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MySQL Performance Tuning Variables

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FromDual GmbH
FromDual GmbH

Most important MySQL Performance Tuning Variables and Status Variables.

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www.fromdual.com 1 / 24 MySQL Performance Tuning DOAG 2013 Datenbank 14. Mai 2013, Düsseldorf Oli Sennhauser Senior MySQL Berater, FromDual GmbH oli.sennhauser@fromdual.com
www.fromdual.com 2 / 24 Über FromDual GmbH ● FromDual bietet neutral und unabhängig: ● Beratung für MySQL ● Support für MySQL und Galera Cluster ● Remote-DBA Dienstleistungen für MySQL ● MySQL Schulungen ● Oracle Silver Partner (OPN) www.fromdual.com
www.fromdual.com 3 / 24 Inhalt HA Solutions ➢ Read scale-out ➢ Replication set-up for HA ➢ Active/passive fail-over ➢ MySQL Cluster ➢ Replication Cluster ➢ Storage-Engine-Replication MySQL Performance Tuning mit System-Variablen ➢ Performance Tuning Hebel ➢ MySQL System Variablen ➢ MySQL Status Variablen ➢ MySQL Architektur ➢ Speicherbelegung ➢ Session Variablen ➢ Globale Variablen ➢ MyISAM Variablen ➢ InnoDB Variablen ➢ Monitoring ➢ Informationen
www.fromdual.com 4 / 24 Performance Tuning Hebel
www.fromdual.com 5 / 24 MySQL System Variablen ● Datenbank-Konfiguration my.cnf mysqld ­­help –verbose /etc/my.cnf /etc/mysql/my.cnf  /usr/local/mysql/etc/my.cnf  $basedir/my.cnf ~/.my.cnf SHOW GLOBAL VARIABLES;
www.fromdual.com 6 / 24 MySQL Status Variablen ● Was wir damit anrichten sieht man mit: SHOW /*!50001 GLOBAL */ STATUS; SHOW ENGINE INNODB STATUSG
www.fromdual.com 7 / 24 MySQL Architektur mysqld Application / Client Thread Cache Connection Manager User Au- thentication Command Dispatcher Logging Query Cache Module Query Cache Parser Optimizer Access Control Table Manager Table Open Cache (.frm, fh) Table Definition Cache (tbl def.) Handler Interface MyISAM Memory NDB PBXTInnoDB ...Aria XtraDB Tokutek
www.fromdual.com 8 / 24 Speicherbelegung Storage Engines MySQL Server (mysqld) Client 2 Client N Local Memory Areas Client 1 read_buffer sort_buffer tmp_table read_bufferread_buffer sort_buffer table_open_cache table_definition_cache query_cache_size etc... Global Memory Area key_buffer_size innodb_buffer_pool_size innodb_log_buffer_size etc...
