hhf/MySQLTuner-perl
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
MySQLTuner-perl/INTERNALS.md
Peter 'Pessoft' Kolínek b5d1650f59 add general recommendation for innodb log file changes 
add information to INTERNALS.md about innodb log file to buffer pool ratio
fix buffer pool typos in comments
fix code formatting a bit
2017-09-09 13:22:30 +02:00

14 KiB
Raw Blame History

MySQLTuner Internals

Table of contents

MySQLTuner steps

  • Header Print
  • Get login information
  • Set up some OS variables
  • Toss variables/status into hashes
  • Get information about the tuning connexion
  • Check current MySQL version
  • Suggest 64-bit upgrade
  • Show enabled storage engines
  • Show informations about databases (option: --dbstat)
  • Show informations about indexes (option: --idxstat)
  • Display some security recommendations
  • Calculate everything we need
  • Print the server stats
  • Print MyISAM stats
  • Print InnoDB stats
  • Print AriaDB stats
  • Print replication info
  • Make recommendations based on stats
  • Close reportfile if needed
  • Dump result if debug is on

MySQLTuner get login information steps

  • Is a login possible?
    • Force socket?
    • Remote connection?
      • Specifying available RAM is required
    • Got user/pass on command line?
    • mysql-quickbackup credentials available?
    • Plesk credentials available?
    • DirectAdmin credentials available?
    • Debian maintenance account credentials available?
    • Just try a login
      • If working, and .my.cnf isn't there, WARNING
      • If working, and .my.cnf is there, okay
    • Prompt for creds on the console

MySQLTuner system checks

  • 32-bit w/>2GB RAM check
  • Check number of opened ports (warning if more than 9 ports opened)
  • Check 80, 8080, 443 and 8443 ports if warning are raised if there are opened
  • Check if some banned ports are not opened (option --bannedports separated by comma)
  • Check if non kernel and user process except mysqld are not using more than 15% of total physical memory)
  • Check vm.swapiness
  • Check /etc/security/limit.conf
  • Check sysctl entries: sunrpc.tcp_slot_entries, vm.swappiness, fs.aio-fs-nr
  • Check mount point
  • Check Ethernet card
  • Check load average

MySQLTuner Server version checks

  • EOL MySQL version check
  • Currently MySQL < 5.1 are EOF considerated.
  • Using 5.5+ version of MySQL for performance issue (asynchronous IO).

MySQL Storage engine general information

  • Get storage engine counts/stats
    • Check for DB engines that are enabled but unused
    • Look for fragmented tables
    • Look for auto-increments near capacity
      • Look for table with autoincrement with value near max capacity

MySQLTuner security checks

  • Is anonymous user present?
  • Users without passwords
  • Users w/username as password
  • Users w/o host restriction
  • Weak password check (possibly using cracklib later?)
  • Using basic_passwords.txt as password database
  • Password list checks can be avoid (option: --skippassword)

MySQLTuner CVE vulnerabilities detection

  • option: --cvefile
  • Check if your MariaDB or MySQL version contains CVE bulletins.

MySQLTuner database information

  • Per database information * Tables number
    • Rows number
    • Total size
    • Data size
    • Percentage of data size
    • Index size
    • Percentage of index size
      • Collation number
      • Check that there is only one collation for all table in a database
      • Check that there is only one collation for ll table columns in a database
      • Check that there is only one storage engine per user database

MySQLTuner index information

  • Top 10 worth selectivity index
  • Per index information
    • Index Cardinality
    • Index Selectivity
    • Misc information about index definition
    • Misc information about index size

MySQLTuner Connections information

  • Highest usage of available connections
  • Percentage of used connections (<85%)
  • Percentage of aborted connections (<3%)

MySQLTuner server information

  • Uptime: If MySQL started within last 24 hours
  • Bytes received and sent
  • Number of connections
  • Percentage between reads and writes
  • Is binary log activated ?
    • Is GTID mode activated ?

