Spencer Christensen There are many aspects to managing an RDBMS. Some of these are handled by an experienced DBA, but there are a good many things that any sys admin should be able to take care of if they know what to look for. This presentation will cover basics of managing Postgres, including creating database clusters, overview of configuration, and logging. We will also look at tools to help monitor Postgres and keep an eye on what is going on. Some of the tools we will review are: * pgtop * pg_top * pgfouine * check_postgres.pl. Check_postgres.pl is a great tool that can plug into your Nagios or Cacti monitoring systems, giving you even better visibility into your databases.

1. Postgres Administration for Sysadmins Spencer Christensen Backcountry.com PostgreSQL Conference East, Philadelphia March 26, 2010

3. The Q and L are silent

6. Familiar with databases

7. Want to understand Postgres better

9. Monitoring

11. Highlights of postgresql.conf

12. Logging options, review of log output

13. pg_hba.conf

14. Starting, stopping, restarts

15. Connecting with psql

17. ps

18. du

19. pgtop

20. pg_top

21. check_postgres.pl

22. Pgfouine

24. Multiple installs

25. Multiple instances (different ports, different ip addresses, etc)

28. Helpful comments

29. Default values commented out

30. Some changes require a restart (others can be picked up with a reload)

32. listen_addresses = 'localhost'

33. max_connections = 10

34. statement_timeout = 0 # microseconds

37. -l /path/to/logfile [start|stop|reload|restart|status]

38. Run as owner of data files (created by initdb)

39. -m [smart|fast|immediate] stop Start cluster1

41. log_directory = 'pg_log'

42. syslog_facility = 'LOCAL0'

43. log_connections = off

44. log_disconnections = off

45. log_duration = off

46. log_statement = 'none' # or all, ddl, mod

47. Log output samples LOG: connection received: host=192.168.56.1 port=44738 LOG: connection authorized: user=training database=training LOG: duration: 18.301 ms LOG: duration: 0.898 ms LOG: duration: 1428.301 ms LOG: duration: 2038.301 ms LOG: disconnection: session time: 0:00:12.543 user=training database=training host=192.168.56.1 port=44738

48. Log output samples LOG: connection received: host=192.168.56.1 port=33185 LOG: duration: 23.469 ms LOG: connection authorized: user=training database=training LOG: statement: select * from emusic.sales_item LOG: duration: 0.706 ms LOG: statement: select * from emusic.stores LOG: duration: 0.447 ms LOG: disconnection: session time: 0:00:12.084 user=training database=training host=192.168.56.1 port=33185

51. $PGPORT – port

52. $PGHOST – host

53. $PGUSER – user

54. pg_ctl -l /tmp/pg.log start

55. psql

57. Monitoring

61. Based on mytop

62. Example of running pgtop

66. Disk space

67. Backends

68. Index size

69. Table size

70. Bloat

71. Last vacuum

72. Locks

73. txn_wraparound

76. Example

78. pg_ctl -D $datadir start|stop|reload|status

79. psql

80. Top, du

81. pg_top, pgtop

82. check_postgres.pl

83. Pgfouine

85. Backcountry.com

86. [email_address]

87. [email_address]