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Bruce Momjian
2001-09-04 15:40:18 +00:00
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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Aug 21 07:05:48 EDT 2001
Last updated: Tue Sep 4 01:14:28 EDT 2001
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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4.22) How do I create a column that will default to the current time?
4.23) Why are my subqueries using IN so slow?
4.24) How do I perform an outer join?
4.25) How do I perform queries using multiple databases?
Extending PostgreSQL
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In PostgreSQL 6.5 and up, the default limit is 32 processes. You can
increase it by restarting the postmaster with a suitable -N value.
With the default configuration you can set -N as large as 1024. If you
need more, increase MAXBACKENDS in include/pg_config.h and rebuild. You
can set the default value of -N at configuration time, if you like,
using configure's --with-maxbackends switch.
need more, increase MAXBACKENDS in include/pg_config.h and rebuild.
You can set the default value of -N at configuration time, if you
like, using configure's --with-maxbackends switch.
Note that if you make -N larger than 32, you must also increase -B
beyond its default of 64; -B must be at least twice -N, and probably
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FROM tab1
WHERE tab1.col1 NOT IN (SELECT tab2.col1 FROM tab2)
ORDER BY col1
4.25) How do I perform queries using multiple databases?
There is no way to query any database except the current one. Because
PostgreSQL loads database-specific system catalogs, it is uncertain
how a cross-database query should even behave.
Of course, a client can make simultaneous connections to different
databases and merge the information that way.
_________________________________________________________________
Extending PostgreSQL