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postgresql-docs-8.0.11-0.1.20060mdk.x86_64.rpm

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>PostgreSQL 8.0.11 Documentation</TH
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><DIV
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><H1
><A
NAME="CATALOGS"
></A
>Chapter 41. System Catalogs</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>41.1. <A
HREF="catalogs.html#CATALOGS-OVERVIEW"
>Overview</A
></DT
><DT
>41.2. <A
HREF="catalog-pg-aggregate.html"
><TT
CLASS="STRUCTNAME"
>pg_aggregate</TT
></A
></DT
><DT
>41.3. <A
HREF="catalog-pg-am.html"
><TT
CLASS="STRUCTNAME"
>pg_am</TT
></A
></DT
><DT
>41.4. <A
HREF="catalog-pg-amop.html"
><TT
CLASS="STRUCTNAME"
>pg_amop</TT
></A
></DT
><DT
>41.5. <A
HREF="catalog-pg-amproc.html"
><TT
CLASS="STRUCTNAME"
>pg_amproc</TT
></A
></DT
><DT
>41.6. <A
HREF="catalog-pg-attrdef.html"
><TT
CLASS="STRUCTNAME"
>pg_attrdef</TT
></A
></DT
><DT
>41.7. <A
HREF="catalog-pg-attribute.html"
><TT
CLASS="STRUCTNAME"
>pg_attribute</TT
></A
></DT
><DT
>41.8. <A
HREF="catalog-pg-cast.html"
><TT
CLASS="STRUCTNAME"
>pg_cast</TT
></A
></DT
><DT
>41.9. <A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
></DT
><DT
>41.10. <A
HREF="catalog-pg-constraint.html"
><TT
CLASS="STRUCTNAME"
>pg_constraint</TT
></A
></DT
><DT
>41.11. <A
HREF="catalog-pg-conversion.html"
><TT
CLASS="STRUCTNAME"
>pg_conversion</TT
></A
></DT
><DT
>41.12. <A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
></DT
><DT
>41.13. <A
HREF="catalog-pg-depend.html"
><TT
CLASS="STRUCTNAME"
>pg_depend</TT
></A
></DT
><DT
>41.14. <A
HREF="catalog-pg-description.html"
><TT
CLASS="STRUCTNAME"
>pg_description</TT
></A
></DT
><DT
>41.15. <A
HREF="catalog-pg-group.html"
><TT
CLASS="STRUCTNAME"
>pg_group</TT
></A
></DT
><DT
>41.16. <A
HREF="catalog-pg-index.html"
><TT
CLASS="STRUCTNAME"
>pg_index</TT
></A
></DT
><DT
>41.17. <A
HREF="catalog-pg-inherits.html"
><TT
CLASS="STRUCTNAME"
>pg_inherits</TT
></A
></DT
><DT
>41.18. <A
HREF="catalog-pg-language.html"
><TT
CLASS="STRUCTNAME"
>pg_language</TT
></A
></DT
><DT
>41.19. <A
HREF="catalog-pg-largeobject.html"
><TT
CLASS="STRUCTNAME"
>pg_largeobject</TT
></A
></DT
><DT
>41.20. <A
HREF="catalog-pg-listener.html"
><TT
CLASS="STRUCTNAME"
>pg_listener</TT
></A
></DT
><DT
>41.21. <A
HREF="catalog-pg-namespace.html"
><TT
CLASS="STRUCTNAME"
>pg_namespace</TT
></A
></DT
><DT
>41.22. <A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
></DT
><DT
>41.23. <A
HREF="catalog-pg-operator.html"
><TT
CLASS="STRUCTNAME"
>pg_operator</TT
></A
></DT
><DT
>41.24. <A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
></DT
><DT
>41.25. <A
HREF="catalog-pg-rewrite.html"
><TT
CLASS="STRUCTNAME"
>pg_rewrite</TT
></A
></DT
><DT
>41.26. <A
HREF="catalog-pg-shadow.html"
><TT
CLASS="STRUCTNAME"
>pg_shadow</TT
></A
></DT
><DT
>41.27. <A
HREF="catalog-pg-statistic.html"
><TT
CLASS="STRUCTNAME"
>pg_statistic</TT
></A
></DT
><DT
>41.28. <A
HREF="catalog-pg-tablespace.html"
><TT
CLASS="STRUCTNAME"
>pg_tablespace</TT
></A
></DT
><DT
>41.29. <A
HREF="catalog-pg-trigger.html"
><TT
CLASS="STRUCTNAME"
>pg_trigger</TT
></A
></DT
><DT
>41.30. <A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
></DT
><DT
>41.31. <A
HREF="views-overview.html"
>System Views</A
></DT
><DT
>41.32. <A
HREF="view-pg-indexes.html"
><TT
CLASS="STRUCTNAME"
>pg_indexes</TT
></A
></DT
><DT
>41.33. <A
HREF="view-pg-locks.html"
><TT
CLASS="STRUCTNAME"
>pg_locks</TT
></A
></DT
><DT
>41.34. <A
HREF="view-pg-rules.html"
><TT
CLASS="STRUCTNAME"
>pg_rules</TT
></A
></DT
><DT
>41.35. <A
HREF="view-pg-settings.html"
><TT
CLASS="STRUCTNAME"
>pg_settings</TT
></A
></DT
><DT
>41.36. <A
HREF="view-pg-stats.html"
><TT
CLASS="STRUCTNAME"
>pg_stats</TT
></A
></DT
><DT
>41.37. <A
HREF="view-pg-tables.html"
><TT
CLASS="STRUCTNAME"
>pg_tables</TT
></A
></DT
><DT
>41.38. <A
HREF="view-pg-user.html"
><TT
CLASS="STRUCTNAME"
>pg_user</TT
></A
></DT
><DT
>41.39. <A
HREF="view-pg-views.html"
><TT
CLASS="STRUCTNAME"
>pg_views</TT
></A
></DT
></DL
></DIV
><P
>   The system catalogs are the place where a relational database
   management system stores schema metadata, such as information about
   tables and columns, and internal bookkeeping information.
