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Update from Ian Barwick

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Bruce Momjian 2004-12-18 04:13:20 +00:00
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Wed Dec 15 20:06:34 EST 2004 Last updated: Fri Dec 17 23:12:56 EST 2004
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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a collection of PostgreSQL technical articles at a collection of PostgreSQL technical articles at
http://techdocs.PostgreSQL.org/. http://techdocs.PostgreSQL.org/.
psql has some nice \d commands to show information about types, The command line client program psql has some \d commands to show
operators, functions, aggregates, etc. information about types, operators, functions, aggregates, etc. - use
\? to display the available commands.
Our web site contains even more documentation. Our web site contains even more documentation.
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reduce lock contention. reduce lock contention.
Performance Performance
PostgreSQL has performance similar to other commercial and open PostgreSQL's performance is comparable to other commercial and
source databases. it is faster for some things, slower for open source databases. It is faster for some things, slower for
others. In comparison to MySQL or leaner database systems, we others. In comparison to MySQL or leaner database systems, we
are faster for multiple users, complex queries, and a are faster for multiple users, complex queries, and a
read/write query load. MySQL is faster for simple SELECT read/write query load. MySQL is faster for simple SELECT
queries done by a few users. Of course, MySQL does not have queries done by a few users. Of course, MySQL does not have
most of the features mentioned in the Features section above. most of the features mentioned in the Features section above.
We are built for reliability and features, and we continue to We are built for reliability and features, and we continue to
improve performance in every release. There is an interesting improve performance in every release.
Web page comparing PostgreSQL to MySQL at
http://openacs.org/philosophy/why-not-mysql.html Also, MySQL is
is a company that distributes its products via open source, and
requires a commercial license for close-source software, not an
open source development community like PostgreSQL.
Reliability Reliability
We realize that a DBMS must be reliable, or it is worthless. We We realize that a DBMS must be reliable, or it is worthless. We
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item is solely to support the PostgreSQL project and does not fund any item is solely to support the PostgreSQL project and does not fund any
specific company. If you prefer, you can also send a check to the specific company. If you prefer, you can also send a check to the
contact address. contact address.
_________________________________________________________________
Also, if you have a success story about PostgreSQL, please submit it Also, if you have a success story about PostgreSQL, please submit it
to our advocacy site at http://advocacy.postgresql.org. to our advocacy site at http://advocacy.postgresql.org.
_________________________________________________________________
User Client Questions User Client Questions
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2.3) Does PostgreSQL have a graphical user interface? 2.3) Does PostgreSQL have a graphical user interface?
Yes, there are several graphical interfaces to PostgreSQL available. Yes, there are several graphical interfaces to PostgreSQL available.
These include PgAccess http://www.pgaccess.org), PgAdmin III These include PgAccess http://www.pgaccess.org), pgAdmin III
(http://www.pgadmin.org, RHDB Admin (http://sources.redhat.com/rhdb/ (http://www.pgadmin.org, RHDB Admin (http://sources.redhat.com/rhdb/
), TORA (http://www.globecom.net/tora/ (partly commercial), and Rekall ), TORA (http://www.globecom.net/tora/ (partly commercial), and Rekall
( http://www.thekompany.com/products/rekall/, proprietary). There is ( http://www.thekompany.com/products/rekall/, proprietary). There is
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exceeded your kernel's limit on shared memory space. Each buffer is 8K exceeded your kernel's limit on shared memory space. Each buffer is 8K
and the default is 1000 buffers. and the default is 1000 buffers.
You can also use the sort_mem and work_mem options to increase the You can also use the sort_mem (from PostgreSQL 8.0: work_mem) options
maximum amount of memory used by the backend processes for each to increase the maximum amount of memory used by the backend processes
temporary sort. The default is 1024 (i.e. 1MB). for each temporary sort. The default is 1024 (i.e. 1MB).
You can also use the CLUSTER command to group data in tables to match You can also use the CLUSTER command to group data in tables to match
an index. See the CLUSTER manual page for more details. an index. See the CLUSTER manual page for more details.
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Finally, you could use the OID returned from the INSERT statement to Finally, you could use the OID returned from the INSERT statement to
look up the default value, though this is probably the least portable look up the default value, though this is probably the least portable
approach, and the oid value will wrap around when it reaches 4 approach, and the oid value will wrap around when it reaches 4
billion. In Perl, using DBI with Edmund Mergl's DBD::Pg module, the billion. In Perl, using DBI with the DBD::Pg module, the oid value is
oid value is made available via $sth->{pg_oid_status} after made available via $sth->{pg_oid_status} after $sth->execute().
$sth->execute().
4.15.3) Doesn't currval() lead to a race condition with other users? 4.15.3) Doesn't currval() lead to a race condition with other users?