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Gavin Draper's SQL Server Blog

Software Dev/DBA living the dream in sunny Brighton, UK. I've been playing with SQL Server about nearly 20 years now and still feel just as clueless as I did back then. I love writing about things I find as I go along.

Archives: May 2018

SQL Server Minimally Logged Inserts (Assume Nothing!)

Side note : I originally started this post to show with examples all the scenarios where you can get minimal logging copying data from one table to another in SQL Server. I’m running SQL Server 2017 CU7 and it quickly turned out that I couldn’t get minimal logging to happen…

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0 comments, 108 reads

Posted in Gavin Draper's SQL Server Blog on 29 May 2018

SQL Server Minimally Logged Inserts (Assume Nothing!)

Side note : I originally started this post to show with examples all the scenarios where you can get minimal logging copying data from one table to another in SQL Server. I’m running SQL Server 2017 CU7 and it quickly turned out that I couldn’t get minimal logging to happen…

Read more

0 comments, 103 reads

Posted in Gavin Draper's SQL Server Blog on 29 May 2018

SQL Server Debugging With RAISERROR Instead Of Print

When testing/debugging TSQL it’s common to use the print statement throughout to see what was happening where in much the same way that other languages use things like console.log.

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0 comments, 72 reads

Posted in Gavin Draper's SQL Server Blog on 21 May 2018

SQL Server Debugging With RAISERROR Instead Of Print

When testing/debugging TSQL it’s common to use the print statement throughout to see what was happening where in much the same way that other languages use things like console.log.

One of the big issues with print is it buffers and you can’t control when it gets written to the output… Read more

0 comments, 83 reads

Posted in Gavin Draper's SQL Server Blog on 21 May 2018

SQL Server Error Handling In Depth

TRY/CATCH RAISERROR Pre SQL Server 2012

Since SQL Server 2005 we’ve had TRY CATCH syntax in SQL Server handle errors. If an error occurs inside a try block execution will leave the try block and enter the catch statement It’s inside the catch statement that you can do any error… Read more

0 comments, 66 reads

Posted in Gavin Draper's SQL Server Blog on 20 May 2018

SQL Server Error Handling In Depth

TRY/CATCH RAISERROR Pre SQL Server 2012 Since SQL Server 2005 we’ve had TRY CATCH syntax in SQL Server handle errors. If an error occurs inside a try block execution will leave the try block and enter the catch statement It’s inside the catch statement that you can do any error…

Read more

0 comments, 73 reads

Posted in Gavin Draper's SQL Server Blog on 20 May 2018

SQL Server Triggers and Transactions

In this post I’m going to detail with examples how triggers behave with transactions…

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0 comments, 37 reads

Posted in Gavin Draper's SQL Server Blog on 19 May 2018

SQL Server Triggers and Transactions

In this post I’m going to detail with examples how triggers behave with transactions…

How Do Triggers Behave With Transactions?

To demo this let’s insert a record into a table that has an after insert trigger from a transaction and call rollback from the trigger. If you’ve read my nested… Read more

0 comments, 57 reads

Posted in Gavin Draper's SQL Server Blog on 19 May 2018

Creating Custom Conditions In SQL Server Policy Based Management

In my last post I covered some basic policy based management examples, in this post I want to cover writing custom conditions in TSQL.

Let’s image we want a policy that makes sure every table in our database has a RowVersion type field in it. As in the previous post… Read more

0 comments, 32 reads

Posted in Gavin Draper's SQL Server Blog on 17 May 2018

Creating Custom Conditions In SQL Server Policy Based Management

In my last post I covered some basic policy based management examples, in this post I want to cover writing custom conditions in TSQL.

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0 comments, 32 reads

Posted in Gavin Draper's SQL Server Blog on 17 May 2018

Managing SQL Servers With Policy Based Management

Policy Based Management has been in SQL Server since 2008 and allows you to define policies that can report issues when certain conditions are violated, it can also prevent changes that would violate a policy. It does this in a couple of ways…

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0 comments, 52 reads

Posted in Gavin Draper's SQL Server Blog on 16 May 2018

Managing SQL Servers With Policy Based Management

Policy Based Management has been in SQL Server since 2008 and allows you to define policies that can report issues when certain conditions are violated, it can also prevent changes that would violate a policy. It does this in a couple of ways…

  • On Demand : You execute the policy…

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0 comments, 50 reads

Posted in Gavin Draper's SQL Server Blog on 16 May 2018

SQL Server Save Time Managing Multiple Servers With Central Management Servers

Central Management Servers give us a way to manage a collection of SQL Servers as one, a query executed against a Central Management Server will run against every server in the group.

You can designate any SQL Server instance to be a Central Management Server by following this process in… Read more

0 comments, 39 reads

Posted in Gavin Draper's SQL Server Blog on 15 May 2018

SQL Server Building On Calculations With APPLY

I find myself using Apply more and more in my queries, aside from the usual reasons I’ve been finding I can write much clearer queries that reuse calculations and build on them rather than constantly repeating code.

Let’s look at an example imagine we have the following table…

CREATE TABLE

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0 comments, 24 reads

Posted in Gavin Draper's SQL Server Blog on 14 May 2018

SQL Server Management Studio Intermittently Hangs Browsing a Database

If you’re seeing SSMS hang/lock timeouts when expanding nodes in the object explorer for a database it’s almost definitely caused by schema modification (SCH-M) locks. Normally SCH-M locks don’t cause a problem as they are so short lived but if you’re making schema changes inside long running transactions you can… Read more

0 comments, 24 reads

Posted in Gavin Draper's SQL Server Blog on 13 May 2018

SQL Server Corruption - Bring Order Out Of Chaos

I wanted to document a couple of important tasks you should be doing as part of your SQL Server maintenance/backup strategy to not only recover from corruption with the smallest amount of loss but also be aware of it as soon as possible. If not setup correctly your database could… Read more

0 comments, 26 reads

Posted in Gavin Draper's SQL Server Blog on 12 May 2018

SQL Server Database Snapshots

What Are They

Database snapshots are a readonly point in time version of a database. You can use them for things like readonly queries that don’t need to be on live data or even as an addition to part of your backup process. For example you could create a snapshot… Read more

0 comments, 25 reads

Posted in Gavin Draper's SQL Server Blog on 11 May 2018

SQL Server Partition Swapping

When working with large amounts of data in ETL jobs it can often can sink a lot of time inserting new data into a table and archiving old data out.

For example imagine we have a reporting table in our data warehouse that stores the last 12 completed months of… Read more

0 comments, 28 reads

Posted in Gavin Draper's SQL Server Blog on 10 May 2018

SQL Server Snapshot vs Read Committed Snapshot

For a quick introduction to transaction isolation levels see my previous post on them.

Once snapshot isolation is enabled on a given database you can use it just like any other transaction level by setting it on any given query. Read Committed Snapshot (Also known as RCSI for read committed… Read more

0 comments, 28 reads

Posted in Gavin Draper's SQL Server Blog on 8 May 2018

SQL Server Why Isn't My Transaction Log Truncating

The Transaction log growing is completely normal however there are situations where a transaction log can get to a state where it wont stop growing which if left unmonitored can fill drives and bring down servers.

Checkpoints

To understand how this works you first need to know what a checkpoint… Read more

0 comments, 24 reads

Posted in Gavin Draper's SQL Server Blog on 7 May 2018

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