mirror of
https://github.com/major/MySQLTuner-perl.git
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425 lines
14 KiB
Markdown
425 lines
14 KiB
Markdown
## MySQLTuner Internals
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[!["Buy Us A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/jmrenouard)
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## Table of contents
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- [MySQLTuner Internals](#mysqltuner-internals)
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- [Table of contents](#table-of-contents)
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- [MySQLTuner steps](#mysqltuner-steps)
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- [MySQLTuner get login information steps](#mysqltuner-get-login-information-steps)
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- [MySQLTuner system checks](#mysqltuner-system-checks)
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- [MySQLTuner Server version checks](#mysqltuner-server-version-checks)
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- [Mysql error log file analysis](#mysql-error-log-file-analysis)
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- [MySQL Storage engine general information](#mysql-storage-engine-general-information)
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- [MySQLTuner security checks](#mysqltuner-security-checks)
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- [MySQLTuner CVE vulnerabilities detection](#mysqltuner-cve-vulnerabilities-detection)
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- [MySQLTuner database information](#mysqltuner-database-information)
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- [MySQLTuner index information](#mysqltuner-index-information)
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- [MySQLTuner Connections information](#mysqltuner-connections-information)
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- [MySQLTuner server information](#mysqltuner-server-information)
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- [MySQLTuner sort, join and temp table information](#mysqltuner-sort-join-and-temp-table-information)
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- [MySQLTuner global buffer information](#mysqltuner-global-buffer-information)
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- [MySQLTuner query cache checks](#mysqltuner-query-cache-checks)
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- [MySQLTuner memory checks](#mysqltuner-memory-checks)
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- [MySQLTuner slow queries checks](#mysqltuner-slow-queries-checks)
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- [MySQLTuner replication checks](#mysqltuner-replication-checks)
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- [MySQLTuner InnoDB information](#mysqltuner-innodb-information)
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- [MySQLTuner ARIADB information](#mysqltuner-ariadb-information)
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- [MySQLTuner MYISAM information](#mysqltuner-myisam-information)
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- [MySQLTuner Galera information](#mysqltuner-galera-information)
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- [MySQLTuner TokuDB information](#mysqltuner-tokudb-information)
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- [MySQLTuner XtraDB information](#mysqltuner-xtradb-information)
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- [MySQLTuner Connect information](#mysqltuner-connect-information)
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- [MySQLTuner Spider information](#mysqltuner-spider-information)
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- [MySQLTuner RocksDb information](#mysqltuner-rocksdb-information)
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- [MySQLTuner Thread pool information](#mysqltuner-thread-pool-information)
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- [MySQLTuner performance schema and sysschema information](#mysqltuner-performance-schema-and-sysschema-information)
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## MySQLTuner steps
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* Header Print
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* Get login information
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* Set up some OS variables
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* Toss variables/status into hashes
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* Get information about the tuning connection
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* Check current MySQL version
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* Suggest 64-bit upgrade
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* Analyze mysqld error log file
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* Show enabled storage engines
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* Show informations about databases (option: --dbstat)
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* Show informations about indexes (option: --idxstat)
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* Display some security recommendations
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* Calculate everything we need
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* Print the server stats
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* Print MyISAM stats
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* Print InnoDB stats
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* Print AriaDB stats
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* Print replication info
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* Make recommendations based on stats
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* Close reportfile if needed
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* Dump result if debug is on
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## MySQLTuner get login information steps
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* Is a login possible?
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* Force socket?
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* Remote connection?
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* _Specifying available RAM is required_
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* Got user/pass on command line?
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* mysql-quickbackup credentials available?
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* Plesk credentials available?
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* DirectAdmin credentials available?
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* Debian maintenance account credentials available?
