Updating index statistics sql
Go Up to Available object actions by DBMS The Update Statistics dialog lets you update the statistics for an active table or index.
As indexes grow and shrink in response to data modification, the accuracy of their statistics can deteriorate.
In following statement, I have specified an additional option of FULLSCAN, which implies that the complete table is scanned to update the statistics.
Do not collect distribution statistics - Does not collect basic statistics or distribution statistics on the columns.
Collect distribution statistics on key columns only - Collects both basic statistics and distribution statistics on key columns only.
If not, how My SQL database create an execution plan?
Does the My SQL update indexes and statistic with every UPDATE and INSERT?
ANALYZE TABLE analyzes and stores the key distribution for a table.
During the analysis, the table is locked with a read lock for My ISAM, BDB, and Inno DB.
My SQL 5.7.10Like @Adergaard, I have to disagree, too.
In my case a query that uses some fulltext index was very slow (looked like full index search was used).
Also, that statement is due to be removed from a future version of SQL Server.
Just sayin.] To update the statistics for all indexes on all tables in your SQL Azure database you can run the following: The real question you should be asking yourself now is: “Self, when would I want to be manually updating statistics, since SQL Azure should be doing that for me automatically anyway? Here are the most common reasons for why you would want to manually update statistics. When queries suddenly start running slowly for no specific reason This is usually the first thing that most DBAs will do when queries start taking longer than expected.
If you check the list of supported statements in SQL Azure you will see that there are a handful of useful commands specific for statistics (CREATE, UPDATE, DBCC SHOW_STATISTICS).