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Revision as of 18:41, 15 January 2009

Attention.png - This article is NOT official Zimbra documentation. It is a user contribution and may include unsupported customizations, references, suggestions, or information.

Mysql

Actual Mysql Topics Homepage

Please see Ajcody-Mysql-Topics

Mysql Issues And Memory Usuage

My Ajcody-General-Notes#Trouble_Shooting_Memory_Issues has some stuff on memory troubleshooting - generalities.

Our performance guide for Mysql:

http://wiki.zimbra.com/index.php?title=Performance_Tuning_Guidelines_for_Large_Deployments#MySQL

Variable Within MySQL & Zimbra

These percentages below are used against physical RAM - disregard swap in the percentage division.

From the above url, we get some details.

"By default, we try to reserve 30% of system memory for use by this process, and 40% for use by MySQL."
# ZCS 5.0 and later
$ zmlocalconfig -e mailboxd_java_heap_memory_percent=40
Java - mailboxd_java_heap_memory_percent=

The command to set the java percentage is:

 zmlocalconfig -e mailboxd_java_heap_memory_percent=30
Mysql - mysql_memory_percent & my.cnf w/ innodb_buffer_pool_size

Looks like there's an issue with the command/variable (zmlocalconfig -e mysql_memory_percent=##) in regards to MySQL though.

"There is a local config variable [mysql_memory_percent] for mysql memory percent, but today my.cnf doesn't get rewritten after install, so you have to edit my.cnf for this setting if you want to change it."

In summary, this variable [ mysql_memory_percent ] for MySQL is basically not working.

Do this to get memory in bytes for division numbers:

free -b

Figure out what your % in bytes using the physical memory (Mem:) output. Now edit the /opt/zimbra/conf/my.cnf file to change the following line with your memory percentage in bytes:

vi /opt/zimbra/conf/my.cnf
#Modify this var to adjust memory usage
innodb_buffer_pool_size = xxx

This will require a restart.

A GREAT forum post on this is here:

So other background info:

Mysql And Swap

See this article first before exploring the options below.

Should you have your swap file enabled while running MySQL ?

Set swappiness Kernel Var To 0

Source of this summary is here: [http://www.mysqlperformanceblog.com/2007/09/28/heikki-tuuri-to-answer-your-in-depth-innodb-questions/#comment-174442 Swappiness To 0"

Set it on running box:

echo 0 > /proc/sys/vm/swappiness

Set it to persist after reboot - vi /etc/sysctl.conf :

vm.swappiness = 0

The value is a percentage. By setting it to 100, Linux will always swap programs out and never shrink the buffer cache.

Swap Ram Disk Instead Of Disk

Source of this summary is here:

MySQL and the Linux swap problem

Make a (or some) swap disks:

mkdir /mnt/ram0
dd bs=1024 count=14634 if=/dev/zero of=/mnt/ram0/swapfile
mkswap /mnt/ram0/swapfile
swapon /mnt/ram0/swapfile

Will look like this:

[root@mail3 ~]# mkdir /mnt/ram0

[root@mail3 ~]# dd bs=1024 count=14634 if=/dev/zero of=/mnt/ram0/swapfile
14634+0 records in
14634+0 records out
14985216 bytes (15 MB) copied, 0.246329 seconds, 60.8 MB/s

[root@mail3 ~]# mkswap /mnt/ram0/swapfile 
Setting up swapspace version 1, size = 14979 kB

[root@mail3 ~]# free
             total       used       free     shared    buffers     cached
Mem:       1555472    1461200      94272          0     159400     344328
-/+ buffers/cache:     957472     598000
Swap:      2031608        104    2031504

[root@mail3 ~]# swapon /mnt/ram0/swapfile 

[root@mail3 ~]# free
             total       used       free     shared    buffers     cached
Mem:       1555472    1476252      79220          0     159404     344376
-/+ buffers/cache:     972472     583000
Swap:      2046232        104    2046128

[root@mail3 ~]# swapon -s
Filename				Type		Size	Used	Priority
/dev/mapper/VolGroup00-LogVol01         partition	2031608	104	-1
/mnt/ram0/swapfile 
                     file		14624	0	-2
[root@mail3 ~]# cat /proc/swaps 
Filename				Type		Size	Used	Priority
/dev/mapper/VolGroup00-LogVol01         partition	2031608	104	-1
/mnt/ram0/swapfile                      file		14624	0	-2