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* Just try a login
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* If working, and .my.cnf isn't there, **WARNING**
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* If working, and .my.cnf is there, okay
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* Prompt for creds on the console
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## MySQLTuner system checks
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* Check whether more than 2GB RAM present if on 32-bit OS
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* Check number of opened ports (warn when more than 9 ports opened)
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* Check 80, 8080, 443 and 8443 ports if warning is raised if they are opened
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* Check if some banned ports are not opened (option --bannedports separated by comma)
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* Check if non kernel and user process except mysqld are not using more than 15% of total physical memory
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* Check vm.swapiness
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* Check /etc/security/limit.conf
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* Check sysctl entries: sunrpc.tcp_slot_entries, vm.swappiness, fs.aio-fs-nr
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* Check mount point
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* Check Ethernet card
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* Check load average
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## MySQLTuner Server version checks
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* EOL MySQL version check
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* Currently MySQL < 5.1 are considered EOL
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* Using 5.5+ version of MySQL for performance issue (asynchronous IO)
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## Mysql error log file analysis
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* Look for potential current error log file name
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* Check permission on error log file
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* Check size on error log file
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* Check error and warning on error log file
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* Find last start and shutdown on error log file
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## MySQL Storage engine general information
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* Get storage engine counts/stats
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* Check for DB engines that are enabled but unused
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* Look for fragmented tables
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* Look for auto-increments near capacity
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* Look for tables with auto-increment with value near max capacity
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## MySQLTuner security checks
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* Is anonymous user present?
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* Users without passwords
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* Users with username as password
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* Users without host restriction
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* Weak password check (possibly using cracklib later?)
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* Using basic_passwords.txt as password database
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* Password list checks can be avoided (option: --skippassword)
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## MySQLTuner CVE vulnerabilities detection
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* option: --cvefile
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* Check if your MariaDB or MySQL version contains CVE entries.
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## MySQLTuner database information
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* Performance analysis parameter checks
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* Per database information
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* Tables number
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* Rows number
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* Total size
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* Data size
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* Percentage of data size
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* Index size
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* Percentage of index size
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* Collation number
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* Check that there is only one collation for all tables in database
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* Check that there is only one collation for all table columns in database
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* Check that there is only one storage engine per user database
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## MySQLTuner index information
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* Top 10 worth selectivity index
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* Per index information
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* Index Cardinality
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* Index Selectivity
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* Misc information about index definition
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* Misc information about index size
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## MySQLTuner Connections information
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* Highest usage of available connections
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* Percentage of used connections (<85%)
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* Percentage of aborted connections (<3%)
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## MySQLTuner server information
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* Uptime: whether MySQL started within last 24 hours
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* Bytes received and sent
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* Number of connections
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* Percentage between reads and writes
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* Is binary log activated?
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* Is GTID mode activated?
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## MySQLTuner sort, join and temp table information
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* Max memory temporary table size allowed.
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* Percentage of sort using temporary table (<10%)
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* Number of join performed without using indexes (<250)
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* Percentage of temporary table written on disk (<25%)
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* Thread cache (=4)
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* Thread cache hit ratio (>50%) if thread_handling is different of pools-of-threads
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* Table cache hit ratio (>2°%)
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* Table cache definition should be upper that total number of tables or in autoresizing mode
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* Percentage of open file and open file limit (<85%)
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* Percentage of table locks (<95%)
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* Percentage of binlog cache lock (<90%)
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## MySQLTuner global buffer information
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* Key Buffer
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* Max Tmp Table
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* Per Thread Buffer
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* Read Buffer
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* Read RND Buffer
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* Sort Buffer
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* Thread stack
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* Join Buffer
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* Binlog Cache Buffers size if activated
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## MySQLTuner query cache checks
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* Is Query cache activated?
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* Query Cache Buffers
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* Query Cache DISABLED, ALL REQUEST or ON DEMAND
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* Query Cache Size
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* Query cache hit ratio (cache efficiency)
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## MySQLTuner memory checks
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* Get total RAM/swap
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* Is there enough memory for max connections reached by MySQL?
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* Is there enough memory for max connections allowed by MySQL?