MySQLTuner sort, join and temp table information

  • Max memory temporary table size allowed.
  • Percentage of sort using temporary table (<10%)
  • Number of join performed without using indexes (<250)
  • Percentage of temporary table written on disk(<25%)
  • Thread cache (=4)
  • Thread cache hit ratio (>50%) if thread_handling is different of pools-of-threads
  • Table cache hit ratio(>2°%)
  • Percentage of open file and open file limit(<85%)
  • Percentage of table locks (<95%)
  • Percentage of binlog cache lock (<90%)

MySQLTuner global buffer information

  • Key Buffer
  • Max Tmp Table
  • Per Thread Buffer
    • Read Buffer
    • Read RND Buffer
    • Sort Buffer
    • Thread stack
    • Join Buffer
    • Binlog Cache Buffers size if activated

MySQLTuner query cache checks

  • Is Query cache activated ?
    • Query Cache Buffers
    • Query Cache DISABLED, ALL REQUEST or ON DEMAND
    • Query Cache Size
    • Query cache hit ratio (cache efficienty)

MySQLTuner memory checks

  • Get total RAM/swap
  • Is there enough memory for max connections reached by MySQL ?
  • Is there enough memory for max connections allowed by MySQL ?
  • Max percentage of memory used(<85%)

MySQLTuner slow queries checks

  • Percentage of Slow queries (<5%)

MySQLTuner replication checks

  • Is server replication configuarted as slave ?
  • SQL replacation thread running ?
  • IO replacation thread running ?
  • Replication lag in seconds
  • Is Slave configuratedd in read only ?

MySQLTuner InnoDB information

  • InnoDB Buffer Pool Size
    • If possible, innodb_buffer_pool_size should be greater data and index size for Innodb Table
    • Innodb_buffer_pool_size should around 75 to 80 % of the available system memory.
  • InnoDB Buffer Pool Instances
    • MySQL needs 1 instanes per 1Go of Buffer Pool
    • innodb_buffer_pool instances = round(innodb_buffer_pool_size / 1Go)
    • innodb_buffer_pool instances must be equals or lower than 64
  • InnoDB Buffer Pool Usage
    • If more than 20% of InnoDB buffer pool is not used, MySQLTuner raise an alert.
  • InnoDB Buffer Pool Log Size
    • InnoDB total log file size should be 25% of innodb_buffer_pool_size
  • InnoDB Read effiency
    • Ratio of read without locks
  • InnoDB Write effiency
    • Ratio of write without locks
  • InnoDB Log Waits
    • Checks that no lock is used on Innodb Log.
  • InnoDB Chunk Size
    • Check InnoDB Buffer Pool size is a multiple of InnoDB Buffer Pool chunk size * InnoDB Buffer Pool instances

MySQLTuner ARIADB information

  • Is Aria indexes size is greater than page cache size ?
  • Page cache read hit ratio (>95%)
  • Page cache write hit ratio (>95%)

MySQLTuner MYISAM information

  • Key buffer usage (>90%)
  • Is MyISAM indexes size is greater than key buffer size ?
  • Key buffer read hit ratio (>95%)
  • Key buffer write hit ratio (>95%)

MySQLTuner Galera information

  • wsrep_ready cluster is ready
  • wsrep_connected node is connected to other nodes
  • wsrep_cluster_name is defined.
  • wsrep_node_name is defined.
  • Check thet notification script wsrep_notify_cmd is defined
  • wsrep_cluster_status PRIMARY /NON PRIMARY.
    • PRIMARY : Coherent cluster
    • NO PRIMARY : cluster gets several states
  • wsrep_ local_state_comment: Node state
    • SYNCED (uptodate),
    • DONOR(sending information to another node)
    • Joiner(Try to reach cluster group)
    • SYNCED state able to read/write
  • wsrep_cluster_conf_id configuration level must be identical in all nodes
  • wsrep_slave_thread is between 3 or 4 times number of CPU core.
  • gcs.limit should be equal to wsrep_slave_threads * 5
  • gcs.fc_factor should be equal to 0.8
  • Flow control fraction should be lower than 0.02 (wsrep_flow_control_paused < 0.02)
  • wsrep_last_commited committed level must be identical in all nodes
  • Look for tables without primary keys
  • Look for non InnoDB tables for Galera
  • Variable innodb_flush_log_at_trx_commit should be set to 0.
  • Check that there is 3 or 5 members in Galera cluster.
  • Check that xtrabackup is used for SST method with wsrep_sst_method variable.
  • Check variables wsrep_OSU_method is defined to TOI for updates.
  • Check that there is no certification failures controlling wsrep_local_cert_failures status.

