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><A
NAME="CATALOG-PG-DEPEND"
>45.18. <TT
CLASS="STRUCTNAME"
>pg_depend</TT
></A
></H1
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_depend</TT
> records the dependency
relationships between database objects. This information allows
<TT
CLASS="COMMAND"
>DROP</TT
> commands to find which other objects must be dropped
by <TT
CLASS="COMMAND"
>DROP CASCADE</TT
> or prevent dropping in the <TT
CLASS="COMMAND"
>DROP
RESTRICT</TT
> case.
</P
><P
> See also <A
HREF="catalog-pg-shdepend.html"
><TT
CLASS="STRUCTNAME"
>pg_shdepend</TT
></A
>,
which performs a similar function for dependencies involving objects
that are shared across a database cluster.
</P
><DIV
CLASS="TABLE"
><A
NAME="AEN90570"
></A
><P
><B
>Table 45-18. <TT
CLASS="STRUCTNAME"
>pg_depend</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"
>classid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The OID of the system catalog the dependent object is in</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>objid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
>any OID column</TD
><TD
>The OID of the specific dependent object</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>objsubid</TT
></TD
><TD
><TT
CLASS="TYPE"
>int4</TT
></TD
><TD
> </TD
><TD
> For a table column, this is the column number (the
<TT
CLASS="STRUCTFIELD"
>objid</TT
> and <TT
CLASS="STRUCTFIELD"
>classid</TT
> refer to the
table itself). For all other object types, this column is
zero.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>refclassid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>The OID of the system catalog the referenced object is in</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>refobjid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
>any OID column</TD
><TD
>The OID of the specific referenced object</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>refobjsubid</TT
></TD
><TD
><TT
CLASS="TYPE"
>int4</TT
></TD
><TD
> </TD
><TD
> For a table column, this is the column number (the
<TT
CLASS="STRUCTFIELD"
>refobjid</TT
> and <TT
CLASS="STRUCTFIELD"
>refclassid</TT
> refer
to the table itself). For all other object types, this column
is zero.
</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>deptype</TT
></TD
><TD
><TT
CLASS="TYPE"
>char</TT
></TD
><TD
> </TD
><TD
> A code defining the specific semantics of this dependency relationship; see text
</TD
></TR
></TBODY
></TABLE
></DIV
><P
> In all cases, a <TT
CLASS="STRUCTNAME"
>pg_depend</TT
> entry indicates that the
referenced object cannot be dropped without also dropping the dependent
object. However, there are several subflavors identified by
<TT
CLASS="STRUCTFIELD"
>deptype</TT
>:
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="SYMBOL"
>DEPENDENCY_NORMAL</TT
> (<TT
CLASS="LITERAL"
>n</TT
>)</DT
><DD
><P
> A normal relationship between separately-created objects. The
dependent object can be dropped without affecting the
referenced object. The referenced object can only be dropped
by specifying <TT
CLASS="LITERAL"
>CASCADE</TT
>, in which case the dependent
object is dropped, too. Example: a table column has a normal
dependency on its data type.
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>DEPENDENCY_AUTO</TT
> (<TT
CLASS="LITERAL"
>a</TT
>)</DT
><DD
><P
> The dependent object can be dropped separately from the
referenced object, and should be automatically dropped
(regardless of <TT
CLASS="LITERAL"
>RESTRICT</TT
> or <TT
CLASS="LITERAL"
>CASCADE</TT
>
mode) if the referenced object is dropped. Example: a named
constraint on a table is made autodependent on the table, so
that it will go away if the table is dropped.
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>DEPENDENCY_INTERNAL</TT
> (<TT
CLASS="LITERAL"
>i</TT
>)</DT
><DD
><P
> The dependent object was created as part of creation of the
referenced object, and is really just a part of its internal
implementation. A <TT
CLASS="COMMAND"
>DROP</TT
> of the dependent object
will be disallowed outright (we'll tell the user to issue a
<TT
CLASS="COMMAND"
>DROP</TT
> against the referenced object, instead). A
<TT
CLASS="COMMAND"
>DROP</TT
> of the referenced object will be propagated
through to drop the dependent object whether
<TT
CLASS="COMMAND"
>CASCADE</TT
> is specified or not. Example: a trigger
that's created to enforce a foreign-key constraint is made
internally dependent on the constraint's
<TT
CLASS="STRUCTNAME"
>pg_constraint</TT
> entry.
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>DEPENDENCY_EXTENSION</TT
> (<TT
CLASS="LITERAL"
>e</TT
>)</DT
><DD
><P
> The dependent object is a member of the <I
CLASS="FIRSTTERM"
>extension</I
> that is
the referenced object (see
<A
HREF="catalog-pg-extension.html"
><TT
CLASS="STRUCTNAME"
>pg_extension</TT
></A
>).
The dependent object can be dropped only via
<TT
CLASS="COMMAND"
>DROP EXTENSION</TT
> on the referenced object. Functionally
this dependency type acts the same as an internal dependency, but
it's kept separate for clarity and to simplify <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>.
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>DEPENDENCY_PIN</TT
> (<TT
CLASS="LITERAL"
>p</TT
>)</DT
><DD
><P
> There is no dependent object; this type of entry is a signal
that the system itself depends on the referenced object, and so
that object must never be deleted. Entries of this type are
created only by <TT
CLASS="COMMAND"
>initdb</TT
>. The columns for the
dependent object contain zeroes.
</P
></DD
></DL
></DIV
><P>
Other dependency flavors might be needed in future.
</P
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