MySQL Reference Manual for version 4.0.18.

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7.2.3 Speed of SELECT Queries

In general, when you want to make a slow SELECT ... WHERE faster, the first thing to check is whether you can add an index. See section MySQL indexes. All references between different tables should usually be done with indexes. You can use the EXPLAIN command to determine which indexes are used for a SELECT. See section EXPLAIN.

Some general tips:



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