www.fromdual.com 9 / 24 Thread Cache ● Konifguration: thread_cache_size ● Status: threads_created +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name        | Value | +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Threads_cached       | 8     | | Threads_connected    | 242   | | Threads_created      | 15355 | | Threads_running      | 16    | +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
www.fromdual.com 10 / 24 Query Cache ● Konfiguration: query_cache_size ● Status: Com_select, Qcache_hits ● Hit ratio: Qache_hits/(Com_select + Qcache_hits) +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+ | Variable_name           | Value    | +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+ | Com_select              | 25712    | | Qcache_free_memory      | 19553200 | | Qcache_hits             | 65137    | | Qcache_inserts          | 172167   | +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+
www.fromdual.com 11 / 24 Per Session Parameter ● Im „Executor“ ● Alloziert/Dealloziert „on Demand“ ● Per Session oder global einstellbar ● Meisst Effekt gering oder gar kontraproduktiv! ● Join Buffer ● join_buffer_size ● Read Buffer und Read Random Buffer ● read_buffer_size, read_rnd_buffer_size
www.fromdual.com 12 / 24 Sort Buffer, temporäre Tabellen ● Temporäre Tabellen (MEMORY oder MyISAM) ● Konfiguration: tmp_table_size, (max_heap_table_size) ● Status: created_tmp_tables, created_tmp_disk_tables ● Sort Buffer ● Konfiguration: sort_buffer_size ● Status: sort_merge_passes
www.fromdual.com 13 / 24 Table Definition Cache ● Ab v5.1 ● Enthält Info vom .frm File ● Konfiguration: table_definition_cache ● Status: open_table_definitions,  opened_table_defintions +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name            | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Open_table_definitions   | 100   | | Opened_table_definitions | 100   | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
www.fromdual.com 14 / 24 Table (Open) Cache ● Ab v5.1 ● File-Descriptioren (1 pro Connection pro Table) ● Früher table_cache ● Konfiguration: table_open_cache ● Status: open_tables, opened_tables +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name            | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Open_tables              | 64    | | Opened_tables            | 11812 | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
www.fromdual.com 15 / 24 MyISAM ● Bis MySQL 5.1 default Storage Engine ● Konfiguration: key_buffer_size ● Status: Key_blocks_used,  Key_blocks_unused, Key_reads,  Key_read_requests
www.fromdual.com 16 / 24 InnoDB Buffer Pool ● InnoDB seit 5.5 default Storage Engine ● InnoDB Buffer Pool ● Konfiguration: innodb_buffer_pool_size, innodb_buffer_pool_instances, innodb_io_capacity mysqld system table space: ibdata1 table table space table table spacetable table space ib_logfile1ib_logfile2ib_logfilen undo double write area tables/indexes dd OS file cache sync async buffer pool secondary index buffer trxlogbuffer data pages index pages adaptive hash idx undo records lock info table
www.fromdual.com 17 / 24 InnoDB Buffer Pool ● Status: innodb_buffer_pool_pages_%,  Innodb_buffer_bytes_%, Innodb_data_%
www.fromdual.com 18 / 24 InnoDB Log File ● REDO Log, Transaction Log ● Konfiguration: innodb_log_file_size,  innodb_flush_log_at_trx _commit ● Status: innodb%log% mysqld system table space: ibdata1 table table space table table spacetable table space ib_logfile1ib_logfile2ib_logfilen undo double write area tables/indexes dd OS file cache sync async buffer pool secondary index buffer trxlogbuffer data pages index pages adaptive hash idx undo records lock info table
www.fromdual.com 19 / 24 Binary Log Application ApplicationApplication mysqld bin-log.n binlog_cache_size binlog_stmt_cache_size sync_binlog +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name              | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Binlog_cache_disk_use      | 3456  | | Binlog_cache_use           | 12786 | | Binlog_stmt_cache_disk_use | 0     | | Binlog_stmt_cache_use      | 0     | +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
www.fromdual.com 20 / 24 Monitoring ● Von Hand: ● SHOW GLOBAL STATUS; ● SHOW ENGINE INNODB STATUSG ● Performance Schema (P_S, >= v5.5) ● Irgend ein graphisches Monitoring Tool...
www.fromdual.com 21 / 24 PERFORMANCE_SCHEMA ● In Diskussion seit mindestens 2006 ● Eingeführt in MySQL 5.5 (2010) → Einblick in die Datenbank ● In v5.5 disabled, in v5.6 enabled per default performance_schema = 1 ● Overhead 5% - 200%! → also Vorsicht!
