PostgreSQL 12在日志记录上的改进是什么

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对于每一个客户端连接，PG都会请求Postmaster，然后fork一个后台进程来处理请求，Postmaster期望每一个客户端请求发送startup message给PG Server，startup packet中的信息用于配置fork的后台进程。对于端口扫描、HA解决方案中的心跳检测等等都会发请求给PG Server port，PG会启动进程来处理这些连接，但安全检测、HA脚本等不同于常规的客户端，对于这些请求，PG会产生一条日志条目，因此会造成日志文件的膨胀而导致不必要的IO开销。

PG 11
使用工具nc来访问数据库端口，日志中会产生无用的日志条目。

[xdb@localhost ~]$ psql -c 'select version();'Timing is on.Expanded display is used automatically.                                                 version                                                 --------------------------------------------------------------------------------------------------------- PostgreSQL 11.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit(1 row)Time: 56.253 ms[xdb@localhost ~]$ [xdb@localhost ~]$ for i in {1..100}; do      nc -zv localhost 5110 ; doneNcat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5110.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5110.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5110.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5110.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds....

数据库日志输出

2019-12-09 14:35:55.468 CST,,,16065,"::1:57554",5dedeb4b.3ec1,1,"",2019-12-09 14:35:55 CST,,0,LOG,08P01,"incomplete startup packet",,,,,,,,,""2019-12-09 14:35:55.479 CST,,,16067,"::1:57556",5dedeb4b.3ec3,1,"",2019-12-09 14:35:55 CST,,0,LOG,08P01,"incomplete startup packet",,,,,,,,,""2019-12-09 14:35:55.490 CST,,,16069,"::1:57558",5dedeb4b.3ec5,1,"",2019-12-09 14:35:55 CST,,0,LOG,08P01,"incomplete startup packet",,,,,,,,,""2019-12-09 14:35:55.503 CST,,,16071,"::1:57560",5dedeb4b.3ec7,1,"",2019-12-09 14:35:55 CST,,0,LOG,08P01,"incomplete startup packet",,,,,,,,,""2019-12-09 14:35:55.513 CST,,,16073,"::1:57562",5dedeb4b.3ec9,1,"",2019-12-09 14:35:55 CST,,0,LOG,08P01,"incomplete startup packet",,,,,,,,,""...

这些日志其实是无用的日志信息，可以不作记录。

PG 12

[xdb@localhost ~]$ psql -h localhost -p 5120 -U pg12 -c 'select version();'Timing is on.Expanded display is used automatically.                                                 version                                                 --------------------------------------------------------------------------------------------------------- PostgreSQL 12.1 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit(1 row)Time: 60.207 ms[xdb@localhost ~]$ [xdb@localhost ~]$ for i in {1..100}; do      nc -zv localhost 5120 ; doneNcat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5120.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5120.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5120.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5120.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.Ncat: Version 7.50 ( https://nmap.org/ncat )Ncat: Connected to ::1:5120.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.[xdb@localhost ~]$ ...

数据库日志信息，相对于PG 11，没有出现无用的日志信息

[pg12@localhost ~]$ tail -f $PGDATA/pg_log/postgresql-2019-12-09.log 2019-12-09 14:18:59.317 CST [1813] LOG:  ending log output to stderr2019-12-09 14:18:59.317 CST [1813] HINT:  Future log output will go to log destination "csvlog".

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