Sophie: postgresql9.6-docs-9.6.22-1.mga7 noarch

postgresql9.6-docs-9.6.22-1.mga7.noarch.rpm

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>50.3. <TT
CLASS="STRUCTNAME"
>pg_am</TT
></A
></H1
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_am</TT
> stores information about
   relation access methods.  There is one row for each access method supported
   by the system.
   Currently, only indexes have access methods.  The requirements for index
   access methods are discussed in detail in <A
HREF="indexam.html"
>Chapter 59</A
>.
  </P
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><P
><B
>Table 50-3. <TT
CLASS="STRUCTNAME"
>pg_am</TT
> Columns</B
></P
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><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"
>oid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
>&nbsp;</TD
><TD
>Row identifier (hidden attribute; must be explicitly selected)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>amname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Name of the access method</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>amhandler</TT
></TD
><TD
><TT
CLASS="TYPE"
>regproc</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
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><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>       OID of a handler function that is responsible for supplying information
       about the access method
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>amtype</TT
></TD
><TD
><TT
CLASS="TYPE"
>char</TT
></TD
><TD
>&nbsp;</TD
><TD
>       Currently always <TT
CLASS="LITERAL"
>i</TT
> to indicate an index access
       method; other values may be allowed in future
      </TD
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><P
><B
>Note: </B
>    Before <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.6, <TT
CLASS="STRUCTNAME"
>pg_am</TT
>
    contained many additional columns representing properties of index access
    methods.  That data is now only directly visible at the C code level.
    However, <CODE
CLASS="FUNCTION"
>pg_index_column_has_property()</CODE
> and related
    functions have been added to allow SQL queries to inspect index access
    method properties; see <A
HREF="functions-info.html#FUNCTIONS-INFO-CATALOG-TABLE"
>Table 9-62</A
>.
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