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><A
NAME="CATALOG-PG-SHDEPEND"
>45.39. <TT
CLASS="STRUCTNAME"
>pg_shdepend</TT
></A
></H1
><P
> The catalog <TT
CLASS="STRUCTNAME"
>pg_shdepend</TT
> records the
dependency relationships between database objects and shared objects,
such as roles. This information allows
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> to ensure that those objects are
unreferenced before attempting to delete them.
</P
><P
> See also <A
HREF="catalog-pg-depend.html"
><TT
CLASS="STRUCTNAME"
>pg_depend</TT
></A
>,
which performs a similar function for dependencies involving objects
within a single database.
</P
><P
> Unlike most system catalogs, <TT
CLASS="STRUCTNAME"
>pg_shdepend</TT
>
is shared across all databases of a cluster: there is only one
copy of <TT
CLASS="STRUCTNAME"
>pg_shdepend</TT
> per cluster, not
one per database.
</P
><DIV
CLASS="TABLE"
><A
NAME="AEN92476"
></A
><P
><B
>Table 45-39. <TT
CLASS="STRUCTNAME"
>pg_shdepend</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"
>dbid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
>.oid</TT
></TD
><TD
>The OID of the database the dependent object is in,
or zero for a shared object</TD
></TR
><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
(must be a shared catalog)</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"
>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_shdepend</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"
>SHARED_DEPENDENCY_OWNER</TT
> (<TT
CLASS="LITERAL"
>o</TT
>)</DT
><DD
><P
> The referenced object (which must be a role) is the owner of the
dependent object.
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>SHARED_DEPENDENCY_ACL</TT
> (<TT
CLASS="LITERAL"
>a</TT
>)</DT
><DD
><P
> The referenced object (which must be a role) is mentioned in the
ACL (access control list, i.e., privileges list) of the
dependent object. (A <TT
CLASS="SYMBOL"
>SHARED_DEPENDENCY_ACL</TT
> entry is
not made for the owner of the object, since the owner will have
a <TT
CLASS="SYMBOL"
>SHARED_DEPENDENCY_OWNER</TT
> entry anyway.)
</P
></DD
><DT
><TT
CLASS="SYMBOL"
>SHARED_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. Note in particular
that the current definition only supports roles as referenced objects.
</P
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