PostgreSQL 8.4.19 Documentation
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# E.83. Release 8.1.9

> Release date: 2007-04-23

This release contains a variety of fixes from 8.1.8, including a security fix. For information about new features in the 8.1 major release, see Section E.92.

## E.83.1. Migration to Version 8.1.9

A dump/restore is not required for those running 8.1.X. However, if you are upgrading from a version earlier than 8.1.2, see the release notes for 8.1.2.

## E.83.2. Changes

- Support explicit placement of the temporary-table schema within `search_path`, and disable searching it for functions and operators (Tom)

  This is needed to allow a security-definer function to set a truly secure value of `search_path`. Without it, an unprivileged SQL user can use temporary objects to execute code with the privileges of the security-definer function (CVE-2007-2138). See `CREATE FUNCTION` for more information.

- `/contrib/tsearch2` crash fixes (Teodor)

- Require `COMMIT PREPARED` to be executed in the same database as the transaction was prepared in (Heikki)

- Fix potential-data-corruption bug in how `VACUUM FULL` handles `UPDATE` chains (Tom, Pavan Deolasee)

- Planner fixes, including improving outer join and bitmap scan selection logic (Tom)

- Fix PANIC during enlargement of a hash index (bug introduced in 8.1.6) (Tom)

- Fix POSIX-style timezone specs to follow new USA DST rules (Tom)

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