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| author | Bruce Momjian <bruce@momjian.us> | 2002-06-21 02:01:04 +0000 |
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| committer | Bruce Momjian <bruce@momjian.us> | 2002-06-21 02:01:04 +0000 |
| commit | 8188474a5c9b5a87522a04a357e92155c0f2e7a6 (patch) | |
| tree | 549f07637127dca3dd032f8222aabdecf4a5fcad /doc/FAQ | |
| parent | bed81bcbeca7fe983036165546efd7e5330fe9b0 (diff) | |
| download | postgresql-8188474a5c9b5a87522a04a357e92155c0f2e7a6.tar.gz postgresql-8188474a5c9b5a87522a04a357e92155c0f2e7a6.zip | |
Update FAQ.
Diffstat (limited to 'doc/FAQ')
| -rw-r--r-- | doc/FAQ | 21 |
1 files changed, 20 insertions, 1 deletions
@@ -1,7 +1,7 @@ Frequently Asked Questions (FAQ) for PostgreSQL - Last updated: Tue Jun 11 06:36:10 EDT 2002 + Last updated: Thu Jun 20 22:00:57 EDT 2002 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) @@ -53,6 +53,7 @@ 3.7) What debugging features are available? 3.8) Why do I get "Sorry, too many clients" when trying to connect? 3.9) What are the pg_sorttempNNN.NN files in my database directory? + 3.10) Why do I need to do a dump and restore to upgrade PostgreSQL? Operational Questions @@ -596,6 +597,24 @@ The temporary files should be deleted automatically, but might not if a backend crashes during a sort. If you have no backends running at the time, it is safe to delete the pg_tempNNN.NN files. + + 3.10) Why do I need to do a dump and restore to upgrade PostgreSQL? + + The PostgreSQL team tries very heard to maintain compatability across + minor releases. So upgrading from 7.2 to 7.2.1 does not require a dump + a restore. However, new features are continuously being adding and + sometimes this requires new fields to be added to system tables. + + These changes may be across many tables and so maintaining backward + compatability would be quite difficult. Thus, restoring from a dump is + required to make everything work. + + Note that the actual on-disk file format does not change very often, a + feature the pg_upgrade script uses quite successfully. There the dump + is used create the necessary information in the system tables. The + data files are then just copied across. This method is not as + guarenteed as the dump/restore method but when it works it can make + upgrades very efficient. _________________________________________________________________ Operational Questions |