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diff --git a/doc/src/sgml/html/catalog-pg-shdepend.html b/doc/src/sgml/html/catalog-pg-shdepend.html new file mode 100644 index 0000000..0cf67cf --- /dev/null +++ b/doc/src/sgml/html/catalog-pg-shdepend.html @@ -0,0 +1,98 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>53.48. pg_shdepend</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="catalog-pg-sequence.html" title="53.47. pg_sequence" /><link rel="next" href="catalog-pg-shdescription.html" title="53.49. pg_shdescription" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">53.48. <code class="structname">pg_shdepend</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-sequence.html" title="53.47. pg_sequence">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 53. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-shdescription.html" title="53.49. pg_shdescription">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-SHDEPEND"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.48. <code class="structname">pg_shdepend</code></h2></div></div></div><a id="id-1.10.4.50.2" class="indexterm"></a><p> + The catalog <code class="structname">pg_shdepend</code> 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 class="link" href="catalog-pg-depend.html" title="53.18. pg_depend"><code class="structname">pg_depend</code></a>, + which performs a similar function for dependencies involving objects + within a single database. + </p><p> + Unlike most system catalogs, <code class="structname">pg_shdepend</code> + is shared across all databases of a cluster: there is only one + copy of <code class="structname">pg_shdepend</code> per cluster, not + one per database. + </p><div class="table" id="id-1.10.4.50.6"><p class="title"><strong>Table 53.48. <code class="structname">pg_shdepend</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_shdepend Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition"> + Column Type + </p> + <p> + Description + </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">dbid</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-database.html" title="53.15. pg_database"><code class="structname">pg_database</code></a>.<code class="structfield">oid</code>) + </p> + <p> + The OID of the database the dependent object is in, + or zero for a shared object + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">classid</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-class.html" title="53.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>) + </p> + <p> + The OID of the system catalog the dependent object is in + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">objid</code> <code class="type">oid</code> + (references any OID column) + </p> + <p> + The OID of the specific dependent object + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">objsubid</code> <code class="type">int4</code> + </p> + <p> + For a table column, this is the column number (the + <code class="structfield">objid</code> and <code class="structfield">classid</code> refer to the + table itself). For all other object types, this column is zero. + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">refclassid</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-class.html" title="53.11. pg_class"><code class="structname">pg_class</code></a>.<code class="structfield">oid</code>) + </p> + <p> + The OID of the system catalog the referenced object is in + (must be a shared catalog) + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">refobjid</code> <code class="type">oid</code> + (references any OID column) + </p> + <p> + The OID of the specific referenced object + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">deptype</code> <code class="type">char</code> + </p> + <p> + A code defining the specific semantics of this dependency relationship; see text + </p></td></tr></tbody></table></div></div><br class="table-break" /><p> + In all cases, a <code class="structname">pg_shdepend</code> entry indicates that + the referenced object cannot be dropped without also dropping the dependent + object. However, there are several subflavors identified by + <code class="structfield">deptype</code>: + + </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="symbol">SHARED_DEPENDENCY_OWNER</code> (<code class="literal">o</code>)</span></dt><dd><p> + The referenced object (which must be a role) is the owner of the + dependent object. + </p></dd><dt><span class="term"><code class="symbol">SHARED_DEPENDENCY_ACL</code> (<code class="literal">a</code>)</span></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 <code class="symbol">SHARED_DEPENDENCY_ACL</code> entry is + not made for the owner of the object, since the owner will have + a <code class="symbol">SHARED_DEPENDENCY_OWNER</code> entry anyway.) + </p></dd><dt><span class="term"><code class="symbol">SHARED_DEPENDENCY_POLICY</code> (<code class="literal">r</code>)</span></dt><dd><p> + The referenced object (which must be a role) is mentioned as the + target of a dependent policy object. + </p></dd><dt><span class="term"><code class="symbol">SHARED_DEPENDENCY_TABLESPACE</code> (<code class="literal">t</code>)</span></dt><dd><p> + The referenced object (which must be a tablespace) is mentioned as + the tablespace for a relation that doesn't have storage. + </p></dd></dl></div><p> + + Other dependency flavors might be needed in future. Note in particular + that the current definition only supports roles and tablespaces as referenced + objects. + </p><p> + As in the <code class="structname">pg_depend</code> catalog, most objects + created during <span class="application">initdb</span> are + considered <span class="quote">“<span class="quote">pinned</span>”</span>. No entries are made + in <code class="structname">pg_shdepend</code> that would have a pinned + object as either referenced or dependent object. + </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-sequence.html" title="53.47. pg_sequence">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-shdescription.html" title="53.49. pg_shdescription">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.47. <code class="structname">pg_sequence</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.49. <code class="structname">pg_shdescription</code></td></tr></table></div></body></html>
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