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Instead of entering them on transaction startup, we materialize them only when someone wants to wait, which will occur only during CREATE INDEX CONCURRENTLY. In Hot Standby mode, the startup process must also be able to probe for conflicting VXID locks, but the lock need never be fully materialized, because the startup process does not use the normal lock wait mechanism. Since most VXID locks never need to touch the lock manager partition locks, this can significantly reduce blocking contention on read-heavy workloads. Patch by me. Review by Jeff Davis.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.