MySQL索引下推技术
发布时间:2016-02-18 11:00:06
索引下推整个思路如下:To see how this optimization works, consider first how an index scan proceeds when Index Condition Pushdown is not used:Get the n ...
索引下推整个思路如下:
To see how this optimization works, consider first how an index scan proceeds when Index Condition Pushdown is not used:
Get the next row, first by reading the index tuple, and then by using the index tuple to locate and read the full table row.
Test the part of the WHERE
condition that applies to this table. Accept or reject the row based on the test result.
原标题:MySQL索引下推技术
关键词:MYSQL
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