postgresql 数据库如何集群？

kfping

请问postgresql数据库如何做集群？

网站哪里有资料啊。。。。

/\得/\愛る

顶。。。。

star.bj

postgresql也能集群？

小把戏

8.3非常简单

Magicloud

原帖由 小把戏 于 2008-5-8 16:14 发表
8.3非常简单

How?

baif

曰公司不是说这样的功能只给有钱的人用吗?

chasfer

使用pgpool ii配置postgresql的集群，简单又好用！致于资料嘛，最好的当然是她的帮助文档了

Magicloud

拜托，在若干独立相同数据库前边套个均衡就叫集群了？

baif

原帖由 Magicloud 于 2008-6-6 11:40 发表
拜托，在若干独立相同数据库前边套个均衡就叫集群了？

There is a long way to the ideal world...

What is pgpool-II?
pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It provides the following features.
Limiting Exceeding Connections
There is a limit on the maximum number of concurrent connections with PostgreSQL, and connections are rejected after this many connections. Setting the maximum number of connections, however, increases resource consumption and affect system performance. pgpool-II also has a limit on the maximum number of connections, but extra connections will be queued instead of returning an error immediately.
Connection Pooling
pgpool-II saves connections to the PostgreSQL servers, and reuse them whenever a new connection with the same properties (i.e. username, database, protocol version) comes in. It reduces connection overhead, and improves system's overall throughput.
Replication
pgpool-II can manage multiple PostgreSQL servers. Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure.
Load Balance
If a database is replicated, executing a SELECT query on any server will return the same result. pgpool-II takes an advantage of the replication feature to reduce the load on each PostgreSQL server by distributing SELECT queries among multiple servers, improving system's overall throughput. At best, performance improves proportionally to the number of PostgreSQL servers. Load balance works best in a situation where there are a lot of users executing many queries at the same time.
Parallel Query
Using the parallel query function, data can be divided among the multiple servers, so that a query can be executed on all the servers concurrently to reduce the overall execution time. Parallel query works the best when searching large-scale data.
pgpool-II talks PostgreSQL's backend and frontend protocol, and relays a connection between them. Therefore, a database application (frontend) thinks that pgpool-II is the actual PostgreSQL server, and the server (backend) sees pgpool-II as one of its clients. Because pgpool-II is transparent to both the server and the client, an existing database application can be used with pgpool-II almost without a change to its sources.

BruceShea

我靠！长见识了！