Hi,
There might be some kind of bug in UPDATE. Let's say there is a 40000 row
table, which looks like this:
| fd_01 | int(11) unsigned | | PRI | 0 | |
| fd_02 | text | | | | |
| fd_03 | varchar(4) | | | | |
...
| fd_10 | varchar(20) | | MUL | | |
| fd_11 | varchar(20) | | | | |
and indexes are:
| test | 0 | PRIMARY | 1 | fd_01 | A |
40934 | NULL | NULL | |
| test | 1 | fd_10 | 1 | fd_10 | A |
40934 | NULL | NULL | |
Now when I do this update:
UPDATE test SET fd_11='value' WHERE fd_10='some_value'
it usually executes in 0.00 sec
But when the query looks like this:
UPDATE test SET fd_11='value' WHERE fd_10=some_value
It takes about 2 seconds to execute.
Tested on MySQL 3.23.36 / FreeBSD 4.2 (i386)
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