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>'s system catalogs are regular
   tables.  You can drop and recreate the tables, add columns, insert
   and update values, and severely mess up your system that way.
   Normally, one should not change the system catalogs by hand, there
   are always SQL commands to do that.  (For example, <TT
CLASS="COMMAND"
>CREATE
   DATABASE</TT
> inserts a row into the
   <TT
CLASS="STRUCTNAME"
>pg_database</TT
> catalog &mdash; and actually
   creates the database on disk.)  There are some exceptions for
   particularly esoteric operations, such as adding index access methods.
  </P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="CATALOGS-OVERVIEW"
>41.1. Overview</A
></H1
><P
>   <A
HREF="catalogs.html#CATALOG-TABLE"
>Table 41-1</A
> lists the system catalogs.
   More detailed documentation of each catalog follows below.
  </P
><P
>   Most system catalogs are copied from the template database during
   database creation and are thereafter database-specific. A few
   catalogs are physically shared across all databases in a cluster;
   these are noted in the descriptions of the individual catalogs.
  </P
><DIV
CLASS="TABLE"
><A
NAME="CATALOG-TABLE"
></A
><P
><B
>Table 41-1. System Catalogs</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Catalog Name</TH
><TH
>Purpose</TH
></TR
></THEAD
><TBODY
><TR
><TD
><A
HREF="catalog-pg-aggregate.html"
><TT
CLASS="STRUCTNAME"
>pg_aggregate</TT
></A
></TD
><TD
>aggregate functions</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-am.html"
><TT
CLASS="STRUCTNAME"
>pg_am</TT
></A
></TD
><TD
>index access methods</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-amop.html"
><TT
CLASS="STRUCTNAME"
>pg_amop</TT
></A
></TD
><TD
>access method operators</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-amproc.html"
><TT
CLASS="STRUCTNAME"
>pg_amproc</TT
></A
></TD
><TD
>access method support procedures</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-attrdef.html"
><TT
CLASS="STRUCTNAME"
>pg_attrdef</TT
></A
></TD
><TD
>column default values</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-attribute.html"
><TT
CLASS="STRUCTNAME"
>pg_attribute</TT
></A
></TD
><TD
>table columns (<SPAN
CLASS="QUOTE"
>"attributes"</SPAN
>)</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-cast.html"
><TT
CLASS="STRUCTNAME"
>pg_cast</TT
></A
></TD
><TD
>casts (data type conversions)</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
></TD
><TD
>tables, indexes, sequences, views (<SPAN
CLASS="QUOTE"
>"relations"</SPAN
>)</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-constraint.html"
><TT
CLASS="STRUCTNAME"
>pg_constraint</TT
></A
></TD
><TD
>check constraints, unique constraints, primary key constraints, foreign key constraints</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-conversion.html"
><TT
CLASS="STRUCTNAME"
>pg_conversion</TT
></A
></TD
><TD
>encoding conversion information</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
></TD
><TD
>databases within this database cluster</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-depend.html"
><TT
CLASS="STRUCTNAME"
>pg_depend</TT
></A
></TD
><TD
>dependencies between database objects</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-description.html"
><TT
CLASS="STRUCTNAME"
>pg_description</TT
></A
></TD
><TD
>descriptions or comments on database objects</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-group.html"
><TT
CLASS="STRUCTNAME"
>pg_group</TT
></A
></TD
><TD
>groups of database users</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-index.html"
><TT
CLASS="STRUCTNAME"
>pg_index</TT
></A
></TD
><TD
>additional index information</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-inherits.html"
><TT
CLASS="STRUCTNAME"
>pg_inherits</TT
></A
></TD
><TD
>table inheritance hierarchy</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-language.html"
><TT
CLASS="STRUCTNAME"
>pg_language</TT
></A
></TD
><TD
>languages for writing functions</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-largeobject.html"
><TT
CLASS="STRUCTNAME"
>pg_largeobject</TT
></A
></TD
><TD
>large objects</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-listener.html"
><TT
CLASS="STRUCTNAME"
>pg_listener</TT
></A
></TD
><TD
>asynchronous notification support</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-namespace.html"
><TT
CLASS="STRUCTNAME"
>pg_namespace</TT
></A
></TD
><TD
>schemas</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
></TD
><TD
>index access method operator classes</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-operator.html"
><TT
CLASS="STRUCTNAME"
>pg_operator</TT
></A
></TD
><TD
>operators</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
></TD
><TD
>functions and procedures</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-rewrite.html"
><TT
CLASS="STRUCTNAME"
>pg_rewrite</TT
></A
></TD
><TD
>query rewrite rules</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-shadow.html"
><TT
CLASS="STRUCTNAME"
>pg_shadow</TT
></A
></TD
><TD
>database users</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-statistic.html"
><TT
CLASS="STRUCTNAME"
>pg_statistic</TT
></A
></TD
><TD
>planner statistics</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-tablespace.html"
><TT
CLASS="STRUCTNAME"
>pg_tablespace</TT
></A
></TD
><TD
>tablespaces within this database cluster</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-trigger.html"
><TT
CLASS="STRUCTNAME"
>pg_trigger</TT
></A
></TD
><TD
>triggers</TD
></TR
><TR
><TD
><A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
></TD
><TD
>data types</TD
></TR
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