PG的share_buffers设置

注意：配置share_buffers参数时，单位为块，若配置512MB大小，则值应该配置512*1024/8，重启生效

[pg12@wcbpgcm1 log]$ psql
psql (12.9)
Type "help" for help.postgres=# show shared_buffers ;  shared_buffers
----------------128MB
(1 row)postgres=# select * from pg_settings where name='shared_buffers';   name      | setting | unit |        category         |                          short_desc                          | extra_
desc |  context   | vartype |       source       | min_val |  max_val   | enumvals | boot_val | reset_val |           sourcefile  | sourceline | pending_restart
----------------+---------+------+-------------------------+--------------------------------------------------------------+-------
-----+------------+---------+--------------------+---------+------------+----------+----------+-----------+-----------------------
----------+------------+-----------------shared_buffers | 16384   | 8kB  | Resource Usage / Memory | Sets the number of shared memory buffers used by the server. |       | postmaster | integer | configuration file | 16      | 1073741823 |          | 1024     | 16384     | /home/pg12/data/postgr
esql.conf |        122 | f
(1 row)postgres=#  alter system set shared_buffers=512MB;
ERROR:  syntax error at or near "MB"
LINE 1: alter system set shared_buffers=512MB;^
postgres=# alter system set shared_buffers=512*1024/8;
ERROR:  syntax error at or near "*"
LINE 1: alter system set shared_buffers=512*1024/8;^
postgres=# alter system set shared_buffers=512*1024/8;
ERROR:  syntax error at or near "*"
LINE 1: alter system set shared_buffers=512*1024/8;^
postgres=#
postgres=# SELECT 512*1024/8;?column?
----------65536
(1 row)postgres=# alter system set shared_buffers=65536;
ALTER SYSTEM
postgres=# exit
[pg12@wcbpgcm1 log]$ pg_ctl restart
waiting for server to shut down.... done
server stopped
waiting for server to start....2022-04-14 21:33:55.484 CST [28847] LOG:  pgaudit extension initialized
2022-04-14 21:33:55.484 CST [28847] LOG:  starting PostgreSQL 12.9 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit
2022-04-14 21:33:55.485 CST [28847] LOG:  listening on IPv4 address "127.0.0.1", port 5432
2022-04-14 21:33:55.485 CST [28847] LOG:  could not bind IPv6 address "::1": Cannot assign requested address
2022-04-14 21:33:55.485 CST [28847] HINT:  Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
2022-04-14 21:33:55.486 CST [28847] LOG:  listening on Unix socket "/tmp/.s.PGSQL.5432"
2022-04-14 21:33:55.507 CST [28847] LOG:  redirecting log output to logging collector process
2022-04-14 21:33:55.507 CST [28847] HINT:  Future log output will appear in directory "log".done
server started
[pg12@wcbpgcm1 log]$ psql
psql (12.9)
Type "help" for help.postgres=# show shared_buffers ; shared_buffers
----------------512MB
(1 row)postgres=# \q
[pg12@wcbpgcm1 log]$

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PG的share_buffers设置

PG的share_buffers设置

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