Just add those lines to your relevant startup file, like /etc/rc.d/rc.local, and it’ll persist after reboots. </pre>

O_DIRECT On Linux And INNODB To Fix Swapping

Source reference for this part is here:

Using O_DIRECT on Linux and INNODB to Fix Swap Insanity

See also: Ajcody-Mysql-Topics#IO_DIRECT_And_Ext3_On_Linux_As_Possible_Reason_For_Corruption

IO_DIRECT And Ext3 On Linux As Possible Reason For Corruption

This is being investigated. Below are my notes on the issue.

Mysql Database Corruption/Repair

Please see the Mysql_Crash_Recovery page rather than the normal search results that give mysql-logger details.

Manual Change Of Mysql Passwords

Please see:

http://wiki.zimbra.com/index.php?title=Issues_with_mysql_and_logmysql_passwords

Working Within Mysql For Accounts

Basic Query Of Information For Account In Mysql

Each user is referenced by a unique mailboxId within Mysql. Each mailstore has it's own Mysql database and therefore the user mailboxId's are only locally unique - i.e., the id isn't a unique global variable.
Zmprov And Mailbox ID

To get a users mailboxId on there mailstore server:

zmprov gmi USER@DOMAIN.com

Example output:

$ zmprov gmi ajcody@zimbra.DOMAIN.com
mailboxId: 3
quotaUsed: 35912
Queries Against Mysql For User Information
By mailboxId

You'll need to know the mailboxId for the user for this. [ zmprov gmi USER@DOMAIN.com ]

Format:

$ mysql -e 'SELECT * FROM zimbra.mailbox WHERE id=<mailboxID of USER>\G'

Working example:

 $ mysql -e 'SELECT * FROM zimbra.mailbox WHERE id=3\G'

 *************************** 1. row ***************************
                 id: 3
           group_id: 3
         account_id: 3be48432-926c-4a54-bd66-3b16185a37a4
    index_volume_id: 2
 item_id_checkpoint: 339
      contact_count: 5
    size_checkpoint: 35912
  change_checkpoint: 7200
      tracking_sync: 0
      tracking_imap: 0
     last_backup_at: 1231567229
            comment: ajcody@zimbra.DOMAIN.com
   last_soap_access: 1229584283
       new_messages: 1
 idx_deferred_count: 0
By zimbraId

You'll need to know the zimbraId for the user for this.

Format:

$ mysql -e 'SELECT * FROM zimbra.mailbox WHERE account_id=<zimbraID of USER>\G'

Working example:

 $ mysql -e 'SELECT * FROM zimbra.mailbox WHERE account_id="3be48432-926c-4a54-bd66-3b16185a37a4"\G'

 *************************** 1. row ***************************
                 id: 3
           group_id: 3
         account_id: 3be48432-926c-4a54-bd66-3b16185a37a4
    index_volume_id: 2
 item_id_checkpoint: 339
      contact_count: 5
    size_checkpoint: 35912
  change_checkpoint: 7200
      tracking_sync: 0
      tracking_imap: 0
     last_backup_at: 1231567229
            comment: ajcody@zimbra.DOMAIN.com
   last_soap_access: 1229584283
       new_messages: 1
 idx_deferred_count: 0
By Comment Field - I.E. Username

This way searches against the "comment field". The comment field is mostly correct, but it is deemed unreliable since there are some corner cases where it can be duplicated. Use it in a pinch.

Format:

$ mysql -e 'SELECT * FROM zimbra.mailbox WHERE comment LIKE "<USER>%"\G'

Working example:

 $ mysql -e 'SELECT * FROM zimbra.mailbox WHERE comment LIKE "ajcody%"\G'

 *************************** 1. row ***************************
                 id: 3
           group_id: 3
         account_id: 3be48432-926c-4a54-bd66-3b16185a37a4
    index_volume_id: 2
 item_id_checkpoint: 339
      contact_count: 5
    size_checkpoint: 35912
  change_checkpoint: 7200
      tracking_sync: 0
      tracking_imap: 0
     last_backup_at: 1231567229
            comment: ajcody@zimbra.DOMAIN.com
   last_soap_access: 1229584283
       new_messages: 1
  idx_deferred_count: 0
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