并不是说满max_wal_size才会产生检查点,而是看CheckPointSegments(ConvertToXSegs(max_wal_size_mb, wal_segment_size)/(1.0 + CheckPointCompletionTarget))参数,因为做检查点也需要消费一些wal日志,XLogWrite时通过XLogCheckpointNeeded检查是否需要触发检查点。3.min_wal_size:只要WAL日志的磁盘用量保持在这个设置之下...
【0393】Postgres内核 checkpointer process ③ 构建 WAL records 工作缓存区 1. 初始化ThisTimeLineID、RedoRecPtr 函数InitXLOGAccess() 内部会初始化 ThisTimeLineID、wal_segment_size、doPageWrites 和 RedoRecPtr 等全局变量。 下面是这四个变量初始化前的值: (gdb) p ThisTimeLineID $125 =0 (gdb) p ...
lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_custom_query -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_database_size -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_dbstats...
lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_custom_query -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_database_size -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_dbstats...
由于检查指针的工作是从共享缓冲区读取脏页并将其写入磁盘,因此预计该进程会读取大量内存。 如果要减少检查指针在批量插入期间必须执行的磁盘 I/O 量,请增加max_wal_size。 要查看计算机上还有多少 RAM 可用,请查阅输出的“可用”字段free。
check_postgres 检测数据库的健康并报告异常情况 摘要:os: centos 7.4 postgresql: 10.4 check_postgres: 2.24.0check_postgres is a script for monitoring various attributes of your databa... 阅读全文 posted @ 2018-08-27 19:18 peiybpeiyb 阅读(749) 评论(0) 推荐(0) ...
wal_buffers The amount of shared memory used for WAL data that has not yet been written to disk. The default setting is 3% of shared_buffers, but not less than 64kB nor more than the size of one WAL segment, typically 16MB. Conclusion ...
checksum failure count is $$Chksum";[ "$$Chksum" = '0' ] || exit 1interval:5mstart_interval:30sstart_period:5mcommand:>-postgres-c shared_preload_libraries=vectors.so-c 'search_path="$$user", public, vectors'-c logging_collector=on-c max_wal_size=2GB-c shared_buffers=512MB-c wal...
Check if all archived WALs exist between the oldest and the latest WAL needed for the recovery. Use the --wal-segsize argument to set the WAL segment size. The following units are accepted (not case sensitive): b (Byte), k (KB), m (MB), g (GB), t (TB), p (PB), e (EB)...
SELECT pg_database_size('postgres'), pg_database_size('postgres')||'B' AS db_size Required privileges: unprivileged role (depends on the query). database_size (8.1+) Check the variation of database sizes, and return the size of every databases. This service uses the status file (see...