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Add new user fn pg_current_xlog_flush_location()

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Tomas Vondra, reviewed by Michael Paquier and Amit Kapila
Minor edits by me
This commit is contained in:
Simon Riggs
2016-01-12 07:54:52 +00:00
parent 1e29e6324c
commit e63bb4549a
4 changed files with 41 additions and 6 deletions
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23
doc/src/sgml/func.sgml
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@ -16788,6 +16788,9 @@ SELECT set_config('log_statement_stats', 'off', false);
<indexterm>
<primary>pg_create_restore_point</primary>
</indexterm>
<indexterm>
<primary>pg_current_xlog_flush_location</primary>
</indexterm>
<indexterm>
<primary>pg_current_xlog_insert_location</primary>
</indexterm>
@ -16843,6 +16846,13 @@ SELECT set_config('log_statement_stats', 'off', false);
<entry><type>pg_lsn</type></entry>
<entry>Create a named point for performing restore (restricted to superusers)</entry>
</row>
<row>
<entry>
<literal><function>pg_current_xlog_flush_location()</function></literal>
</entry>
<entry><type>pg_lsn</type></entry>
<entry>Get current transaction log flush location</entry>
</row>
<row>
<entry>
<literal><function>pg_current_xlog_insert_location()</function></literal>
@ -16977,13 +16987,14 @@ postgres=# select pg_start_backup('label_goes_here');
<function>pg_current_xlog_location</> displays the current transaction log write
location in the same format used by the above functions. Similarly,
<function>pg_current_xlog_insert_location</> displays the current transaction log
insertion point. The insertion point is the <quote>logical</> end
of the transaction log
at any instant, while the write location is the end of what has actually
been written out from the server's internal buffers. The write location
is the end of what can be examined from outside the server, and is usually
insertion point and <function>pg_current_xlog_flush_location</> displays the
current transaction log flush point. The insertion point is the <quote>logical</>
end of the transaction log at any instant, while the write location is the end of
what has actually been written out from the server's internal buffers and flush
location is the location guaranteed to be written to durable storage. The write
location is the end of what can be examined from outside the server, and is usually
what you want if you are interested in archiving partially-complete transaction log
files. The insertion point is made available primarily for server
files. The insertion and flush points are made available primarily for server
debugging purposes. These are both read-only operations and do not
require superuser permissions.
</para>