show full processlist;
mysql -h hostname.com -u user -p dbname --execute="select DISTINCT(column_name) from tablename" > file.txt
Get current timezone:
SELECT @@global.time_zone;
Set new timezone:
SET GLOBAL time_zone = 'Europe/Helsinki';
Download the mysqltuner script from github:
wget http://github.com/major/MySQLTuner-perl/archive/master.zip
Unzip the file and then run the perl script:
perl mysqltuner.pl
This will give an out put similar to the below which includes recommendations at the end:
Use of implicit split to @_ is deprecated at mysqltuner.pl line 3243 (#1)
(D deprecated) It makes a lot of work for the compiler when you clobber
a subroutine's argument list, so it's better if you assign the results
of a split() explicitly to an array (or list).
>> MySQLTuner 1.6.12 - Major Hayden <major@mhtx.net>
>> Bug reports, feature requests, and downloads at http://mysqltuner.com/
>> Run with '--help' for additional options and output filtering
[OK] Logged in using credentials.
[--] Skipped version check for MySQLTuner script
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
[!!] Your MySQL version 5.0.32-Debian_7etch6-log is EOL software! Upgrade soon!
[OK] Operating on 32-bit architecture with less than 2GB RAM
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Archive -BDB +Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 163M (Tables: 105)
[!!] InnoDB is enabled but isn't being used
[!!] Total fragmented tables: 1
-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[!!] No more password checks for MySQL version <=5.1
[!!] MySQL version <=5.1 are deprecated and end of support.
-------- CVE Security Recommendations --------------------------------------------------------------
[!!] CVE-2007-2691 : Candidate
[!!] CVE-2007-2691 : Candidate
[!!] CVE-2007-2692 : Candidate
[!!] CVE-2007-2692 : Candidate
[!!] CVE-2007-3780 : Candidate
[!!] CVE-2007-3781 : Candidate
[!!] CVE-2007-3782 : Candidate
[!!] CVE-2007-5969 : Candidate
[!!] CVE-2007-5969 : Candidate
[!!] CVE-2007-6303 : Candidate
[!!] CVE-2007-6304 : Candidate
[!!] CVE-2008-3963 : Candidate
[!!] CVE-2009-4028 : Candidate
[!!] CVE-2009-4484 : Candidate
[!!] CVE-2009-4484 : Candidate
[!!] CVE-2009-5026 : Candidate
[!!] CVE-2010-3833 : Candidate
[!!] CVE-2010-3834 : Candidate
[!!] CVE-2010-3836 : Candidate
[!!] CVE-2010-3837 : Candidate
[!!] CVE-2010-3838 : Candidate
[!!] 21 CVE(s) found for your MySQL release.
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 124d 23h 19m 23s (51M q [4.761 qps], 91K conn, TX: 478M, RX: 2G)
[--] Reads / Writes: 98% / 2%
[--] Binary logging is enabled (GTID MODE: OFF)
[--] Physical Memory : 2.0G
[--] Max MySQL memory : 320.5M
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
[--] Other process memory: 68.1M
[--] Total buffers: 58.0M global + 2.6M per thread (100 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 207.6M (10.26% of installed RAM)
[OK] Maximum possible memory usage: 320.5M (15.84% of installed RAM)
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (8/51M)
[OK] Highest usage of available connections: 56% (57/100)
[OK] Aborted connections: 0.00% (1/91441)
[OK] Query cache efficiency: 66.0% (33M cached / 51M selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 8M sorts)
[OK] No joins without indexes
[OK] Temporary tables created on disk: 17% (10K on disk / 60K total)
[!!] Table cache hit rate: 0% (64 open / 6K opened)
[OK] Open file limit used: 12% (130/1K)
[OK] Table locks acquired immediately: 99% (17M immediate / 17M locks)
[OK] Binlog cache memory access: 100.00% ( 1 Memory / 1 Total)
-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is disabled.
-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.
-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 11.8% (1M used / 16M cache)
[OK] Key buffer size / total MyISAM indexes: 16.0M/29.7M
[OK] Read Key buffer hit rate: 100.0% (114M cached / 24K reads)
[!!] Write Key buffer hit rate: 92.6% (2M cached / 164K writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is disabled.
-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is disabled.
-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.
-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] This is a standalone server.
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Add skip-innodb to MySQL configuration to disable InnoDB
Run OPTIMIZE TABLE to defragment tables for better performance
21 CVE(s) found for your MySQL release. Consider upgrading your version !
Enable the slow query log to troubleshoot bad queries
Increase table_cache gradually to avoid file descriptor limits
Read this before increasing table_cache over 64: http://bit.ly/1mi7c4C
Beware that open_files_limit (1024) variable
should be greater than table_cache ( 64)
Upgrade to MySQL 5.5+ to use asynchronous write
Variables to adjust:
table_cache (> 64)
*This was run on a very old development server for testing purposes.
Below are instructions on how to install configure a Percona DB Cluster on Ubuntu (14.04 at time of writing this).
*Carry out on all nodes (servers)
Remove apparmor as it prevents cluster nodes talking to each other:
sudo /etc/init.d/apparmor stop sudo update-rc.d -f apparmor remove sudo apt-get remove apparmor apparmor-utils -y
Disable SELinux by editing /etc/selinux/config and add/alter line to disable it:
SELINUX=disabled
Add the following keys to the repository:
apt-key adv –keyserver keys.gnupg.net –recv-keys 1C4CBDCDCD2EFD2A
Add Percona sources:
vim /etc/apt/sources.list deb http://repo.percona.com/apt trusty main deb-src http://repo.percona.com/apt trusty main
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