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Take the statistics collector out of the loop for monitoring backends'

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current commands; instead, store current-status information in shared
memory.  This substantially reduces the overhead of stats_command_string
and also ensures that pg_stat_activity is fully up to date at all times.
Per my recent proposal.
This commit is contained in:
Tom Lane
2006-06-19 01:51:22 +00:00
parent 6075feed40
commit b13c9686d0
11 changed files with 880 additions and 1198 deletions
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16
src/backend/utils/misc/postgresql.conf.sample
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@ -320,6 +320,14 @@
# RUNTIME STATISTICS
#---------------------------------------------------------------------------
# - Query/Index Statistics Collector -
#stats_command_string = off
#stats_start_collector = on # needed for block or row stats
#stats_block_level = off
#stats_row_level = off
#stats_reset_on_server_start = off
# - Statistics Monitoring -
#log_parser_stats = off
@ -327,14 +335,6 @@
#log_executor_stats = off
#log_statement_stats = off
# - Query/Index Statistics Collector -
#stats_start_collector = on
#stats_command_string = off
#stats_block_level = off
#stats_row_level = off
#stats_reset_on_server_start = off
#---------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS