggest that the PERMISSION_SET values of SAFE and EXTERNAL_ACCESS effectively no longer exist. Let’s look at the exact wording of the documentation and run a few simple tests to see: a) what SQL Server – the true authority – actually allows, and b) if the documentation accurately reflects that functionality.

    The Problem

    The documentation for both CREATE ASSEMBLY and ALTER ASSEMBLY states (as of 2018-10-30):

    ⚠ WarningCLR uses Code Access Security (CAS) in the .NET Framework, which is no longer supported as a security boundary. A CLR assembly created with PERMISSION_SET = SAFE may be able to access external system resources, call unmanaged code, and acquire sysadmin privileges. Beginning with SQL Server 2017 (14.x), an sp_configure option called clr strict security is introduced to enhance the security of CLR assemblies. clr strict security is enabled by default, and treats SAFE and EXTERNAL_ACCESS assemblies as if they were marked UNSAFE. …

    And farther down on that same page, there is a note stating:

    🛈 ImportantThe PERMISSION_SET option is affected by the clr strict security option, described in the opening warning. When clr strict security is enabled, all assemblies are treated as UNSAFE.

    The last sentence in each of those quoted statements certainly does seem to be saying that when “CLR strict security” is enabled, then UNSAFE is effectively the only PERMISSION_SET, or stated another way: then PERMISSION_SET effectively no longer has any effect. However, as usual, things are perhaps not so simple given that the wording is not explicitly stating that. It would be rather easy to add a few words to both statements to indicate that the PERMISSION_SET property is now being ignored. Other documentation makes similar claims (for example: allow updates Server Configuration Option). So, did they fail to explicitly state this, or was this not stated because it is not what is actually happening?

    The Tests Confirm Environment

    First, we need to make sure that we are using SQL Server 2017 (14.x) or newer since the “CLR strict security” configuration option does not (typically) apply to earlier versions. Technically, you can enable “CLR strict security” on SQL Server 2012 / 2014 / 2016, but that can only be set by a startup-only Trace Flag, and won’t be testable via , and is really only uesd for testing when preparring to upgrade to SQL Server 2017 or newer. The outcome of these tests will still apply to those earlier versions if “CLR strict security” is enabled, but for what we are trying to determine right now, we can keep things simple and focus on SQL Server 2017 and newer.

    SELECT @@VERSION; /* Microsoft SQL Server vNext (CTP2.0) - 15.0.1000.34 (X64) Sep 18 2018 02:32:04 Copyright (C) 2018 Microsoft Corporation Enterprise Evaluation Edition (64-bit) on Windows 10 Home 10.0 <X64> (Build 17134: ) */

    As you can see from that output (in the block comment), I am using SQL Server 2019, CTP 2.

    Next, we need to make sure that the “CLR strict security” instance-level configuration option is actually enabled, since that is the basis of this new security context that might be affecting the PERMISSION_SET property.

    SELECT cfg.[name], cfg.[value_in_use] FROM sys.configurations cfg WHERE cfg.[configuration_id] = 1587; -- clr strict security /* name value_in_use clr strict security 1 */ -- EXEC sp_configure 'show advanced options', 1; RECONFIGURE; -- EXEC sp_configure 'CLR strict security', 1; RECONFIGURE;

    As you can see, my instance does indeed have “CLR strict security” enabled. If it wasn’t enabled, I could execute the two EXEC statements to enable it.

    Please note that while “CLR strict security” is an “advanced” option, the “show advanced options” option does not need to be “1” in order to see the row in . However, to see and/or change the value of the “CLR strict security” option via sp_configure, the “show advanced options” option does need to be “1”.

    Test Setup

    Next, we create the testing database if it does not already exist:

    USE [master]; IF (DB_ID(N'PermissionSetTest') IS NULL) BEGIN CREATE DATABASE [PermissionSetTest] WITH TRUSTWORTHY OFF; ALTER DATABASE [PermissionSetTest] SET RECOVERY SIMPLE; END; GO USE [PermissionSetTest]; GO

    Now, for the first two tests I will use two different functions from the Free version of SQL# (a SQLCLR library that I created). While SQL# does contain many more functions than we need for these tests, the installer already handles enabling “clr integration” if it’s not already enabled, and setting up proper security. The SQL# installer does not disable “CLR strict security”, and it does not set TRUSTWORTHY to ON; it uses module signing ( https://ModuleSigning.info/ ). That’s several steps that I don’t need to re-create for the simple, quick tests that we are doing here.