www.fromdual.com 22 / 24 Beispiel: Table I/O waits SELECT OBJECT_SCHEMA, OBJECT_NAME      , ROUND(SUM_TIMER_WAIT/1000000000, 3) AS SUM_TIMER_WAIT      , ROUND(SUM_TIMER_READ/1000000000, 3) AS SUM_TIMER_READ      , ROUND(SUM_TIMER_WRITE/1000000000, 3) AS SUM_TIMER_WRITE   FROM table_io_waits_summary_by_table  ORDER BY SUM_TIMER_WAIT DESC  LIMIT 10 ; +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+ | OBJECT_SCHEMA | OBJECT_NAME  | SUM_TIMER_WAIT | SUM_TIMER_READ | SUM_TIMER_WRITE | +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+ | zabbix        | items        |    1182496.258 |     616630.696 |      565865.562 | | zabbix        | history_uint |     889884.116 |     370528.991 |      519355.125 | | zabbix        | history_str  |     460411.155 |     246159.458 |      214251.697 | | zabbix        | history      |     389815.659 |      86285.980 |      303529.679 | | zabbix        | trends_uint  |     133955.560 |     107365.626 |       26589.934 | | zabbix        | functions    |     128657.654 |     128657.654 |           0.000 | | zabbix        | trends       |      43683.159 |      36314.732 |        7368.428 | | mpm           | mpm_agent    |      27837.056 |      27837.056 |           0.000 | | zabbix        | hosts        |      23820.284 |      14044.672 |        9775.612 | | zabbix        | triggers     |      21052.459 |      20970.604 |          81.855 | +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+
www.fromdual.com 23 / 24 Informationen ● MySQL System Variablen: http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html ● MySQL Status Variablen: http://dev.mysql.com/doc/refman/5.5/en/server-status-variables.html ● MySQL DB Health Check: http://www.fromdual.com/mysql-database-health-check ● MySQL Performance Monitor: http://www.fromdual.com/mysql-performance-monitor
www.fromdual.com 24 / 24 Q & A Fragen ? Diskussion? Wir haben Zeit für ein Performance Audit...! ● FromDual bietet neutral und unabhängig: ● Beratung ● Remote-DBA ● Support für MySQL und Galera Cluster ● Schulung www.fromdual.com/presentations

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MySQL Performance Tuning Variables

  • 1. www.fromdual.com 1 / 24 MySQL Performance Tuning DOAG 2013 Datenbank 14. Mai 2013, Düsseldorf Oli Sennhauser Senior MySQL Berater, FromDual GmbH oli.sennhauser@fromdual.com
  • 2. www.fromdual.com 2 / 24 Über FromDual GmbH ● FromDual bietet neutral und unabhängig: ● Beratung für MySQL ● Support für MySQL und Galera Cluster ● Remote-DBA Dienstleistungen für MySQL ● MySQL Schulungen ● Oracle Silver Partner (OPN) www.fromdual.com
  • 3. www.fromdual.com 3 / 24 Inhalt HA Solutions ➢ Read scale-out ➢ Replication set-up for HA ➢ Active/passive fail-over ➢ MySQL Cluster ➢ Replication Cluster ➢ Storage-Engine-Replication MySQL Performance Tuning mit System-Variablen ➢ Performance Tuning Hebel ➢ MySQL System Variablen ➢ MySQL Status Variablen ➢ MySQL Architektur ➢ Speicherbelegung ➢ Session Variablen ➢ Globale Variablen ➢ MyISAM Variablen ➢ InnoDB Variablen ➢ Monitoring ➢ Informationen
  • 5. www.fromdual.com 5 / 24 MySQL System Variablen ● Datenbank-Konfiguration my.cnf mysqld ­­help –verbose /etc/my.cnf /etc/mysql/my.cnf  /usr/local/mysql/etc/my.cnf  $basedir/my.cnf ~/.my.cnf SHOW GLOBAL VARIABLES;
  • 6. www.fromdual.com 6 / 24 MySQL Status Variablen ● Was wir damit anrichten sieht man mit: SHOW /*!50001 GLOBAL */ STATUS; SHOW ENGINE INNODB STATUSG
  • 7. www.fromdual.com 7 / 24 MySQL Architektur mysqld Application / Client Thread Cache Connection Manager User Au- thentication Command Dispatcher Logging Query Cache Module Query Cache Parser Optimizer Access Control Table Manager Table Open Cache (.frm, fh) Table Definition Cache (tbl def.) Handler Interface MyISAM Memory NDB PBXTInnoDB ...Aria XtraDB Tokutek
  • 8. www.fromdual.com 8 / 24 Speicherbelegung Storage Engines MySQL Server (mysqld) Client 2 Client N Local Memory Areas Client 1 read_buffer sort_buffer tmp_table read_bufferread_buffer sort_buffer table_open_cache table_definition_cache query_cache_size etc... Global Memory Area key_buffer_size innodb_buffer_pool_size innodb_log_buffer_size etc...
