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I trying to use command Explain to obtain the query time of my mySql database, however it return always 0.00sec, am i misunderstand the Explain command usage in mySql?
Below is my command:
mysql> explain select * from table;
0.00 sec
mysql> select * from table;
15 sec
why the explain wouldn’t return the same query time result as i using the same command?
Pls help
Because Explain is completely different.
It never runs a query. But just tells how it would be run.