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* Max percentage of memory used (<85%)
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## MySQLTuner slow queries checks
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* Percentage of Slow queries (<5%)
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## MySQLTuner replication checks
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* Is server replication configured as slave?
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* SQL replication thread running?
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* IO replication thread running?
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* Replication lag in seconds (Seconds_behind_master)
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* Is Slave configured in read only?
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* Replication type ROW, MIX, STMT
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* Replication Semisync master
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* Replication Semisync slave
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* XA support activated
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* Replication started?
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## MySQLTuner InnoDB information
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* InnoDB Buffer Pool Size
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* If possible, innodb_buffer_pool_size should be greater than data and index size for Innodb Table
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* Innodb_buffer_pool_size should be around 75% to 80% of the available system memory.
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* InnoDB Buffer Pool Instances
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* MySQL needs 1 instance per 1Go of Buffer Pool
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* innodb_buffer_pool instances = round(innodb_buffer_pool_size / 1Go)
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* innodb_buffer_pool instances must be equal to or lower than 64
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- A bug in MySQL 5.6 causes SHOW VARIABLES to report an innodb_buffer_pool_instances value of 8 when innodb_buffer_pool_size is less than 1GB and only one buffer pool instance is present (Bug #18343670).
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* InnoDB Buffer Pool Usage
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* If more than 20% of InnoDB buffer pool is not used, raise an alert.
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* InnoDB Buffer Pool Log Size
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* InnoDB total log file size should be 25% of innodb_buffer_pool_size
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* InnoDB Read efficiency
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* Ratio of read without locks
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* InnoDB Write efficiency
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* Ratio of write without locks
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* InnoDB Log Waits
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* Checks that no lock is used on Innodb Log.
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* InnoDB Chunk Size
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* Check InnoDB Buffer Pool size is a multiple of InnoDB Buffer Pool chunk size * InnoDB Buffer Pool instances
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## MySQLTuner AriaDB information
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* Is Aria indexes size greater than page cache size?
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* Page cache read hit ratio (>95%)
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* Page cache write hit ratio (>95%)
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## MySQLTuner MyISAM information
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* Key buffer usage (>90%)
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* Is MyISAM indexes size is greater than key buffer size ?
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* Key buffer read hit ratio (>95%)
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* Key buffer write hit ratio (>95%)
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## MySQLTuner Galera information
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* wsrep_ready cluster is ready
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* wsrep_connected node is connected to other nodes
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* wsrep_cluster_name is defined.
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* wsrep_node_name is defined.
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* Check thet notification script wsrep_notify_cmd is defined
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* wsrep_cluster_status PRIMARY /NON PRIMARY.
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* PRIMARY : Coherent cluster
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* NO PRIMARY : cluster gets several states
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* wsrep_ local_state_comment: Node state
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* SYNCED (uptodate),
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* DONOR (sending information to another node)
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* Joiner (try to reach cluster group)
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* SYNCED state able to read/write
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* wsrep_cluster_conf_id configuration level must be identical in all nodes
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* wsrep_slave_thread is between 3 or 4 times number of CPU core.
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* gcs.limit should be equal to wsrep_slave_threads * 5
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* gcs.fc_factor should be equal to 0.8
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* Flow control fraction should be lower than 0.02 (wsrep_flow_control_paused < 0.02)
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* wsrep_last_commited committed level must be identical in all nodes
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* Look for tables without primary keys
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* Look for non InnoDB tables for Galera
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* Variable innodb_flush_log_at_trx_commit should be set to 0.
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* Check that there are 3 or 5 members in Galera cluster.
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* Check that xtrabackup is used for SST method with wsrep_sst_method variable.
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* Check variables wsrep_OSU_method is defined to TOI for updates.
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* Check that there is no certification failures controlling wsrep_local_cert_failures status.
