Performance Tuning Archives

Oct 12

Using Extended Events to Find Statement Causing a Job to Run Long or Hang

By Lori Brown | Extended Events , Helpful Scripts , Jobs , Performance Tuning , SQL Administration , SQL Server

On one of the servers that we monitor, it was reported that periodically a specific job would seem to hang and take forever to complete. I was asked to set up something to help find exactly what statement in the job that was the root cause of the hang. Since the issue only occurred intermittently, […]

Aug 15

Adding a Missing Index Killed Performance

By Jeffry Schwartz | Indexes , Missing Indexes , Performance Tuning , Query Tuning , SQL Server

SQL Server 2017 suggested an index to improve performance, so we added it in a development environment. The “improvement” made the query run almost 50 TIMES longer than the original! See how we fixed this issue.

Mar 07

Should I Replace My FOR XML PATH String Merges with String_agg?

By Jeffry Schwartz | Function , Performance Tuning , Query Tuning , SQL Development , SQL Server

If you are looking for major performance gains, the answer is no. However, if you are using SQL Server 2017 and developing new code, you should consider using the new String_agg function that is available on SQL Server 2017 because code that uses this function is so much more readable and easier to write and […]

Jan 17

Troubleshoot SLEEP_TASK Wait Type

By Ginger Daniel | Miscellaneous , Performance Tuning , Query Tuning , SQL Development , SQL Server

Jobs on a SQL server can take milliseconds or minutes to complete depending on the size and complexity of your query and also the SQL environment on which it’s executing. It’s important to have a baseline or at least be familiar with the normal amount of time your SQL jobs take to execute. For a […]

Jul 26

How to Break an Existing Single Database File Into Multiple Files

By Lori Brown | Performance Tuning , SQL Administration , SQL Server

I occasionally come across some pretty good sized databases that are set up with a single data file. We recently have been working with a client to break up their single data file into multiple data files so that we can spread them over several different LUNs and so that they can take advantage of […]

Dec 14

Rx for Demystifying Index Tuning Decisions – Part 8

By Jeffry Schwartz | Missing Indexes , Performance Tuning , Query Tuning , SQL Administration , SQL Development , SQL Server

Review Due to the holiday week, this part will be shorter than usual. In Parts 1 through 7 of this blog series the author discussed various aspects of SQL Server indices such as: Types of indices and their variations, e.g., clustered, nonclustered, filtered, and covering Physical versus logical index access methods, e.g., seeks, scans, key/RID lookups, […]

Dec 07

Rx for Demystifying Index Tuning Decisions – Part 7

By Jeffry Schwartz | Missing Indexes , Performance Tuning , Query Tuning , SQL Administration , SQL Development , SQL Server

Review In Parts 1 through 6 of this blog series the author discussed various aspects of SQL Server indices such as: Types of indices and their variations, e.g., clustered, nonclustered, filtered, and covering Physical versus logical index access methods, e.g., seeks, scans, key/RID lookups, singleton lookups, and range scans Why index tuning should begin with […]

Nov 30

Rx for Demystifying Index Tuning Decisions – Part 6

By Jeffry Schwartz | Indexes , Missing Indexes , Performance Tuning , Query Tuning , SQL Development , SQL Server

Review In Parts 1 through 5 of this blog series the author discussed various aspects of SQL Server indices such as: Types of indices and their variations, e.g., clustered, nonclustered, filtered, and covering Physical versus logical index access methods, e.g., seeks, scans, key/RID lookups, singleton lookups, and range scans Why index tuning should begin with […]

Nov 30

Rx for Demystifying Index Tuning Decisions – Part 5

By Jeffry Schwartz | Missing Indexes , Performance Tuning , Query Tuning , SQL Development , SQL Server

Review Due to the holiday week, this part will be shorter than usual. In Parts 1 through 4 of this blog series the author discussed various aspects of SQL Server indices such as: Types of indices and their variations, e.g., clustered, nonclustered, filtered, and covering Physical versus logical index access methods, e.g., seeks, scans, key/RID […]

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Category Archives for "Performance Tuning"