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What does update statistics command do?
Updating statistics ensures that queries compile with up-to-date statistics. However, updating statistics causes queries to recompile. We recommend not updating statistics too frequently because there is a performance trade off between improving query plans and the time it takes to recompile queries.
What is the purpose of update statistics in SQL Server?
These statistics provide distribution of column values to the query optimizer, and it helps SQL Server to estimate the number of rows (also known as cardinality). The query optimizer should be updated regularly.
Does update statistics affect performance?
As you can see, automatic updates to statistics have the potential to negatively affect query performance. The degree of impact will depend on the amount of data that has to be read to update the statistic, and the system resources.
Do I need to update statistics after rebuilding index?
The short answer is that you need to use UPDATE STATISTICS to update column statistics and that an index rebuild will update only index statistics. You can force an update to all statistics on a table, including index-stats and manually created stats, with the UPDATE STATISTICS (table name) WITH FULLS CAN. Syntax.
How often should statistics be updated?
Answer. For good database performance with a cost-based optimizer, run the update statistics procedure at least once a week. Run the two-step procedure for update statistics on the most important DB2® tables.
How often should I update statistics in SQL Server?
If you mean UPDATE STATISTICS WITH FULLS CAN, weekly or monthly is probably enough for most situations. However, I often set up a job to run nightly to run EXECUTE SP_UPDATESTATS in active user databases, because it only updates the stats that are needed. It takes much less time and resources to run.
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