pg_control文件记录了pg服务器内部的信息,如最新检查点时间、服务器状态、WAL文件位置,总之和数据库可能损坏相关的信息这里都有维护,还包括LC_CTYPE/LC_COLLATE等信息,和oracle控制文件差不多的。如果该文件被删除,实例将无法启动。运行时,会在共享内存中维护一份pg_control的镜像。 pg_control控制文件可以看做是Post...
对于PostgreSQL 13.2版本,pg_control文件中的内容即为ControlFileData结构体变量值。该结构体类型声明如下(共35个成员变量): typedef struct ControlFileData { uint64 system_identifier; //系统唯一标识 uint32 pg_control_version; //pg的控制版本号. 在13.2版本中,#define PG_CONTROL_VERSION 13...
有两种方式,一种是通过SQL查询,如下: select*frompg_catalog.pg_control_checkpoint();select*frompg_catalog.pg_control_system();select*frompg_catalog.pg_control_init(); -- 获取结果和pg_controldata相同select*frompg_catalog.pg_control_recovery(); 还有一种是通过命令行。如下: [postgres@hs-10-20-30...
//pgaudit.control '/pg13/pg13/share/postgresql/extension/' /usr/bin/install -c -m 644 .//pgaudit--1.5.sql '/pg13/pg13/share/postgresql/extension/' [pg13@lhrpgcituscn80 pgaudit-1.5.0]$ psql psql (13.3) Type "help" for help. postgres=# postgres=# select * from pg_available_...
Checkingforsystem-defined composite typesinusertables ok Checkingforreg*data typesinusertables ok Checkingforcontrib/isnwithbigint-passing mismatch ok Checkingforincompatible "aclitem" data typeinusertables ok Checkingforpresenceofrequired libraries ok ...
for counter column, store the remote change in__pgcat_lww, use system identifier frompg_control_system()to identify different remote peers Create a view to filter the__pgcat_lwwso that it would not be exported to application level. For example, if you have tablefoobar, then it would cr...
这个据说是PostgreSQL的control file。 到底如何呢,先看看改名后如何,把pg_control文件改名,然后启动 Postgres,运行时得到信息: [postgres@pg101 bin]$ postgres: could notfindthe database system Expected tofinditinthe directory"/usr/local/pgsql/bin/../data", ...
root@lhrpg64302:/# pg_controldata pg_control version number: 1201 Catalog version number: 201909212 Database system identifier: 6954163543229509670 Database cluster state: in production pg_control last modified: Fri 23 Apr 2021 09:54:48 AM CST Latest checkpoint location: 0/5000098 Latest checkpoint...
This creates.pgsync.ymlfor you to customize. We recommend checking this into your version control (assuming it doesn’t contain sensitive information).pgsynccommands can be run from this directory or any subdirectory. How to Use First, make sure your schema is set up in both databases. We ...
pg_resetwal清除预写日志WAL,并可选地重置pg_control文件中的一些其他控制信息。当WAL文件或pg_control控制文件损坏时,导致数据库无法启动时,该操作将作为数据库修复的最后手段使用。 通过pg_resetwal修复而启动数据库后,可能会由于部分提交的事务,导致数据库可能存在数据不一致的情况。所以,应该立即转储数据,建议重新初...