A couple of questions regarding REINDEX command:
Running PostgreSQL 7.4.2 on Solaris.
1) When is it necessary to run REINDEX or drop/create
an index? All I could really find in the docs is:
"In some situations it is worthwhile to rebuild
indexes periodically with the REINDEX command. (There
is also contrib/reindexdb which can reindex an entire
database.) However, PostgreSQL 7.4 has substantially
reduced the need for this activity compared to earlier
What are these situations? We have a database with
some large tables. Currently we reindex (actually
drop/create) nightly. But as the tables have grown
this has become prohibitively time-consuming.
According to the above comment it may not be necessary
2) If reindexing is necessary, how can this be done in
a non-obtrusive way in a production environment. Our
database is being updated constantly. REINDEX locks
client apps out while in progress. Same with "CREATE
INDEX" when we drop/create. The table can have over
10 million row. Recreating the indexes seems to take
hours. This is too long to lock the client apps out.
Is there any other solution?
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