Release 8.1.16

PostgreSQL 9.2.3 Documentation
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# E.99. Release 8.1.16

> Release Date: 2009-02-02

This release contains a variety of fixes from 8.1.15. For information about new features in the 8.1 major release, see Section E.115.

## E.99.1. Migration to Version 8.1.16

A dump/restore is not required for those running 8.1.X. However, if you are upgrading from a version earlier than 8.1.15, see the release notes for 8.1.15.

## E.99.2. Changes

- Fix crash in autovacuum (Alvaro)

  The crash occurs only after vacuuming a whole database for anti-transaction-wraparound purposes, which means that it occurs infrequently and is hard to track down.

- Improve handling of URLs in `headline()` function (Teodor)

- Improve handling of overlength headlines in `headline()` function (Teodor)

- Prevent possible Assert failure or misconversion if an encoding conversion is created with the wrong conversion function for the specified pair of encodings (Tom, Heikki)

- Avoid unnecessary locking of small tables in `VACUUM` (Heikki)

- Ensure that the contents of a holdable cursor don't depend on the contents of TOAST tables (Tom)

  Previously, large field values in a cursor result might be represented as TOAST pointers, which would fail if the referenced table got dropped before the cursor is read, or if the large value is deleted and then vacuumed away. This cannot happen with an ordinary cursor, but it could with a cursor that is held past its creating transaction.

- Fix uninitialized variables in `contrib/tsearch2`'s `get_covers()` function (Teodor)

- Fix configure script to properly report failure when unable to obtain linkage information for PL/Perl (Andrew)

- Make all documentation reference `pgsql-bugs` and/or `pgsql-hackers` as appropriate, instead of the now-decommissioned `pgsql-ports` and `pgsql-patches` mailing lists (Tom)

- Update time zone data files to tzdata release 2009a (for Kathmandu and historical DST corrections in Switzerland, Cuba)

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