Tom Lane wrote:

> The only reason we have memory contexts at all is to avoid the need to
> track individual palloc'd objects. Since we're instituting exactly such
> tracking for snapshots, there's no value in placing them in
> general-purpose memory contexts.

FWIW I noticed yesterday after going to bed that SnapshotContext serves
no useful purpose -- we can just remove it and store snaps in
TopTransactionContext.

--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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