    Install SQL# ( https://SQLsharp.com/free/ ) into the [PermissionSetTest] database (requires editing only the USE line of the install script).

    Check Run-time Restrictions

    EXTERNAL_ACCESS

    We already verified that “CLR strict security” is enabled. Here we will verify that the database property of TRUSTWORTHY is disabled, which is the better / preferred security setting:

    SELECT db.[name], db.[is_trustworthy_on] FROM sys.databases db WHERE db.[database_id] = DB_ID(); /* name is_trustworthy_on PermissionSetTest 0 */

    And we see that TRUSTWORTHY is disabled. Great.

    Next we verify that the Assembly containing the SQLCLR code that we are about to execute is marked as PERMISSION_SET = SAFE. We are verifying this because the documentation seems to be suggesting that when “CLR strict security” is enabled, the Assembly will be “treated as being UNSAFE“, which allows for accessing external resources.

    SELECT asm.[permission_set_desc] FROM sys.assemblies asm WHERE asm.[name] = N'SQL#.DB'; -- SAFE_ACCESS

    And yes, the Assembly is marked as being SAFE.

    Next we will create a global temporary table to be the destination table for a bulk copy operation. The .NET SqlBulkCopy class requires an external / regular database connection for the destination. Since an external connection is a different session, a local temporary table would not be visible to that destination connection. We could use a permanent table in [tempdb] instead of using a global temporary table, but the temp table will be automatically cleaned up when we close this query tab.

    CREATE TABLE ##TempDestination ([Col1] INT); -- TRUNCATE TABLE ##TempDestination;

    Now we run our first test. Please note that the default source connection for DB_BulkCopy is the internal context connection (i.e. the current session / transaction), and the default destination connection is the current instance using a trusted connection.

    EXEC SQL#.DB_BulkCopy @SourceQuery = N'SELECT [object_id] FROM master.sys.objects;', @DestinationTableName = N'##TempDestination';

    That returned the following error:

    The current PERMISSION_SET on the Assembly does not allow this operation (SqlClientPermission).    Please execute the following SQL in order to fix this:        EXEC SQL#.SQLsharp_SetSecurity 2, N’SQL#.DB’;

    It looks like we actually do not have the ability to access external reources. So we can execute the command suggested in the error message to see if that helps. And then we will verify that the PERMISSION_SET was changed.

    EXEC SQL#.SQLsharp_SetSecurity 2, N'SQL#.DB'; SELECT asm.[permission_set_desc] FROM sys.assemblies asm WHERE asm.[name] = N'SQL#.DB'; -- EXTERNAL_ACCESS

    Now that the PERMISSION_SET is EXTERNAL_ACCESS we will try again:

    EXEC SQL#.DB_BulkCopy @SourceQuery = N'SELECT [object_id] FROM master.sys.objects;', @DestinationTableName = N'##TempDestination'; SELECT * FROM ##TempDestination; -- 113 rows returned

    Ah ha. This time it worked.

    This test, by itself, pretty much proves that SAFE Assemblies are not being treated as if they were marked as UNSAFE, at least not in terms of executing code within them. But, we will try a few more tests to hopefully narrow down what “being treated as if marked as UNSAFE” does mean.

    UNSAFE

    For the second test we will execute code that requires the Assembly be marked as UNSAFE. The function is supposed to play a specified frequency for a specified number of milliseconds. This will work if you are using SQL Server Express LocalDB, which runs in user-mode and not as a background process, but otherwise you likely won’t hear anything. Either way, whether or not you can hear the tone has no impact on the permissions required to execute the code.

    SELECT asm.[permission_set_desc] FROM sys.assemblies asm WHERE asm.[name] = N'SQL#.OS'; -- SAFE_ACCESS SELECT SQL#.OS_GenerateTone(1000, 1000);

    That returned the following error:

    System.Security.HostProtectionException: Attempted to perform anoperation that was forbidden by the CLR host. The protected resources (only available with full trust) were: AllThe demanded resources were: UI

    Just like the first test, the Assembly being marked as SAFE did not allow the code to execute. And this time the actual .NET error message comes through and even mentions “full trust”, which equates to UNSAFE.

