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Clean up logging for extended-query-protocol operations, as per my recent

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proposal.  Parameter logging works even for binary-format parameters, and
logging overhead is avoided when disabled.

log_statement = all output for the src/test/examples/testlibpq3.c example
now looks like

LOG:  statement: execute <unnamed>: SELECT * FROM test1 WHERE t = $1
DETAIL:  parameters: $1 = 'joe''s place'
LOG:  statement: execute <unnamed>: SELECT * FROM test1 WHERE i = $1::int4
DETAIL:  parameters: $1 = '2'

and log_min_duration_statement = 0 results in

LOG:  duration: 2.431 ms  parse <unnamed>: SELECT * FROM test1 WHERE t = $1
LOG:  duration: 2.335 ms  bind <unnamed> to <unnamed>: SELECT * FROM test1 WHERE t = $1
DETAIL:  parameters: $1 = 'joe''s place'
LOG:  duration: 0.394 ms  execute <unnamed>: SELECT * FROM test1 WHERE t = $1
DETAIL:  parameters: $1 = 'joe''s place'
LOG:  duration: 1.251 ms  parse <unnamed>: SELECT * FROM test1 WHERE i = $1::int4
LOG:  duration: 0.566 ms  bind <unnamed> to <unnamed>: SELECT * FROM test1 WHERE i = $1::int4
DETAIL:  parameters: $1 = '2'
LOG:  duration: 0.173 ms  execute <unnamed>: SELECT * FROM test1 WHERE i = $1::int4
DETAIL:  parameters: $1 = '2'

(This example demonstrates the folly of ignoring parse/bind steps for duration
logging purposes, BTW.)

Along the way, create a less ad-hoc mechanism for determining which commands
are logged by log_statement = mod and log_statement = ddl.  The former coding
was actually missing quite a few things that look like ddl to me, and it
did not handle EXECUTE or extended query protocol correctly at all.

This commit does not do anything about the question of whether log_duration
should be removed or made less redundant with log_min_duration_statement.
This commit is contained in:
Tom Lane
2006-09-07 22:52:01 +00:00
parent b6eab50ce4
commit 893632be4e
10 changed files with 828 additions and 319 deletions
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16
src/backend/utils/mmgr/README
View File

@@ -1,4 +1,4 @@
$PostgreSQL: pgsql/src/backend/utils/mmgr/README,v 1.8 2004/08/04 21:34:04 tgl Exp $
$PostgreSQL: pgsql/src/backend/utils/mmgr/README,v 1.9 2006/09/07 22:52:01 tgl Exp $
Notes about memory allocation redesign
--------------------------------------
@@ -202,13 +202,13 @@ data kept here is pending NOTIFY messages, which are sent at top-level commit,
but only if the generating subtransaction did not abort.
QueryContext --- this is not actually a separate context, but a global
variable pointing to the context that holds the current command's parse
and plan trees. (In simple-Query mode this points to MessageContext;
when executing a prepared statement it will point at the prepared
statement's private context.) Generally it is not appropriate for any
code to use QueryContext as an allocation target --- from the point of
view of any code that would be referencing the QueryContext variable,
it's a read-only context.
variable pointing to the context that holds the current command's parse tree.
(In simple-Query mode this points to MessageContext; when executing a
prepared statement it will point to the prepared statement's private context.
Note that the plan tree may or may not be in this same context.)
Generally it is not appropriate for any code to use QueryContext as an
allocation target --- from the point of view of any code that would be
referencing the QueryContext variable, it's a read-only context.
PortalContext --- this is not actually a separate context either, but a
global variable pointing to the per-portal context of the currently active

10
src/backend/utils/mmgr/portalmem.c
View File

@@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.93 2006/08/29 02:11:30 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.94 2006/09/07 22:52:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -266,15 +266,14 @@ CreateNewPortal(void)
* Notes: commandTag shall be NULL if and only if the original query string
* (before rewriting) was an empty string. Also, the passed commandTag must
* be a pointer to a constant string, since it is not copied. The caller is
* responsible for ensuring that the passed sourceText (if any), parse and
* plan trees have adequate lifetime. Also, queryContext must accurately
* describe the location of the parse and plan trees.
* responsible for ensuring that the passed prepStmtName (if any), sourceText
* (if any), parse and plan trees have adequate lifetime. Also, queryContext
* must accurately describe the location of the parse trees.
*/
void
PortalDefineQuery(Portal portal,
const char *prepStmtName,
const char *sourceText,
const char *bindText,
const char *commandTag,
List *parseTrees,
List *planTrees,
@@ -289,7 +288,6 @@ PortalDefineQuery(Portal portal,
portal->prepStmtName = prepStmtName;
portal->sourceText = sourceText;
portal->bindText = bindText;
portal->commandTag = commandTag;
portal->parseTrees = parseTrees;
portal->planTrees = planTrees;