MySQLTuner TokuDB information

  • tokudb_cache_size
  • tokudb_directio
  • tokudb_empty_scan
  • tokudb_read_block_size
  • tokudb_commit_sync
  • tokudb_checkpointing_period
  • tokudb_block_size
  • tokudb_cleaner_iterations
  • tokudb_fanout

MySQLTuner XtraDB information

  • Nothing for the moment

MySQLTuner Connect information

  • Nothing for the moment

MySQLTuner Spider information

  • Nothing for the moment

MySQLTuner RocksDb information

  • Nothing for the moment

MySQLTuner Thread pool information

  • thread_pool_size between 16 to 36 for Innodb usage
  • thread_pool_size between 4 to 8 for MyIsam usage

MySQLTuner performance schema and sysschema information

  • Check that Performance schema is activated for 5.6+ version
  • Check that Performance schema is disactivated for 5.5- version
  • Check that Sys schema is installed
  • sys Schema version
  • Top user per connection
  • Top user per statement
  • Top user per statement latency
  • Top user per lock latency
  • Top user per full scans
  • Top user per row_sent
  • Top user per row modified
  • Top user per io
  • Top user per io latency
  • Top host per connection
  • Top host per statement
  • Top host per statement latency
  • Top host per lock latency
  • Top host per full scans
  • Top host per rows sent
  • Top host per rows modified
  • Top host per io
  • Top 5 host per io latency
  • Top IO type order by total io
  • Top IO type order by total latency
  • Top IO type order by max latency
  • Top Stages order by total io
  • Top Stages order by total latency
  • Top Stages order by avg latency
  • Top host per table scans
  • InnoDB Buffer Pool by schema
  • InnoDB Buffer Pool by table
  • Process per allocated memory
  • InnoDB Lock Waits
  • Threads IO Latency
  • High Cost SQL statements
  • Top 5% slower queries
  • Top 10 nb statement type
  • Top statement by total latency
  • Top statement by lock latency
  • Top statement by full scans
  • Top statement by rows sent
  • Top statement by rows modified
  • Use temporary tables
  • Unused Indexes
  • Full table scans
  • Latest file IO by latency
  • File by IO read bytes
  • File by IO written bytes
  • File per IO total latency
  • File per IO read latency
  • File per IO write latency
  • Event Wait by read bytes
  • Event Wait by write bytes
  • Event per wait total latency
  • Event per wait read latency
  • Event per wait write latency
  • TOP 15 most read indexes
  • TOP 15 most modified indexes
  • TOP 15 high select latency index
  • TOP 15 high insert latency index
  • TOP 15 high update latency index
  • TOP 15 high delete latency index
  • TOP 15 most read tables
  • TOP 15 most modified tables
  • TOP 15 high select latency tables
  • TOP 15 high insert latency tables
  • TOP 15 high update latency tables
  • TOP 15 high delete latency tables
  • Redundant indexes
  • Tables not using InnoDb buffer
  • Top 15 Tables using InnoDb buffer
  • Top 15 Tables with InnoDb buffer free
  • Top 15 Most executed queries
  • Latest SQL queries in errors or warnings
  • Top 20 queries with full table scans
  • TOP 15 reader queries (95% percentile)
  • TOP 15 row look queries (95% percentile)
  • TOP 15 total latency queries (95% percentile)
  • TOP 15 max latency queries (95% percentile)
  • TOP 15 average latency queries (95% percentile)
  • Top 20 queries with sort
  • Last 50 queries with sort
  • TOP 15 row sorting queries with sort
  • TOP 15 total latency queries with sort
  • TOP 15 merge queries with sort
  • TOP 15 average sort merges queries with sort
  • TOP 15 scans queries with sort
  • TOP 15 range queries with sort
  • Top 20 queries with temp table
  • Last 50 queries with temp table
  • TOP 15 total latency queries with temp table
  • TOP 15 queries with temp table to disk
  • TOP 15 class events by number
  • TOP 30 events by number
  • TOP 15 class events by total latency
  • TOP 30 events by total latency
  • TOP 15 class events by max latency
  • TOP 30 events by max latency