Hello mysql,
Today I played a little bit with two different ways of backup -
first one is to use BACKUP TABLE (which works for myisam only) and
the second one is SAVE DATA/LOAD DATA.
In both cases if I'm not mistaken the file is wrote by mysqld server
so there is no communication overhead.
The table was about 3mil of rows 250MB in size, has 2 indexes.
So the speeds are:
BACKUP TABLE:
backup: 26sec restore: 3min.15sec
SAVE DATA/LOAD DATA
dump: 4.5min restore: 40min
Then I tried to drop all indexes from the table and tried to do
restore again it went in: 31min
The output from backup was 250MB, save file - 400MB.
These speeds was really strange for me, I did't expect so huge
difference in speads, as I don't see there it should get from. The
save data outfile operation should be quite fast as the speed of
text parsing should be the real limit, also the really surprising
was so slow speed of import data from text, even with no indexes on
the table if we would look at the speed it's only about 1000 rows
per second which is quite slow.
--
Best regards,
Peter mailto:[EMAIL PROTECTED]
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