SQLServerCentral Article

SSC Clinic: Can Implementing "Optimize for Ad Hoc Queries" Boost Performance for the SQLServerCentral.com and Simple-Talk.Com SQL Servers?

With the introduction of the instance-level option “optimize for ad hoc workloads” in SQL Server 2008, DBAs have a tool to deal with a problem known as plan cache pollution, or plan cache bloat. It’s often caused when one-time use ad hoc queries are sent to SQL Server from Object-Relational Mapping (ORM) solutions, such as LINQ, NHibernate, or Entity Framework. The problem can prevent SQL Server from using its available memory optimally, potentially hurting performance.

External Article

SQL Server Prefetch and Query Performance

Prefetching can make a surprising difference to SQL Server query execution times where there is a high incidence of waiting for disk i/o operations, but the benefits come at a cost. Mostly, the Query Optimizer gets it right, but occasionally there are queries that would benefit from tuning.

External Article

A first look at SQL Server 2012 Availability Group Wait Statistics

If you are trouble-shooting an AlwaysOn Availability Group topology, a study of the wait statistics will give a pointer to many of the causes of problems. Although several wait types are documented, there is nothing like practical experiment to familiarize yourself with new wait stats, and Joe Sack demonstrates a way of testing the sort of waits generated by an availability group under various circumstances.

Blogs

T-SQL Tuesday #198 Roundup: How Do You Detect Data Changes?

By

Thank you to everyone who participated in T-SQL Tuesday #198! When I wrote the...

Optimizing Redshift Performance by Configuring WLM Queues

By

Efficient query performance in Amazon Redshift often comes down to how well you manage...

PowerShell Strikes Back: Return of the Loop

By

Welcome back to PowerShell Strikes Back. We’re three weeks in, and the training is...

Read the latest Blogs

Forums

Dealing with huge heap tables

By JasonO

Recently, our dev teams approach me for advice on improving their huge heap table...

Merge Replication failing with Error converting data type nvarchar to numeric

By Leo.Miller

After upgrading 2 Merge Replicated databases to SQL 2022 and re-establishing the Merge Replication...

Why Your Index Isn't Being Used? - Reading Execution Plans to Find the Real Culprit

By Sanket Parmar

Comments posted to this topic are about the item Why Your Index Isn't Being...

Visit the forum

Question of the Day

Distance Metric Algorithms

What are the distance metric algorithms that can be used in VECTOR_DISTANCE()?

See possible answers