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NAME="DATATYPE-PG-LSN"
>8.19. <ACRONYM
CLASS="ACRONYM"
>pg_lsn Type</ACRONYM
></A
></H1
><P
>    The <TT
CLASS="TYPE"
>pg_lsn</TT
> data type can be used to store LSN (Log Sequence
    Number) data which is a pointer to a location in the XLOG. This type is a
    representation of <TT
CLASS="TYPE"
>XLogRecPtr</TT
> and an internal system type of
    <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
   </P
><P
>    Internally, an LSN is a 64-bit integer, representing a byte position in
    the write-ahead log stream.  It is printed as two hexadecimal numbers of
    up to 8 digits each, separated by a slash; for example,
    <TT
CLASS="LITERAL"
>16/B374D848</TT
>.  The <TT
CLASS="TYPE"
>pg_lsn</TT
> type supports the
    standard comparison operators, like <TT
CLASS="LITERAL"
>=</TT
> and
    <TT
CLASS="LITERAL"
>&gt;</TT
>.  Two LSNs can be subtracted using the
    <TT
CLASS="LITERAL"
>-</TT
> operator; the result is the number of bytes separating
    those write-ahead log positions.
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