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## MySQLTuner TokuDB information
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* tokudb_cache_size
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* tokudb_directio
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* tokudb_empty_scan
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* tokudb_read_block_size
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* tokudb_commit_sync
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* tokudb_checkpointing_period
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* tokudb_block_size
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* tokudb_cleaner_iterations
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* tokudb_fanout
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## MySQLTuner XtraDB information
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* Not implemented
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## MySQLTuner Connect information
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* Not implemented
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## MySQLTuner Spider information
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* Not implemented
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## MySQLTuner RocksDb information
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* Not implemented
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## MySQLTuner Thread pool information
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* thread_pool_size between 16 to 36 for Innodb usage
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* thread_pool_size between 4 to 8 for MyISAM usage
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## MySQLTuner performance schema and sysschema information
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* Check that Performance schema is activated for 5.6+ version
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* Check that Performance schema is deactivated for 5.5- version
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* Check that Sys schema is installed
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* Sys Schema version
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* Top user per connection
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* Top user per statement
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* Top user per statement latency
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* Top user per lock latency
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* Top user per full scans
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* Top user per row_sent
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* Top user per row modified
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* Top user per io
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* Top user per io latency
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* Top host per connection
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* Top host per statement
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* Top host per statement latency
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* Top host per lock latency
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* Top host per full scans
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* Top host per rows sent
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* Top host per rows modified
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* Top host per io
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* Top 5 host per io latency
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* Top IO type order by total io
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* Top IO type order by total latency
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* Top IO type order by max latency
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* Top Stages order by total io
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* Top Stages order by total latency
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* Top Stages order by avg latency
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* Top host per table scans
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* InnoDB Buffer Pool by schema
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* InnoDB Buffer Pool by table
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* Process per allocated memory
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* InnoDB Lock Waits
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* Threads IO Latency
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* High Cost SQL statements
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* Top 5% slower queries
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* Top 10 nb statement type
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* Top statement by total latency
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* Top statement by lock latency
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* Top statement by full scans
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* Top statement by rows sent
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* Top statement by rows modified
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* Use temporary tables
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* Unused Indexes
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* Full table scans
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* Latest file IO by latency
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* File by IO read bytes
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* File by IO written bytes
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* File per IO total latency
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* File per IO read latency
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* File per IO write latency
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* Event Wait by read bytes
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* Event Wait by write bytes
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* Event per wait total latency
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* Event per wait read latency
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* Event per wait write latency
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* Top 15 most read indexes
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* Top 15 most modified indexes
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* Top 15 high select latency index
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* Top 15 high insert latency index
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* Top 15 high update latency index
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* Top 15 high delete latency index
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* Top 15 most read tables
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* Top 15 most modified tables
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* Top 15 high select latency tables
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* Top 15 high insert latency tables
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* Top 15 high update latency tables
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* Top 15 high delete latency tables
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* Redundant indexes
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* Tables not using InnoDb buffer
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* Top 15 Tables using InnoDb buffer
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* Top 15 Tables with InnoDb buffer free
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* Top 15 Most executed queries
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* Latest SQL queries in errors or warnings
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* Top 20 queries with full table scans
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* Top 15 reader queries (95% percentile)
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* Top 15 row look queries (95% percentile)
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* Top 15 total latency queries (95% percentile)
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* Top 15 max latency queries (95% percentile)
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* Top 15 average latency queries (95% percentile)
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* Top 20 queries with sort
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* Last 50 queries with sort
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* Top 15 row sorting queries with sort
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* Top 15 total latency queries with sort
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* Top 15 merge queries with sort
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* Top 15 average sort merges queries with sort
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* Top 15 scans queries with sort
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* Top 15 range queries with sort
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* Top 20 queries with temp table
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* Last 50 queries with temp table
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* Top 15 total latency queries with temp table
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* Top 15 queries with temp table to disk
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* Top 15 class events by number
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* Top 30 events by number
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* Top 15 class events by total latency
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* Top 30 events by total latency
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* Top 15 class events by max latency
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* Top 30 events by max latency
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