SQL As Understood By SQLite
[Contents]
ANALYZE
sql-statement ::= |
ANALYZE |
sql-statement ::= |
ANALYZE database-name |
sql-statement ::= |
ANALYZE [database-name .] table-name |
The ANALYZE command gathers statistics about indices and stores them
in a special tables in the database where the query optimizer can use
them to help make better index choices.
If no arguments are given, all indices in all attached databases are
analyzed. If a database name is given as the argument, all indices
in that one database are analyzed. If the argument is a table name,
then only indices associated with that one table are analyzed.
The initial implementation stores all statistics in a single
table named sqlite_stat1. Future enhancements may create
additional tables with the same name pattern except with the "1"
changed to a different digit. The sqlite_stat1 table cannot
be DROPped,
but all the content can be DELETEd which has the
same effect.
This page last modified on 2007/08/09 00:00:26