  • 9. www.fromdual.com 9 / 24 Thread Cache ● Konifguration: thread_cache_size ● Status: threads_created +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name        | Value | +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Threads_cached       | 8     | | Threads_connected    | 242   | | Threads_created      | 15355 | | Threads_running      | 16    | +­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
  • 10. www.fromdual.com 10 / 24 Query Cache ● Konfiguration: query_cache_size ● Status: Com_select, Qcache_hits ● Hit ratio: Qache_hits/(Com_select + Qcache_hits) +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+ | Variable_name           | Value    | +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+ | Com_select              | 25712    | | Qcache_free_memory      | 19553200 | | Qcache_hits             | 65137    | | Qcache_inserts          | 172167   | +­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­+
  • 11. www.fromdual.com 11 / 24 Per Session Parameter ● Im „Executor“ ● Alloziert/Dealloziert „on Demand“ ● Per Session oder global einstellbar ● Meisst Effekt gering oder gar kontraproduktiv! ● Join Buffer ● join_buffer_size ● Read Buffer und Read Random Buffer ● read_buffer_size, read_rnd_buffer_size
  • 12. www.fromdual.com 12 / 24 Sort Buffer, temporäre Tabellen ● Temporäre Tabellen (MEMORY oder MyISAM) ● Konfiguration: tmp_table_size, (max_heap_table_size) ● Status: created_tmp_tables, created_tmp_disk_tables ● Sort Buffer ● Konfiguration: sort_buffer_size ● Status: sort_merge_passes
  • 13. www.fromdual.com 13 / 24 Table Definition Cache ● Ab v5.1 ● Enthält Info vom .frm File ● Konfiguration: table_definition_cache ● Status: open_table_definitions,  opened_table_defintions +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name            | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Open_table_definitions   | 100   | | Opened_table_definitions | 100   | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
  • 14. www.fromdual.com 14 / 24 Table (Open) Cache ● Ab v5.1 ● File-Descriptioren (1 pro Connection pro Table) ● Früher table_cache ● Konfiguration: table_open_cache ● Status: open_tables, opened_tables +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name            | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Open_tables              | 64    | | Opened_tables            | 11812 | +­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
  • 15. www.fromdual.com 15 / 24 MyISAM ● Bis MySQL 5.1 default Storage Engine ● Konfiguration: key_buffer_size ● Status: Key_blocks_used,  Key_blocks_unused, Key_reads,  Key_read_requests
  • 16. www.fromdual.com 16 / 24 InnoDB Buffer Pool ● InnoDB seit 5.5 default Storage Engine ● InnoDB Buffer Pool ● Konfiguration: innodb_buffer_pool_size, innodb_buffer_pool_instances, innodb_io_capacity mysqld system table space: ibdata1 table table space table table spacetable table space ib_logfile1ib_logfile2ib_logfilen undo double write area tables/indexes dd OS file cache sync async buffer pool secondary index buffer trxlogbuffer data pages index pages adaptive hash idx undo records lock info table
  • 17. www.fromdual.com 17 / 24 InnoDB Buffer Pool ● Status: innodb_buffer_pool_pages_%,  Innodb_buffer_bytes_%, Innodb_data_%
  • 18. www.fromdual.com 18 / 24 InnoDB Log File ● REDO Log, Transaction Log ● Konfiguration: innodb_log_file_size,  innodb_flush_log_at_trx _commit ● Status: innodb%log% mysqld system table space: ibdata1 table table space table table spacetable table space ib_logfile1ib_logfile2ib_logfilen undo double write area tables/indexes dd OS file cache sync async buffer pool secondary index buffer trxlogbuffer data pages index pages adaptive hash idx undo records lock info table
  • 19. www.fromdual.com 19 / 24 Binary Log Application ApplicationApplication mysqld bin-log.n binlog_cache_size binlog_stmt_cache_size sync_binlog +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Variable_name              | Value | +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+ | Binlog_cache_disk_use      | 3456  | | Binlog_cache_use           | 12786 | | Binlog_stmt_cache_disk_use | 0     | | Binlog_stmt_cache_use      | 0     | +­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­+
  • 20. www.fromdual.com 20 / 24 Monitoring ● Von Hand: ● SHOW GLOBAL STATUS; ● SHOW ENGINE INNODB STATUSG ● Performance Schema (P_S, >= v5.5) ● Irgend ein graphisches Monitoring Tool...
