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Fujii Masao 9fbc3f318d pg_stat_statements: Track number of times pgss entries were deallocated. ... If more distinct statements than pg_stat_statements.max are observed, pg_stat_statements entries about the least-executed statements are deallocated. This commit enables us to track the total number of times those entries were deallocated. That number can be viewed in the pg_stat_statements_info view that this commit adds. It's useful when tuning pg_stat_statements.max parameter. If it's high, i.e., the entries are deallocated very frequently, which might cause the performance regression and we can increase pg_stat_statements.max to avoid those frequent deallocations. The pg_stat_statements_info view is intended to display the statistics of pg_stat_statements module itself. Currently it has only one column "dealloc" indicating the number of times entries were deallocated. But an upcoming patch will add other columns (for example, the time at which pg_stat_statements statistics were last reset) into the view. Author: Katsuragi Yuta, Yuki Seino Reviewed-by: Fujii Masao Discussion: https://postgr.es/m/0d9f1107772cf5c3f954e985464c7298@oss.nttdata.com		5 years ago
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expected	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago
sql	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago
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Makefile	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago
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pg_stat_statements--1.7--1.8.sql	Change the display of WAL usage statistics in Explain.	6 years ago
pg_stat_statements--1.8--1.9.sql	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago
pg_stat_statements.c	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago
pg_stat_statements.conf	…
pg_stat_statements.control	pg_stat_statements: Track number of times pgss entries were deallocated.	5 years ago