    So let’s try the next level of permissions:

    EXEC SQL#.SQLsharp_SetSecurity 2, N'SQL#.OS'; SELECT asm.[permission_set_desc] FROM sys.assemblies asm WHERE asm.[name] = N'SQL#.OS'; -- EXTERNAL_ACCESS SELECT SQL#.OS_GenerateTone(1000, 1000);

    That returned the same error:

    System.Security.HostProtectionException: Attempted to perform anoperation that was forbidden by the CLR host. The protected resources (only available with full trust) were: AllThe demanded resources were: UI

    Ok. Now we can try setting the Assembly to UNSAFE:

    EXEC SQL#.SQLsharp_SetSecurity 3, N'SQL#.OS'; SELECT asm.[permission_set_desc] FROM sys.assemblies asm WHERE asm.[name] = N'SQL#.OS'; -- UNSAFE_ACCESS SELECT SQL#.OS_GenerateTone(25000, 3000); -- Success (well, no tone, but no error either)

    And that finally worked. Once again we see that in terms of executing code, each PERMISSION_SET works just as it always had; there is no change in behavior from previous versions.

    Check Creation Restrictions

    If “being treated as if marked as UNSAFE” doesn’t apply to executing code, maybe it has to do with the verification steps done when executing the CREATE ASSEMBLY and ALTER ASSEMBLY statements? The verification steps can be found in the documentation for CREATE ASSEMBLY as well as on the following page: CLR Integration Programming Model Restrictions.

    For this test we will once again verify that “CLR strict security” is enabled. Then we will enable the database property of TRUSTWORTHY. While it is generally a bad idea to enable TRUSTWORTHY, doing so is one of the ways to get Assemblies to load if “CLR strict security” is enabled. The idea here is that we will create an Assembly that has a static class variable that is not marked as “readonly”. This is violation is something that can be caught when executing CREATE ASSEMBLY and ALTER ASSEMBLY. And, since Assemblies marked as UNSAFE are allowed to have non-“readonly” static class variables, if Assemblies truly are “being treated as if marked as UNSAFE“, then creating the Assembly should succeed, even if marked as SAFE.

    SELECT cfg.[name], cfg.[value_in_use] FROM sys.configurations cfg WHERE cfg.[configuration_id] = 1587; -- clr strict security /* name value_in_use clr strict security 1 */ ALTER DATABASE [PermissionSetTest] SET TRUSTWORTHY ON; SELECT db.[name], db.[is_trustworthy_on] FROM sys.databases db WHERE db.[database_id] = DB_ID(); /* name is_trustworthy_on PermissionSetTest 1 */

    The output shown above indicates that “CLR strict security” is still enabled, and now the database property of TRUSTWORTHY is enabled.

    The .NET C# code for the Assembly is:

    using Microsoft.SqlServer.Server; public class StoredProcedures { private static string CaughtByCreateAssemblyChecks = "Nope"; [SqlProcedure] public static void PrintHello() { SqlContext.Pipe.Send("Hello"); } }

    I have compiled that code into a DLL (i.e. an Assembly). We will then store the Assembly’s definition in temp table so that it can be used across multiple queries that are going to be executed individually and not in a batch. I used BinaryFormatter – an open-source tool that I created and host on GitHub – to convert the DLL into a string representation of the hex bytes needed for CREATE ASSEMBLY, broken into lines of 76 digits each. The Assembly definition has been shortened so that it could be posted here. You can get the full script (including all of the T-SQL commands in this post) at PasteBin: “CLR strict security” and PERMISSION_SET.

