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Re: Fwd: How does the partitioned lock manager works?
- From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
- To: rancpine cui <rancpine(at)gmail(dot)com>
- Cc: pgsql-hackers(at)postgresql(dot)org
- Subject: Re: Fwd: How does the partitioned lock manager works?
- Date: Fri, 27 Apr 2007 09:55:24 -0400
rancpine cui escribió: > I've seen from the README that > "The shared-memory hash tables for LOCKs and PROCLOCKs are organized > so that different partitions use different hash chains, and thus there > is no conflict in working with objects in different partitions." > What does "hash chains" mean? Each "hash chain" is a different, separate, independent hash struct. > As the dynahash.c's "partitioned table" mechanism suggests, a lock's > bucket number can be calculated from its hash value, then it will be > inserted into that bucket,so how does partition number works? Which hash is used depends on the partition number. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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