在PG 12以前的版本,备库提升为主库需在备库主机上执行命令或者通过生成触发文件进行触发,在PG 12中,可通过客户端连接到数据库后执行pg_promote函数实现. 下面以一个简单的例子进行说明. 搭建流复制环境 参照PostgreSQL DBA(31) - Backup&Recovery#4(搭建流复制) ,注意在PG 12,recovery.conf文件已废弃,相关的配...
postgres=# select pid,usename,application_name,client_addr,state,sync_state from pg_stat_replication; 可以在sync_state该列下看到async,async表示异步流复制。表示流复制环境搭建完成。 主备切换 pg12开始新增了一个pg_promote()函数,让我们可以通过SQL命令激活备库。 pg_promote()语法: pg_promote(wait boo...
[postgres@pg02 ~]$ pg_basebackup -h 192.168.56.101 -p 5432 -U repuser -Fp -Xs -Pv -R -D /var/lib/pgsql/12/data Password: pg_basebackup: initiating base backup, waiting for checkpoint to complete pg_basebackup: checkpoint completed pg_basebackup: write-ahead log start point: 0/A00002...
waiting for checkpoint to complete pg_basebackup: checkpoint completed pg_basebackup: write-ahead log start point: 0/8000028 on timeline 2 pg_basebackup: starting background WAL receiver pg_basebackup: created temporary
I have done test using the pcp_promote_node command, and I see that the show pool_nodes; shows the node I select as primary, however on postgres side the command SELECT pg_is_in_recovery(); show that server still in recovery. All the pcp_promote_node command does, is detach master ...
[postgres@localhost data]$ pg_controldata /opt/postgresql-11.6/data/| grep 'Database cluster state' Database cluster state: shut down 3、提升从库为主库 这个时候从库保持运行状态,不需要停掉 [postgres@localhost data]$ pg_ctl promote -D /opt/postgresql-11.6/data/ ...
postgresql复制流主备切换之pg_ctl promote方式pg_ctl promote主备切换步骤和文件触发方式大体相同,只是步骤1中不需要配置recovery.conf配置文件中的trigger_file参数,并且步骤3中换成以pg_ctl promote方式进行主备切换,方法/步骤 1 1.配置备库recovery.conf配置recovery.confrecovery_target_timeline='latest&#...
② pg_basebackup方式部署 本次将介绍pg_basebackup方式部署。 1.两台都要安装postgresql 2.主库创建创建Replication用户(以下都是主库操作) CREATE ROLE rep login replication password 'rep'; 修改master的pg_hba.conf文件: 修改Master库数据库配置(postgresql.conf) ...
在主服务器上执行pg_ctl promote命令将一个从服务器提升为主服务器。 2、流复制(Streaming Replication) 配置主服务器(Master):设置wal_level参数为logical,启用WAL归档,并设置hot_standby参数为on。 配置从服务器(Slave):连接到主服务器,执行pg_basebackup命令进行备份,然后创建一个基于备份的起始恢复点。
./pg_ctlpromote-D../sb_data/serverpromoting 1. 2. 连接到提升后的从服务并插入一行: 复制 -bash-4.2$./edb-psql-p5432edbPassword:psql.bin(10.7)Type"help"forhelp.edb=#insertintoabcvalues(4,'Four'); 1. 2. 3. 4. 5. 6. 7.