Monitoring MySQL. Kristian Köhntopp

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1 Monitoring MySQL Kristian Köhntopp

2 I am... Kristian Köhntopp Database architecture at a small travel agency in Amsterdam In previous lives: MySQL, web.de, NetUSE, MMC Kiel, PHP, PHPLIB, various FAQs and Howto

3 You are Job DBA, Developer, General IT, IT Management Using version , 4.0, 4.1, 5.0, 5.1 Using MySQL for... Webapps, Enterprise, Embedded,... Number of servers... 1, <3, <10, <25, <100, 100 or more

4 Why Monitoring? Audience Consumers of monitoring data Metrics What kind of data necessary? Toolbox Which kind of tool to use?

5 Why Monitoring? Who requires monitoring? Operations (Incident) Infrastructure Development (Capacity) Feature Development (Debug) Compliance (SLA, Legal)

6 Why Monitoring? Each kind of monitoring has different Purpose Metric Raw data, Notification latency Deliverable HA requirements

7 Incident detection Purpose: Are we still online? Metric: High level availability test w/ binary outcome Deliverable: Ticket to Helpdesk Operating Incident Management Latency: Seconds HA Requirement: Minutes, high

8 Capacity planning Purpose: When can I guarantee server overload? (Negative SLA) Metric: detailed records of variables in all subsystems Deliverable: weekly/monthly report to IT Management, general Management Latency: days HA Requirement: days/low

9 Debugging Purpose: Which query crashes the server? Why is this statement slow? Metric: detailed records of variables while processing a single query Deliverable: individual report to single developer Latency: Seconds, Minutes HA Requirement: none

10 Compliance Purpose: Are we fulfilling our contracts? Metric: high level availability tests w/ binary outcome, query times Deliverable: weekly/monthly report to IT management/customer Latency: Days HA Requirement: days, low

11 For Audit Purpose: Detect tampering, alteration and access, create accountability records for changes and access Metric: high level event records with application semantics additionally: inescapable, unforgeable Deliverable: daily/weekly report HA Requirement: Out of path

12 Metrics Data sources at OS level Data sources in MySQL Derived data sources

13 OS Level Internal Availability Check: presence of PID file presence of process test -f linux.pid is not good enough kill -0 $(cat linux.pid) is better than ps axuwww grep mysql[d]

14 OS Level External Availability Check : ping check trivial query Set timeouts for the trivial query according to SLA

15 OS Level Memory Checks: process size in memory VSIZE vs. RSS buffer cache size ( free -m ) swap check! vm.swappiness = 0

16 OS Level iostat -x 1 3 output In general, databases are limited by seek/sec, not MB/sec SSD, FusionIO Network I/O quality Smokeping? (Cluster!)

17 OS Level

18 MySQL General Counters and Config: SHOW /*!50000 GLOBAL */ STATUS; SHOW /*!50000 GLOBAL */ VARIABLES; What is running? SHOW FULL PROCESSLIST;

19 MySQL File Handles: SHOW TABLE STATUS; SHOW OPEN TABLES;

20 MySQL Replication: SHOW SLAVE STATUS; SHOW MASTER LOGS; SHOW MASTER STATUS;

21 MySQL InnoDB: SHOW ENGINE INNODB STATUS; SHOW GLOBAL STATUS LIKE 'inno%';

22 Status: General qps: questions/uptime COM_% Counters:

23 Status: General COM_% Counters Read/Writes: ( select + qcache_hits ) / ( insert+update+delete+replace ) Transactions: #commit, rollback/commit, writes/ commit

24 Status: Caches Table Cache (opened_tables/sec ) (table_cache_size open_tables) Thread Cache (threads_created/sec) (thread_cache_size threads_cached)

25 Status: Caches

26 Status: Caches Query-Cache Hit Ratio: qcache_hits*100 / ( qcache_hits + com_select ) Hits vs. Inserts vs. Not Cached

27 Status: Caches Lowmem Prunes: qcache_lowmem_prunes / uptime qcache_lowmem_prunes per second

28 Status: Caches Increase query cache size: less prunes, higher hit ratio Sometimes it is better to delay writes or to split tables instead

29 Status: Caches

30 Status: Connections Connections max_connections max_used_connections max_connections - threads_connected

31 Status: Connections

32 Status: MyISAM Key Cache Hit Ratio: key_read_requests / key_read target 99.7% or better hit ratio

33 Status: MyISAM MyISAM Lock Contention table_locks_waited * 100 / table_locks_immediate <1% good, 1% warning, >3% you are currently dying distinctly nonlinear behavior

34 Status: MyISAM

35 Status: InnoDB Page Cache Usage: Innodb_buffer_pool_pages_free *100 / Innodb_buffer_pool_pages_total Cache Miss Ratio: (Innodb_buffer_pool_reads / Innodb_buffer_pool_read_requests)*100 target: <3%, <1%

36 Status: InnoDB Cache Monitoring: Innodb_buffer_pool_wait_free must not count up! Log-Monitoring: Innodb_log_waits must not count up!

37 Status: InnoDB InnoDB has many more stats See Innotop output, read up on theory Worth a talk of its own

38 Status: temp tables Temp tables per second: created_tmp_tables Temp tables to Disk: created_disk_tmp_tables * 100 / created_tmp_tables

39 Status: temp tables Additional hints: What kind of filesystem is tmpdir pointing to? Are we selecting BLOB/TEXT types? tmp_table size and max_heap_table_size must match

40 Status: temp tables

41 Status: Replication Functionality: Slave_IO_running: YES, Slave_SQL_running: YES Lag: Seconds_behind_master Rate: Read_Master_Log_Pos/sec,

42 Status: Replication

43 Status: Slow Queries Slow Queries in general: Slow_queries/sec Counting evil queries: select_full_join / sec select_full_join / com_select

44 Toolbox: Incidents Incident detection: Nagios family Load Balancer Live Check Post Mortem: A small shell script running per minute

45 Toolbox: Incidents Nagios Plugins Quality: Bad checks Scripts Not compliant w/ standards Incident monitors vs. Compliance monitors

46 Toolbox: Post Mortem Record per minute, keep one week logged to /var/log/mysql_pl uptime, ps auxwww, df -Th, free -m show full processlist; show slave status; show engine innodb status if HAVE_INNODB == YES

47 Toolbox: Incidents

48 Toolbox: Capacity MySQL Enterprise Monitor Cacti or Munin Actual overload tests increase LB weights monitor latency of standardized probe to detect breakage

49 MEM

50 Tools: Cacti Shiny, but creating templates is a pain! Ready-made templates from /p/mysql-cacti-templates/

51 Tools: Capacity Free MySQL SNMP tools are rare Exporting Variables, Status and Slave Status to SNMP: Perl Coprocess (PoC at best) archives/63-guid.html

52 Toolbox: Console inntop (mytop is dead) maatkit (indispenseable) tuning-primer.sh Self-written tools Establish a culture of tool creation

53 Toolbox: Debug MEM w/ proxy Proxy sometimes problematic Alternative: Rig DB access class mk-query-digest w/ SPAN port at switch

54 Toolbox: Debug

55 Toolbox: Audit Trailing controls Agile development Dump comparison mysqldump --no-data & git & diff mk-show-grants & git & diff etc.

56 Toolbox: Audit We have very many servers Critical data on isolated servers Limited access Wonders of an unlimited license

57

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