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* Query Timeout Question
@ 2011-12-09 01:44 feng.zhou <feng.zhou@wellintech.com>
2011-12-09 01:58 ` Re: Query Timeout Question feng.zhou <feng.zhou@wellintech.com>
2011-12-09 02:27 ` Re: Query Timeout Question Craig Ringer <ringerc@ringerc.id.au>
2011-12-09 02:51 ` Re: Re: [SQL] Query Timeout Question =?utf-8?B?ZmVuZy56aG91?= <feng.zhou@wellintech.com>
0 siblings, 3 replies; 4+ messages in thread
From: feng.zhou @ 2011-12-09 01:44 UTC (permalink / raw)
To: pgsql-sql
Hi
I set query timeout in code by using SQLSetStmtAttr ODBC API .
SQLSetStmtAttr( StatementHandle, SQL_ATTR_QUERY_TIMEOUT, (SQLPOINTER)timeout, 0 ) ;
SQLExecute(StatementHandle);
But I find this setting has no effect.Before adding timeout setting, SQLExecute costs 47 seconds.After adding timeout, costing time is same.
Postgres SQL version 8.4.2, ODBC driver 8.4.2
2011-12-09
feng.zhou
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Query Timeout Question
2011-12-09 01:44 Query Timeout Question feng.zhou <feng.zhou@wellintech.com>
@ 2011-12-09 01:58 ` feng.zhou <feng.zhou@wellintech.com>
2 siblings, 0 replies; 4+ messages in thread
From: feng.zhou @ 2011-12-09 01:58 UTC (permalink / raw)
To: pgsql-sql
sorry, timeout is 15 seconds
2011-12-09
feng.zhou
发件人： feng.zhou
发送时间： 2011-12-09 09:25:49
收件人： pgsql-sql
抄送：
主题： [SQL] Query Timeout Question
Hi
I set query timeout in code by using SQLSetStmtAttr ODBC API .
SQLSetStmtAttr( StatementHandle, SQL_ATTR_QUERY_TIMEOUT, (SQLPOINTER)timeout, 0 ) ;
SQLExecute(StatementHandle);
But I find this setting has no effect.Before adding timeout setting, SQLExecute costs 47 seconds.After adding timeout, costing time is same.
Postgres SQL version 8.4.2, ODBC driver 8.4.2
2011-12-09
feng.zhou
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Query Timeout Question
2011-12-09 01:44 Query Timeout Question feng.zhou <feng.zhou@wellintech.com>
@ 2011-12-09 02:27 ` Craig Ringer <ringerc@ringerc.id.au>
2 siblings, 0 replies; 4+ messages in thread
From: Craig Ringer @ 2011-12-09 02:27 UTC (permalink / raw)
To: feng.zhou <feng.zhou@wellintech.com>; +Cc: pgsql-sql
On 12/09/2011 09:44 AM, feng.zhou wrote:
> Hi
> I set query timeout in code by using SQLSetStmtAttr ODBC API .
> SQLSetStmtAttr( StatementHandle, SQL_ATTR_QUERY_TIMEOUT, (SQLPOINTER)timeout, 0 )
> ;
> SQLExecute(StatementHandle);
> But I find this setting has no effect.Before adding timeout setting,
> SQLExecute costs 47 seconds.After adding timeout, costing time is same.
First: You're using a very old patch release with known bugs. Update to
8.4.10 .
As for the timeout: PostgreSQL doesn't support query timeouts. It
supports a session-level statement timeout. I don't know whether the
ODBC driver uses that or not. Examine the ODBC `mylog' output after
enabling psqlODBC debugging, and examine the server log after turning on
query logging, so you can see what the ODBC driver actually asks the
server for when you set a query timeout.
--
Craig Ringer
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Re: [SQL] Query Timeout Question
2011-12-09 01:44 Query Timeout Question feng.zhou <feng.zhou@wellintech.com>
@ 2011-12-09 02:51 ` =?utf-8?B?ZmVuZy56aG91?= <feng.zhou@wellintech.com>
2 siblings, 0 replies; 4+ messages in thread
From: feng.zhou @ 2011-12-09 02:51 UTC (permalink / raw)
To: Craig Ringer <ringerc@ringerc.id.au>; +Cc: pgsql-sql
Thanks for your reply.
if timeout setting doesn't be supported, How to solve this question that the client is hung for long time when executing time-comsuming query or query a locked table.
2011-12-09
feng.zhou
发件人： Craig Ringer
发送时间： 2011-12-09 10:05:44
收件人： feng.zhou
抄送： pgsql-sql
主题： Re: [SQL] Query Timeout Question
On 12/09/2011 09:44 AM, feng.zhou wrote:
Hi
I set query timeout in code by using SQLSetStmtAttr ODBC API .
SQLSetStmtAttr( StatementHandle, SQL_ATTR_QUERY_TIMEOUT, (SQLPOINTER)timeout, 0 ) ;
SQLExecute(StatementHandle);
But I find this setting has no effect.Before adding timeout setting, SQLExecute costs 47 seconds.After adding timeout, costing time is same.
First: You're using a very old patch release with known bugs. Update to 8.4.10 .
As for the timeout: PostgreSQL doesn't support query timeouts. It supports a session-level statement timeout. I don't know whether the ODBC driver uses that or not. Examine the ODBC `mylog' output after enabling psqlODBC debugging, and examine the server log after turning on query logging, so you can see what the ODBC driver actually asks the server for when you set a query timeout.
--
Craig Ringer
^ permalink raw reply [nested|flat] 4+ messages in thread
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2011-12-09 01:44 Query Timeout Question feng.zhou <feng.zhou@wellintech.com>
2011-12-09 01:58 ` feng.zhou <feng.zhou@wellintech.com>
2011-12-09 02:27 ` Craig Ringer <ringerc@ringerc.id.au>
2011-12-09 02:51 ` =?utf-8?B?ZmVuZy56aG91?= <feng.zhou@wellintech.com>
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