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When we have many and many PostgreSQL Databases, these database's wal archive manage will much complex. We must has a simple manage tool to do it, and it can help us find these databases archive history, analyze which database will use more and which database use few storage to record the wal files. And this tool must can manage these infomation and use storage properly.
Linux's system activity information from sar, this project will use postgresql manage bulk Linux hosts. These hosts registed in postgresql, and every day load it's sar info into postgresql, and use postgresql's SQL analyze the hosts performance, like performance's system activity information and TOP resource consume's hosts, and so on.
Use PostgreSQL function provide unique Application monitor interface. applications call postgresql function, send status message to it. nagios read the message from postgresql.
PostgreSQL HA via three host, include two postgresql (primary and stream replication standby) and one vote host.