  • 21. www.fromdual.com 21 / 24 PERFORMANCE_SCHEMA ● In Diskussion seit mindestens 2006 ● Eingeführt in MySQL 5.5 (2010) → Einblick in die Datenbank ● In v5.5 disabled, in v5.6 enabled per default performance_schema = 1 ● Overhead 5% - 200%! → also Vorsicht!
  • 22. www.fromdual.com 22 / 24 Beispiel: Table I/O waits SELECT OBJECT_SCHEMA, OBJECT_NAME      , ROUND(SUM_TIMER_WAIT/1000000000, 3) AS SUM_TIMER_WAIT      , ROUND(SUM_TIMER_READ/1000000000, 3) AS SUM_TIMER_READ      , ROUND(SUM_TIMER_WRITE/1000000000, 3) AS SUM_TIMER_WRITE   FROM table_io_waits_summary_by_table  ORDER BY SUM_TIMER_WAIT DESC  LIMIT 10 ; +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+ | OBJECT_SCHEMA | OBJECT_NAME  | SUM_TIMER_WAIT | SUM_TIMER_READ | SUM_TIMER_WRITE | +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+ | zabbix        | items        |    1182496.258 |     616630.696 |      565865.562 | | zabbix        | history_uint |     889884.116 |     370528.991 |      519355.125 | | zabbix        | history_str  |     460411.155 |     246159.458 |      214251.697 | | zabbix        | history      |     389815.659 |      86285.980 |      303529.679 | | zabbix        | trends_uint  |     133955.560 |     107365.626 |       26589.934 | | zabbix        | functions    |     128657.654 |     128657.654 |           0.000 | | zabbix        | trends       |      43683.159 |      36314.732 |        7368.428 | | mpm           | mpm_agent    |      27837.056 |      27837.056 |           0.000 | | zabbix        | hosts        |      23820.284 |      14044.672 |        9775.612 | | zabbix        | triggers     |      21052.459 |      20970.604 |          81.855 | +­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­+­­­­­­­­­­­­­­­­­+
  • 23. www.fromdual.com 23 / 24 Informationen ● MySQL System Variablen: http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html ● MySQL Status Variablen: http://dev.mysql.com/doc/refman/5.5/en/server-status-variables.html ● MySQL DB Health Check: http://www.fromdual.com/mysql-database-health-check ● MySQL Performance Monitor: http://www.fromdual.com/mysql-performance-monitor
  • 24. www.fromdual.com 24 / 24 Q & A Fragen ? Diskussion? Wir haben Zeit für ein Performance Audit...! ● FromDual bietet neutral und unabhängig: ● Beratung ● Remote-DBA ● Support für MySQL und Galera Cluster ● Schulung www.fromdual.com/presentations