-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ledet, Mike wrote: | I'm running Mysql 3.23.52 on a Redhat 8.0 installation booting to Gnome. | The machine is a dual AMD 1800, 1 gig of ram, one Ultra ATA IDE drive, and 2 | 18 gig scsi 10,000 RPM drives on a RAID controller running Raid 0. | | I've got everything except /db on the IDE drive, /db is the only thing on | the raid array. | | I've got a couple of smallish tables and one larger table with about 7 gigs | of data. The larger table is a fixed row format table with each row being | 462 bytes wide. I have a primary auto increment int column and a unique | index on a varchar 60. Pack keys is off, delayed key writes on. |
I'm afraid, you table row isn't fixed-length row, as far as you'll be using varchar your rows will not be considered to be a fixed length rows. try to change it to char(60) (BINARY if you don't care for U/L case) this may help. it will be more helpful if you provide table structure for us... I have table with approx 6M rows with fixed length, used for site statistics with approx. ++250k rows/day. There are extensive writes (UPDATE DELAYED) and minor reads and I'm not having problems... As for my config its 2x 1GHz PIII + 1GB RAM + 2 channel onboard SCSI on 64-bit PCI WITHOUT RAID, 2x 16GB 10,000 RPM SCSI-HDD one disc is used for db data only. As for RAID 0 it is not very good idea to have databases stored in that manner (safety - if one disk fails, you will lost everything ...). | With this kind of hardware I was expecting pretty good performance, but I | haven't seen it yet. I finally decided something was wrong when I had to | run an alter table on the 7 gig table, adding 3 columns, a varchar 12, a | varchar 50, and a datetime columm.... and it took over 10 HOURS to complete. | As I wrote, to keep table fixed-length you must not use varchar. As for datetime I'm using UNSIGNED int(11) and unix_timestamp to store date and time. | That seems way too slow to me... | | I've included relevant portions (the uncommented portions) from my.cnf, the | OS installation was fairly vanilla, using defaults for just about | everything. The file system is ext3. ext-3 is so-called journaling file system. it has small performance slow-down (no flame, please ;-)) | | Any suggestions or things I haven't included that you need? Sorry if I'm | doing something really stupid here... relatively new to Linux after a lot of | years of windoze. everyone had been newbie. Keep trying :) TIPS: - check settings for your RAID controller - are you using native driver for SCSI/RAID controller ? # of TCQ (tagged commands queuing) elevator sorting - should be ON - do you really need ext3? - rethink structure of your table (R. M. Ryordan Designing relational database, ISBN:073560634X - it is MS oriented, but theoretical parts are very good and helpful for any platform) | | Thanks in advance | | Mike - -- Mirek Novak Anima Publishers, s.r.o. Prilucka 360, Zlin 760 01 Czech Republic tel/fax: 067/721 91 32 jabber:[EMAIL PROTECTED] ICQ:119499448 GSM:+420603807837 AUTO.CZ http://www.auto.cz NEWS.AUTO.CZ http://news.auto.cz FORMULE1.CZ http://www.formule1.cz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAj3vJNoACgkQz+tW1WzgrpSjSACcD1R30nPOyUUgjmg//61aQaBX ltsAmwTEHf+A3eZo5kNKnF6F+qJs8Keb =53Lx -----END PGP SIGNATURE----- --------------------------------------------------------------------- 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
