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PG短连接对系统性能有很大影响。# test.sqlselect 1;[postgres@master ~]$ pgbench -M extended -n -r -f ./test.sql -c 16 -j 4 -C -T 30transaction type: ./test.sqlscaling factor: 1query mode: extendednumber of clients: 16number of threads: 4duration: 30 s...

In order to speed up operations and reduce disk I/O, the kernel usually does as much caching as it has memory. By design, pages containing cached data can be repurposed on-demand for other uses (e.g., apps). Repurposing memory for use in this way is no...

postgres=# \h explainCommand: EXPLAINDescription: show the execution plan of a statementSyntax:EXPLAIN [ ( option [, ...] ) ] statementEXPLAIN [ ANALYZE ] [ VERBOSE ] statementwhere option can be one of: ANALYZE [ boolean ] ## 此参数默认为关闭，当...