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Add a time-of-preparation column to the pg_prepared_xacts view, per an

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old suggestion by Oliver Jowett.  Also, add a transaction column to the
pg_locks view to show the xid of each transaction holding or awaiting
locks; this allows prepared transactions to be properly associated with
the locks they own.  There was already a column named 'transaction',
and I chose to rename it to 'transactionid' --- since this column is
new in the current devel cycle there should be no backwards compatibility
issue to worry about.
This commit is contained in:
Tom Lane
2005-06-18 19:33:42 +00:00
parent 66b098492e
commit a8d1075f27
8 changed files with 106 additions and 54 deletions
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41
doc/src/sgml/catalogs.sgml
View File

@ -1,6 +1,6 @@
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
$PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.104 2005/06/17 22:32:41 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.105 2005/06/18 19:33:41 tgl Exp $
-->
<chapter id="catalogs">
@ -4090,7 +4090,7 @@
<literal>extend</>,
<literal>page</>,
<literal>tuple</>,
<literal>transaction</>,
<literal>transactionid</>,
<literal>object</>, or
<literal>userlock</>
</entry>
@ -4132,7 +4132,7 @@
</entry>
</row>
<row>
<entry><structfield>transaction</structfield></entry>
<entry><structfield>transactionid</structfield></entry>
<entry><type>xid</type></entry>
<entry></entry>
<entry>
@ -4168,13 +4168,21 @@
zero. NULL if the object is not a general database object
</entry>
</row>
<row>
<entry><structfield>transaction</structfield></entry>
<entry><type>xid</type></entry>
<entry></entry>
<entry>
ID of the transaction that is holding or awaiting this lock.
</entry>
</row>
<row>
<entry><structfield>pid</structfield></entry>
<entry><type>integer</type></entry>
<entry></entry>
<entry>
Process ID of the server process holding or awaiting this
lock. Zero if the lock is held by a prepared transaction.
lock. Null if the lock is held by a prepared transaction.
</entry>
</row>
<row>
@ -4196,12 +4204,12 @@
<para>
<structfield>granted</structfield> is true in a row representing a lock
held by the indicated session. False indicates that this session is
held by the indicated transaction. False indicates that this transaction is
currently waiting to acquire this lock, which implies that some other
session is holding a conflicting lock mode on the same lockable object.
The waiting session will sleep until the other lock is released (or a
deadlock situation is detected). A single session can be waiting to acquire
at most one lock at a time.
transaction is holding a conflicting lock mode on the same lockable object.
The waiting transaction will sleep until the other lock is released (or a
deadlock situation is detected). A single transaction can be waiting to
acquire at most one lock at a time.
</para>
<para>
@ -4253,6 +4261,13 @@
<structfield>procpid</structfield> column of the
<structname>pg_stat_activity</structname> view to get more
information on the session holding or waiting to hold the lock.
Also, if you are using prepared transactions, the
<structfield>transaction</> column can be joined to the
<structfield>transaction</structfield> column of the
<structname>pg_prepared_xacts</structname> view to get more
information on prepared transactions that hold locks.
(A prepared transaction can never be waiting for a lock,
but it continues to hold the locks it acquired while running.)
</para>
</sect1>
@ -4306,6 +4321,14 @@
Global transaction identifier that was assigned to the transaction
</entry>
</row>
<row>
<entry><structfield>prepared</structfield></entry>
<entry><type>timestamp with time zone</type></entry>
<entry></entry>
<entry>
Time at which the transaction was prepared for commit
</entry>
</row>
<row>
<entry><structfield>owner</structfield></entry>
<entry><type>name</type></entry>