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NAME="CATALOG-PG-DATABASE"
>45.15. <TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
></H1
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_database</TT
> stores information about
   the available databases.  Databases are created with the <A
HREF="sql-createdatabase.html"
>CREATE DATABASE</A
> command.
   Consult <A
HREF="managing-databases.html"
>Chapter 21</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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><P
><B
>Table 45-15. <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
>&nbsp;</TD
><TD
>Database name</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datdba</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-authid.html"
><TT
CLASS="STRUCTNAME"
>pg_authid</TT
></A
>.oid</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
>&nbsp;</TD
><TD
>Character encoding for this database
          (<CODE
CLASS="FUNCTION"
>pg_encoding_to_char()</CODE
> can translate
           this number to the encoding name)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datcollate</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>LC_COLLATE for this database</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datctype</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>LC_CTYPE for this database</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datistemplate</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</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
>&nbsp;</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"
>datconnlimit</TT
></TD
><TD
><TT
CLASS="TYPE"
>int4</TT
></TD
><TD
>&nbsp;</TD
><TD
>       Sets maximum number of concurrent connections that can be made
       to this database.  -1 means no limit.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datlastsysoid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
>&nbsp;</TD
><TD
>       Last system OID in the database; useful
       particularly to <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datfrozenxid</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
>&nbsp;</TD
><TD
>       All transaction IDs before this one have been replaced with a permanent
       (<SPAN
CLASS="QUOTE"
>"frozen"</SPAN
>) transaction ID in this database.  This is used to
       track whether the database needs to be vacuumed in order to prevent
       transaction ID wraparound or to allow <TT
CLASS="LITERAL"
>pg_clog</TT
> to be shrunk.
       It is the minimum of the per-table
       <TT
CLASS="STRUCTNAME"
>pg_class</TT
>.<TT
CLASS="STRUCTFIELD"
>relfrozenxid</TT
> values.
      </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"
>datacl</TT
></TD
><TD
><TT
CLASS="TYPE"
>aclitem[]</TT
></TD
><TD
>&nbsp;</TD
><TD
>       Access privileges; see
       <A
HREF="sql-grant.html"
>GRANT</A
> and
       <A
HREF="sql-revoke.html"
>REVOKE</A
>
       for details
      </TD
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