    CREATE TABLE #AssemblyBits ([HexBytes] VARBINARY(MAX) NOT NULL); INSERT INTO #AssemblyBits ([HexBytes]) VALUES (0x\ 4D5A90000300000004000000FFFF0000B80000000000000040000000000000000000000000\ ... 00000000000000000000000000000000000000000000000000000000000000000000000000\ 000000000000);

    Now that the Assembly definition is easily accessible (without having to paste multiple copies of that definition into the script), we can attempt the actual loading of the Assembly:

    -- Get Assembly definition from temp table: GO DECLARE @Assembly VARBINARY(MAX); SELECT @Assembly = [HexBytes] FROM #AssemblyBits; -- Create Assembly from that definition: CREATE ASSEMBLY [UnsafeStuff] AUTHORIZATION [dbo] FROM @Assembly WITH PERMISSION_SET = SAFE;

    That returned the following error:

    Msg 6211, Level 16, State 1, Line XXXXXCREATE ASSEMBLY failed because type ‘StoredProcedures’ in safe assembly ‘UnsafeStuff’ has a static field ‘CaughtByCreateAssemblyChecks’. Attributes of static fields in safe assemblies must be marked readonly in Visual C#, ReadOnly in Visual Basic, or initonly in Visual C++ and intermediate language.

    That didn’t work because of the checks performed on SAFE and EXTERNAL_ACCESS Assemblies. This behavior is also the same as it has been in all previous versions, going all the way back to SQL Server 2005 when SQLCLR was introduced. Perhaps enabling TRUSTWORTHY isn’t enough to allow loading unsigned Assemblies?

    For this final test, we will attempt to create the Assembly as UNSAFE:

    -- Get Assembly definition from temp table: GO DECLARE @Assembly VARBINARY(MAX); SELECT @Assembly = [HexBytes] FROM #AssemblyBits; -- Create Assembly from that definition: CREATE ASSEMBLY [UnsafeStuff] AUTHORIZATION [dbo] FROM @Assembly WITH PERMISSION_SET = UNSAFE; -- Commands completed successfully.

    Ah ha. That actually worked. This means that the checks done on the code in the Assembly, when executing CREATE ASSEMBLY and ALTER ASSEMBLY, are the same as they have been since SQLCLR was introduced; there is no change in behavior, at least not in terms of the checking the contents of Assemblies as they are loaded into SQL Server.

    Where Does That Leave Us?

    So far we have not seen any changes in behavior from prior versions of SQL Server with respect to the three PERMISSION_SET options. Has anything changed?

    Yes. One thing has changed: the security requirements for creating SAFE and EXTERNAL_ACCESS Assemblies are now the same as for creating UNSAFE Assemblies. When “CLR strict security” is enabled, and TRUSTWORTHY is disabled, you can no longer create:

  • SAFE Assemblies that are not signed
  • EXTERNAL_ACCESS Assemblies that are signed, but the associated signature-based Login has the EXTERNAL ACCESS ASSEMBLY permission instead of the UNSAFE ASSEMBLY permission
  • And so this is what “being treated as if marked as UNSAFE” actually means.

    Conclusion

    Given the current wording of the documentation for CREATE ASSEMBLY and ALTER ASSEMBLY, it’s easy to see how people would be quite easily confused about what the PERMISSION_SET property actually does when “CLR strict security” is enabled. It certainly does sound like there is only one effective value when that option is enabled: UNSAFE. But as we have seen, that is clearly not the case.

    The reality is that the only change is in the security requirements for creating / altering Assemblies. Going back to the explanation for this change (quoted at the beginning of this post), we can now understand that they are saying: since it is possible to do things in SAFE and EXTERNAL_ACCESS Assemblies that should only be possible in UNSAFE Assemblies , we need to provide the same level of explicit trust to all Assemblies, just in case.

    And so, putting all of this info and evidence together, we can restate the message as:

    ” When the instance-level configuration option “CLR strict security” is enabled, the requirements for loading Assemblies having a PERMISSION_SET of either SAFE or EXTERNAL_ACCESS , into SQL Server (using CREATE ASSEMBLY or ALTER ASSEMBLY) and into memory (by accessing anything inside the Assembly), are the same as they would be for loading an Assembly marked as UNSAFE. “

    I will submit documentation fixes for CREATE ASSEMBLY and ALTER ASSEMBLY so that this behavior is stated clearly.


    SQL Server 2016 preview shows off new features, improvements | killexams.com real questions and Pass4sure dumps

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    SQL Server 2016 incorporates customer wishes

    Farooq's client isn't alone in its rapid adoption of SQL Server 2016. With the recent release of the public preview, other SQL Server users are taking notice.

    Denny Cherry, owner and principal consultant of Denny Cherry and Associates Consulting, has two clients trying out SQL Server 2016. Cherry is tied in with the development team for SQL Server 2016 and, through the Microsoft Early Access Program, and has been able to work with SQL Server 2016 for the past three months. Because of the extra lead time, Cherry has a client who is in the process of putting SQL Server 2016 into production right now.

