Here is an updated version of the "lazy vxid locks" patch [1], which
applies over the latest "reduce the overhead of frequent table
locks"[2] patch.
[1] https://commitfest.postgresql.org/action/patch_view?id=585
[2] https://commitfest.postgresql.org/action/patch_view?id=572
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Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company