DBA Database scripts are on Github

It started with a tweet from Dusty

The second session I presented at the fantastic PowerShell Conference Europe was about using the...

SQL Server – Change in Identity() Property during transactions

Recently while working on a scenario I found that in case of transaction if you are doing insertion operation on...

Tempdb Metadata Contention in SQL Server – Table Variable Vs Temporary Table

In SQL Server, the concurrent creation of temporary tables from many sessions can lead to tempdb metadata contention. Tempdb metadata contention does not affect the concurrent creation of table...

AlwaysOn Availability Groups Synchronous Replica Readable Secondary Data Access Latency

With SQL Server AlwaysOn Availability Groups, when you configure a secondary in synchronous-commit mode for read-only access, there can be data access latency. If you make changes to your...

Seek or Scan – Cost Based Optimizer in SQL Server

When SQL Server has a choice of plans, it will compare the cost among a set of execution plans and will choose the cheapest one. In some cases, even...

Optimize for Ad Hoc Workloads – SQL Server Configuration Parameter

SQL Server configuration parameter “optimized for ad hoc workloads” can be very useful when you execute lots of single use ad hoc statements or dynamic SQL statements by reducing...

Extended Event Locks Lock Waits in SQL Server

When it comes to lock waits, one of the important information we need to know is which statement waited for locks and how long. This is possible with extended...

Extended Event Query Post Execution Showplan in SQL Server

Query Post Execution Showplan event is a very useful event to find problematic queries and execution plans based on CPU usage or duration while analyzing performance issues. It can...

PAGELATCH Waits with Update Statements in SQL Server – PAGELATCH_EX and PAGELATCH_SH

In SQL Server, concurrent writes or read / write to the same page can lead to PAGELATCH (like PAGELATCH_EX and PAGELATCH_SH) waits or what is knowns as PAGELATCH contention....

Tempdb Allocation Contention in SQL Server

In SQL Server, the concurrent creation of temporary objects (temporary tables and table variables) from many sessions can lead to tempdb allocation contention. This contention occurs on PFS and...