Replicas are, however, fundamental for the high availability and self-healing of a Postgres cluster, as they can be automatically promoted to primary by CloudNativePG after a failure. When not using the WAL archive or PostgreSQL replication slots (explained below), streaming replicas can lose ...
[postgres@localhost data]$ pg_ctl -D $PGDATA start 在主库上验证slot工作状态 [postgres@localhost pg952]$ psql -h 192.168.230.128 -p 5432 -U postgres psql (9.5.2) Type "help" for help. postgres=# \x Expanded display is on. postgres=# select * from pg_replication_slots; -[ RECORD ...
[postgres@localhost data]$ pg_ctl -D $PGDATA start 在主库上验证slot工作状态 [postgres@localhost pg952]$ psql -h 192.168.230.128 -p 5432 -U postgres psql (9.5.2) Type "help" for help. postgres=# \x Expanded display is on. postgres=# select * from pg_replication_slots; -[ RECORD ...
为了清理 PostgreSQL 并释放一个槽或者增大 max_replication_slots 的值,你可以按照以下步骤进行操作: 1. 检查当前 PostgreSQL 的 max_replication_slots 设置值 首先,你需要检查当前 PostgreSQL 数据库的 max_replication_slots 设置值。这可以通过查询系统视图或使用 SHOW 命令来完成。 sql SHOW max_replication_slots...
Personally, I am always in favor of using at least some extra XLOG segments. Utilizing replication slots 随着PostgreSQL 9.4 的引入,一个更复杂的 XLOG 删除问题的解决方案被引入了——物理复制槽。 正如本书前面已经概述的那样,复制槽确保主服务器仅在 XLOG 已被副本安全使用时才删除它。 对于本节中概述...
“HINT: Close open transactions soon to avoid wraparound problems. You might also need to commit or roll back old prepared transactions, or drop stale replication slots.”“WARNING: oldest xmin is far in the past.” 您可以手动删除Replication Slot来让RDS...
yangjie=# select * from pg_replication_slots ; -[ RECORD 1 ]---±--- slot_name | sub1 plugin | pgoutput slot_type | logical datoid | 16384 database | yangjie temporary | f active | t active_pid | 15386 xmin | catalog_xmin |...
postgres=# checkpoint; CHECKPOINT postgres=# select * from pg_replication_slots; slot_name | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn | wal_status | safe_wal_size | two_phase ...
I see in earlier versions it was used and the Definition itself says also, ” Replication slots are a crash-safe data structure which can be created on either a master or a standby to prevent premature removal of write-ahead log segments needed by a standby, as well as (with hot_standby...
max_replication_slots 通常,数据的变化会写入到WAL文件中,被称为WAL记录。WAL sender进程会将这些WAL日志发送到备机,备机的wal receiver进程接收这些WAL,然后订阅节点回放这些WAL。 Checkpoint后,可以将pg_xlog/pg_wal中不需要的wal文件删除。如果这些WAL没有在订阅节点回放完时,将这些主机上的文件删除,那么复制就会...