Have no fear Git is here…

I am starting to work with version control and put my scripts under it. I hope it will help with my productivity and improve quality of scripts I am using.

As I am completely new to this GIT thing I used some help from http://classic.scottr.org/presentations/git-in-5-minutes/ to get it started!

It couldn’t be explained easier how to start working with Git! Thank you Scott !

 

 

ALLOW_SNAPSHOT_ISOLATION hanging in SQL Server 2016

In test environment I had SQL Server 2016 with RTM build (13.0.1601.5). Dev team asked to change option for one of the databases and set  ALLOW_SNAPSHOT_ISOLATION to ON as they wanted to test how much impact this may cause in certain scenario.

Usually change of this database setting takes ca. blink of eye but in this case it didn’t complete in seconds, minutes then hours…

Only wait type I saw was “ENABLE_VERSIONING” which “Occurs when SQL Server waits for all update transactions in this database to finish before declaring the database ready to transition to snapshot isolation allowed state. This state is used when SQL Server enables snapshot isolation by using the ALTER DATABASE statement.

“as explained by https://msdn.microsoft.com/en-us/library/ms179984.aspx

It made sense first all update transactions must complete and newly started transactions will be able to use versioning. Trouble was there were no open  transactions in this database. Lucky for me  it was TEST/DEV machine so to make sure there were no weird transactions I have restarted first SQL Server service. It didn’t help  to solve to problem so I have tried to change this option on database I have created only for this purpose. Guess what? It also didn’t succeed…

Actual solution that resolved the problem was installation of CU1 for SQL Server 2016. After CU1 has been applied setting ALLOW_SNAPSHOT_ISOLATION database option took  less then blink of an eye.

SQL Server 2016 for FREE (almost)

Developer edition of SQL Server 2016 (and 2014) is now available for free download from here. BUT as we all good know there ain’t free lunch so instead of paying 50 € (or so) for Developer Edition we’ll pay for it with letting Microsoft know how we are using SQL Server features . I saw this in CTP3 installation but I’ve been expecting that this feature will be removed in RTM. It seemed ok that MSFT wants to know our experience with the product and capture potential problems to fix them before releasing final version.

[SQL Server 2016] Hidden telemetry

I did install SQL Server 2016 RC3 recently and after answering all questions in the wizard and ticking all of the boxes I did check ConfigurationFile.ini to see what parameters installer uses.

Few parameters that caught my eye were related to telemetry:

; TelemetryUserNameConfigDescription

SQLTELSVCACCT=”NT Service\SQLTELEMETRY$RC2016″

; TelemetryStartupConfigDescription

SQLTELSVCSTARTUPTYPE=”Automatic”

; TelemetryStartupConfigDescription

ISTELSVCSTARTUPTYPE=”Automatic”

; TelemetryUserNameConfigDescription

ISTELSVCACCT=”NT Service\SSISTELEMETRY130″

SQL Server 2014 Service Pack 2

Service Pack 2 for SQL Server 2014 will be released closed to date of release of SQL Server 2016. Reason why this is interesting for DBA’s is the fact that just right next to several  fixes to database engine, some of the new features introduced in SQL Server 2016 will be also available in this build.

  • Information displayed in SYS.DM_DB_INDEX_USAGE_STATS will be reset only when database would go offline or server is restarted.
  • Other administrator friendly feature would be possibility to see progress of database recovery process with new xEvents with new actions
  • New spills warnings during sort operations in tempdb
  • Memory grant Showplan warning which shows in one of the 3 conditions:
  1. Under used – when the max used size is to small compared to the grant size. It is causing blocking and less efficient usage
  2. Over used – when the used size exceed the grant size. May cause out of memory on the server
  3. Excessive growth – when the dynamic grant increases too much. this may cause server instability and unpredicted query performance

 

 

 

SQL Server 2016 release date anounced

New version of SQL Server will be available in few weeks – it will be released on June 1st 2016!

As of now there is available Release Candidate 3 to download it please go here (registration required).

For those who will wait with upgrade of their systems there is also good news – some improvements to database engine from SQL Server 2016 will be also available in SQL Server 2014 SP2. More about it soon