PostgreSQL 9.1.14 Documentation
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# E.172. Release 7.4.15

> Release Date: 2007-01-08

This release contains a variety of fixes from 7.4.14. For information about new features in the 7.4 major release, see Section E.187.

## E.172.1. Migration to Version 7.4.15

A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.11, see Section E.176.

## E.172.2. Changes

- Improve handling of `getaddrinfo()` on AIX (Tom)

  This fixes a problem with starting the statistics collector, among other things.

- Fix "failed to re-find parent key" errors in `VACUUM` (Tom)

- Fix bugs affecting multi-gigabyte hash indexes (Tom)

- Fix error when constructing an `ARRAY[]` made up of multiple empty elements (Tom)

- `to_number()` and `to_char(numeric)` are now `STABLE`, not `IMMUTABLE`, for new initdb installs (Tom)

  This is because `lc_numeric` can potentially change the output of these functions.

- Improve index usage of regular expressions that use parentheses (Tom)

  This improves psql `\d` performance also.

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