    Next Steps

    Find out more about the new features announced for SQL Server 2016

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    Upgrading to SQL Server 2012/2014 - How to Overcome the Top 5 ‘Gotchas’ | killexams.com real questions and Pass4sure dumps

    Jan 7, 2015

    Varun Singh

    Image courtesy of Shutterstock

    SQL Server 2012/2014 delivers compelling new capabilities that make an upgrade worthwhile. Many IT professionals agree that the AlwaysOn Availability Group (AG) feature offers the most value with its high availability (HA) capabilities to ensure continuous application availability.

    Synchronous replication technology in AlwaysOn lets applications scale out like never before, using more resources on more servers. With read-only access to secondary databases, SQL Server 2012/2014 can dramatically increase database I/O capacity on the back end. Grouping databases together into an AG also allows companies to specify that certain databases connect to particular applications, ensuring that they failover together.

    However, along the upgrade path, companies have also discovered key obstacles to achieving the new opportunities. Without awareness and understanding about these challenges – and their potential consequences – an organization’s upgrade to SQL Server 2012/2014 can be costly, inefficient, and plagued by system errors.

    Here are the top 5 SQL Server 2012/2014 ‘gotchas’ as well as tips for addressing them:
  • Backward compatibility
  • Licensing changes
  • Read/write split
  • Replication awareness
  • Automatic failover
  • 1-Maintain backward compatibility

    To avoid problems, as well as significant future rework, organizations need to address deprecated T-SQL features. For SQL Server 2012/2014, Microsoft will no longer support non-ANSI outer join syntax, requiring that all code be ANSI compliant.

    Because every new release brings deprecation of earlier compatibility levels, companies must be aware of level changes and the impact on their applications. In the case of SQL Server 2012, applications will deprecate to 2000 compatibility, while SQL Server 2014 deprecates to 2005.

    Companies also need to check with their ISVs to verify application support. Support may not be a given when compatibility levels become switched. An ISV with a contract to support an application on 2005 might not necessarily support it on 2012 running compatibility levels for 2005.

    If at all possible, companies should test their applications and scale them to the most modern standards during any upgrade. Best practices dictate that organizations switch to the highest compatibility level of the upgraded SQL Server version. Not doing this puts off the inevitable and the work associated with it, making more work for companies in the long run.

    2-Be aware of licensing changes

    With SQL Server 2012/2014, Microsoft has moved to a core-based licensing model for its Enterprise Edition. Regardless of the number of sockets or cores per-socket, organizations must now pay per core, and the licensing requires a minimum of 4 core licenses per physical processor. While minor variations exist due to individual licensing terms, moving to a 4-core enterprise license from a server license equates to a 4x cost difference on paper for most companies

    The licensing changes also affect customers installing SQL Server 2012/2014 in a virtual environment. If a company runs SQL Server on a VM guest, a minimum of 4 cores must be licensed in the Enterprise Edition. This requirement can be frustrating, as a company using a 2-core VM, for example, must still license for 4 cores even if they are only using half of them.

    It’s not all bad news. With significantly increased resource limits to the Standard Edition (up to 64 GB memory and 16 cores), companies also have a viable alternative to Enterprise Edition for the first time, as well as a solid migration path for the future. In addition, Microsoft has created the Business Intelligence Edition, delivering a Standard Edition SQL engine with the Enterprise Edition intelligence features.

    In addition to paying attention to core count and understanding the licensing pitfalls, companies should consider other ways to offset the higher licensing costs. By maximizing usage of secondary servers to process read loads, organizations can reduce the need to buy larger servers with more cores. Caching can also help reduce the number of queries to be processed, letting companies maintain the needed performance while buying fewer cores. In some instances, database query caching has been able to handle 80% of the database load, sending just 20% to the SQL Server database.

    3-Leverage read/write split – with app changes

    By allowing secondary servers to process read traffic instead of just sitting idle, AlwaysOn enables companies to serve more traffic and improve their application response times.

    However, to leverage this capability, applications must be modified to build support for read-intent strings to connect to secondaries. Furthermore, applications need to be modified to identify which queries/stored procedures to route to secondaries. This application modification takes up a lot of time and resources, often delaying companies from benefitting from SQL Server 2012/2014’s new scale out features.

