Multi-master replications mean there is more than one node that acts as master nodes. Data is replicated between nodes and updates and insertion can be possible on a group of master nodes. In that case, there are multiple copies of the data. The system is also responsible for resolving any...
支持跨版本复制,主备可以运行不同版本的 PostgreSQL。 物理复制(Physical Replication): 也称为基于块级别的复制。 主库将磁盘数据块以原始形式传输到备库。 备库可以直接从主库的数据文件中恢复数据。 多主复制(Multi-Master Replication): 允许多个节点同时作为主库,相互复制数据。 需要处理数据冲突的问题。 通常用...
In Multi-Master Replication (MMR), changes to table rows in more than one designated master database are replicated to their counterpart tables in every other master database. In this model conflict resolution schemes are often employed to avoid problems like duplicate primary keys. Multi-Master R...
but still, there are some cases where there is a requirement of Multi-Master replication. PostgreSQL has built-in single-master replication, but unfortunately, there is no multiple-master replication in mainline PostgreSQL. There are some Multimaster replication solutions available...
Statement-Based Replication Middleware Asynchronous Multimaster Replication Synchronous Multimaster Replication Most Common Implementation NAS DRBD Streaming Repl. Slony pgpool-II Bucardo Communication Method shared disk disk blocks WAL table rows SQL table rows table rows and row locks No special hardware re...
具体的可以参考文章: How to achieve multi-master replication in PostgreSQL with Spock 总结 综合考虑复杂性与功能性, 我们最后选择了逻辑复制方案. AWS 有一篇博客专门讲 pglogical 的迁移, 挺不错的: aws.amazon.com/cn/blogs aws.amazon.com/cn/blogs 笔记 Could not open relation with OID 在测试创建...
(pg_current_wal_lsn(),flush_lsn) flush_wal,pg_wal_lsn_diff(pg_current_wal_lsn(),replay_lsn) replay_wal from pg_stat_replication; sent_wal | write_wal | flush_wal | replay_wal ---+---+---+--- 0 | 0 | 0 | 151253816 (1 row) postgres=# 在备库有复制延迟的前提下,提升备...
PostgreSQL天然集群,多个集群可以组成集簇,有点类似军队的连、团、旅这样的组织规则。对于我们日常学习使用的单节点则是单个集簇单个集群,自己就是集群。 PostgreSQL如何管理这种集群规则?答案是通过一个无符号4个字节的标识进行管理,一个对象就是集群里的一个数据库。
One Subscriber can merge changes from several origins and detect conflict between changes with automatic and configurable conflict resolution (some, but not all aspects required for multi-master). Cascading replication is implemented in the form of changeset forwarding. Requirements To use pglogical the...
From experience, we can tell that a multi-GB implicit archive on the master is definitely an investment worth considering. Very low values for wal_keep_segments might be risky and not worth the effort. Nowadays, pace is usually cheap. Small systems might not need this setting, and large ...