Hi!
At 05:44 PM 6/1/01 +0400, you wrote:
>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.
The speed 1000 rows per second is really too little. I tried an
InnoDB table with 1 000 000 rows, with 2 integer columns, on the
first column a primary key.
mysql> select * from t25 into outfile 'testout2';
Query OK, 1000000 rows affected (4.47 sec)
mysql> load data infile 'testout2' into table t30;
Query OK, 1000000 rows affected (22.23 sec)
Records: 1000000 Deleted: 0 Skipped: 0 Warnings: 0
Thus for these small rows it is 45 000 rows/second on Linux-2.4
2-CPU Xeon 450 Mhz.
What is your table definition like? What is the OS and file system?
Regards,
Heikki
>--
>Best regards,
> Peter mailto:[EMAIL PROTECTED]
>
>
---------------------------------------------------------------------
Before posting, please check:
http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