    To solve this problem and avoid application modification, some companies have implemented either homegrown or third-party database traffic management software. Sitting between the application and the database, database traffic management software understands SQL syntax and can classify them as reads or writes. It can also discover the definition of a stored procedure from the database server to find out whether a particular stored procedure is a read-only or a read/write operation. With this detailed SQL state knowledge, the software can automatically load balance SQL traffic amongst primary and secondary servers, sending transactions and writes to the primary and distributing read-only traffic amongst the secondaries.

    By offloading the need to build this intelligence into the application, companies can quickly take advantage of SQL Server 2012/2014’s advanced features.

    4-Ensure replication awareness

    Because AlwaysOn is constantly replicating data from the primary server to the secondaries, the possibility emerges for replication lag. If the secondaries fall too far behind in replication, the data on secondary servers can become stale.

    While the primary server remains the authoritative source for writing to the database in SQL Server 2012/2014, the secondary server now has the same data, which allows users to read from it. However, in supporting reads from the secondary, organizations must be aware that 1) the secondary server will always be a little behind the primary server; and 2) applications need to define the threshold of tolerance for delay, i.e., to what level that data can be “behind” in timing.

    If applications are reading stale data, it can lead to inconsistent behavior. Different users might see different values for the same query, or – even worse – users might see older, incomplete data even when they have finished a transaction.

    Modifying applications to support replication awareness can be a highly complex and costly process, requiring the organization to build a replication-monitoring engine and integrate it with application code. That modified application can then check to make sure that each server to which it is sending reads is in sync with the primary server. Adding to the complexity, most applications, such as .NET or PHP, are written like an integrated script, making it even more difficult and time-consuming to achieve replication awareness.

    By integrating replication monitoring with load balancing and SQL flow control through the use of software, companies can establish a maximum replication delay threshold – without modifying any applications. Such software will not send reads to a secondary server that is more than one second behind the primary, for example. This approach keeps data access consistent even when supporting reads from secondary servers. The replication monitoring process can even alert administrators of potential networking or database issues that might have caused the replication lag or breakage in the first place.

    5-Enable automated failover

    SQL Server 2012/2014 limits automated failover to servers sitting within a single data center, despite having the ability to scale beyond a single data center. With virtual network name (VNN, also referred to as the Active Group Listener), SQL Server 2012/2014 provides a method to discover the new primary when a server fails.

    However, VNN has significant limitations since it redirects read-intent connections directly to the secondary server and does not act as an aggregation endpoint. This redirection can lead to increased downtime and application errors during failover as both the primary being failed and the secondary being promoted will drop their connections.

    One way around this limitation is to deploy software that acts as an abstraction layer between the database and the application. In this architecture, that software replaces the VNN as the destination for SQL connections. The software then routes SQL queries on behalf of the app, with detailed understanding of all queries. This architecture enables failover that is transparent to the application – with no dropping of the connections and queuing of inbound traffic so applications see few to no errors.

    Bottom Line - Focus on the Big Picture

    At the end of the day, a database upgrade is never just about the database. SQL Server 2012/2014’s new capabilities, including the AlwaysOn HA features, promise huge benefits, but they also create significant complexity.

    Companies must consider how an upgrade affects not only performance and costs but also other parts of their infrastructure. The challenges of programming applications to understand and leverage scaled out database infrastructure are many.  

    An upgrade can be a good time to consider making other architectural changes – such as creating an abstraction layer using a SQL proxy or database load balancing software.

    About the author:

    Varun Singh, Founder and CTO, ScaleArc

    As Chief Technology Officer, Varun leads ScaleArc’s product development and technology strategy. Varun also served as ScaleArc’s CEO from March 2009 to Sept 2013. Varun is a technologist with broad experience in several fields, from running Linux-based BBS systems in the pre-Internet days to writing about technology and open source software at PC Quest, CHIP, Digit, and Network Computing, to creating India’s top online technology brands such as TechTree and Tech2, to hosting technology shows on CNBC, TV18, CNN-IBN and ET Now. He led large web and application development teams as CTO at Network 18's web division and built the highly scalable technology behind large websites like IN.com, MoneyControl.com, and various other portals.



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