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><A
NAME="CATALOG-PG-DATABASE"
>41.12. <TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
></H1
><A
NAME="AEN53174"
></A
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_database</TT
> stores information
about the available databases. Databases are created with the
<TT
CLASS="COMMAND"
>CREATE DATABASE</TT
> command. Consult
<A
HREF="managing-databases.html"
>Chapter 18</A
> for details about the meaning of some of the
parameters.
</P
><P
> Unlike most system catalogs, <TT
CLASS="STRUCTNAME"
>pg_database</TT
>
is shared across all databases of a cluster: there is only one
copy of <TT
CLASS="STRUCTNAME"
>pg_database</TT
> per cluster, not
one per database.
</P
><DIV
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><A
NAME="AEN53183"
></A
><P
><B
>Table 41-12. <TT
CLASS="STRUCTNAME"
>pg_database</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
> </TD
><TD
>Database name</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datdba</TT
></TD
><TD
><TT
CLASS="TYPE"
>int4</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-shadow.html"
><TT
CLASS="STRUCTNAME"
>pg_shadow</TT
></A
>.usesysid</TT
></TD
><TD
>Owner of the database, usually the user who created it</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>encoding</TT
></TD
><TD
><TT
CLASS="TYPE"
>int4</TT
></TD
><TD
> </TD
><TD
>Character encoding for this database</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datistemplate</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
> If true then this database can be used in the
<TT
CLASS="LITERAL"
>TEMPLATE</TT
> clause of <TT
CLASS="COMMAND"
>CREATE
DATABASE</TT
> to create a new database as a clone of
this one.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datallowconn</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
> </TD
><TD
> If false then no one can connect to this database. This is
used to protect the <TT
CLASS="LITERAL"
>template0</TT
> database from being altered.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datlastsysoid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
> </TD
><TD
> Last system OID in the database; useful
particularly to <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datvacuumxid</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
> </TD
><TD
> All rows inserted or deleted by transaction IDs before this one
have been marked as known committed or known aborted in this database.
This is used to determine when commit-log space can be recycled.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datfrozenxid</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
> </TD
><TD
> All rows inserted by transaction IDs before this one have been
relabeled with a permanent (<SPAN
CLASS="QUOTE"
>"frozen"</SPAN
>) transaction ID in this
database. This is useful to check whether a database must be vacuumed
soon to avoid transaction ID wrap-around problems.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>dattablespace</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-tablespace.html"
><TT
CLASS="STRUCTNAME"
>pg_tablespace</TT
></A
>.oid</TT
></TD
><TD
> The default tablespace for the database.
Within this database, all tables for which
<TT
CLASS="STRUCTNAME"
>pg_class</TT
>.<TT
CLASS="STRUCTFIELD"
>reltablespace</TT
> is zero
will be stored in this tablespace; in particular, all the non-shared
system catalogs will be there.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datconfig</TT
></TD
><TD
><TT
CLASS="TYPE"
>text[]</TT
></TD
><TD
> </TD
><TD
>Session defaults for run-time configuration variables</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datacl</TT
></TD
><TD
><TT
CLASS="TYPE"
>aclitem[]</TT
></TD
><TD
> </TD
><TD
> Access privileges; see
<A
HREF="sql-grant.html"
><I
>GRANT</I
></A
> and
<A
HREF="sql-revoke.html"
><I
>REVOKE</I
></A
>
for details.
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