How Can the SQL Server Resource Governor Help You?

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• Kevin E. Kline

MANAGING ‘NOISY NEIGHBORS’ IN SQL SERVER If you’ve been managing databases for any length of time, you’ve probably had to contend with the “noisy neighbors” scenario. In this scenario,...

2017-02-10

4 reads

AlwaysOn Availability Groups Synchronous Replica Readable Secondary Data Access Latency

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

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...

2016-05-15

1 reads

Cardinality Estimation – Table Variable Vs Temporary Table in SQL Serve

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

SQL Server creates and maintains statistics for temporary tables, which lead to better cardinality estimation and optimal execution plan generation. Table variables have no statistics, which can result in...

2016-05-15

Extended Event Locks Lock Waits in SQL Server

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

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...

2016-05-15

11 reads

Extended Event Query Post Execution Showplan in SQL Server

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

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...

2016-05-15

3 reads

Filtered Statistics in SQL Server

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

In SQL Server, Filtered Statistics can improve cardinality estimation, i.e. when joining lookup table, or while joining fact table and dimension table. For this reason, SQL Server supports the...

2016-05-15

In-Memory OLTP Memory Optimized Table Variables Vs Disk Based Table Variable in SQL Server

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

Starting SQL Server 2014, it is possible to use memory optimized table variables. These are table variables declared using a table type which is memory optimized. Memory optimized table...

2016-05-15

5 reads

Optimize for Ad Hoc Workloads – SQL Server Configuration Parameter

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

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...

2016-05-15

3 reads

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

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

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....

2016-05-15

2 reads

Parallel Insert Into – Table Variable Vs Temporary Table in SQL Server

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• Ramesh Meyyappan’s SQL Server Performance Tuning Blog

In SQL Server, for insert into select statements, when the target for insert into is temporary table, the select statement can execute in parallel. When the target is table...

2016-05-15

2 reads