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Invent WAL timelines, as per recent discussion, to make point-in-time

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recovery more manageable.  Also, undo recent change to add FILE_HEADER
and WASTED_SPACE records to XLOG; instead make the XLOG page header
variable-size with extra fields in the first page of an XLOG file.
This should fix the boundary-case bugs observed by Mark Kirkwood.
initdb forced due to change of XLOG representation.
This commit is contained in:
Tom Lane
2004-07-21 22:31:26 +00:00
parent 8d3517dc1f
commit 2042b3428d
26 changed files with 1322 additions and 982 deletions
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19
doc/src/sgml/page.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/page.sgml,v 1.17 2003/12/14 00:10:32 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/page.sgml,v 1.18 2004/07/21 22:31:18 tgl Exp $
-->
<chapter id="page">
@ -114,37 +114,38 @@ data. Empty in ordinary tables.</entry>
<entry>pd_lsn</entry>
<entry>XLogRecPtr</entry>
<entry>8 bytes</entry>
<entry>LSN: next byte after last byte of xlog</entry>
<entry>LSN: next byte after last byte of xlog record for last change
to this page</entry>
</row>
<row>
<entry>pd_sui</entry>
<entry>StartUpID</entry>
<entry>pd_tli</entry>
<entry>TimeLineID</entry>
<entry>4 bytes</entry>
<entry>SUI of last changes (currently it's used by heap AM only)</entry>
<entry>TLI of last change</entry>
</row>
<row>
<entry>pd_lower</entry>
<entry>LocationIndex</entry>
<entry>2 bytes</entry>
<entry>Offset to start of free space.</entry>
<entry>Offset to start of free space</entry>
</row>
<row>
<entry>pd_upper</entry>
<entry>LocationIndex</entry>
<entry>2 bytes</entry>
<entry>Offset to end of free space.</entry>
<entry>Offset to end of free space</entry>
</row>
<row>
<entry>pd_special</entry>
<entry>LocationIndex</entry>
<entry>2 bytes</entry>
<entry>Offset to start of special space.</entry>
<entry>Offset to start of special space</entry>
</row>
<row>
<entry>pd_pagesize_version</entry>
<entry>uint16</entry>
<entry>2 bytes</entry>
<entry>Page size and layout version number information.</entry>
<entry>Page size and layout version number information</entry>
</row>
</tbody>
</tgroup>