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BUG #2475: Row limit problem

From: "Sebastiaan van Erk" <sebster-postgresql(at)sebster(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #2475: Row limit problem
Date: 2006-06-09 14:53:25
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
The following bug has been logged online:

Bug reference:      2475
Logged by:          Sebastiaan van Erk
Email address:      sebster-postgresql(at)sebster(dot)com
PostgreSQL version: 8.1.4
Operating system:   Windows XP
Description:        Row limit problem

When using the "raw" protocol (such as JDBC uses) it seems that the row
limit is ignored.

The following code in the JDBC driver:

        // Total size = 4 (size field) + 1 + N (source portal) + 4 (max
        pgStream.SendChar('E');              // Execute
        pgStream.SendInteger4(4 + 1 + encodedSize + 4);  // message size
        if (encodedPortalName != null)
            pgStream.Send(encodedPortalName); // portal name
        pgStream.SendChar(0);                 // portal name terminator
        pgStream.SendInteger4(limit);       // row limit

in v3/ (latest non-dev version) DOES send the limit to
the database (and debugging showed it was the correct limit), however the
database seems to ignore it. We tried the following query namely (with the
above limit):

Query "select action_id from actions order by action_id" elapsed time
(seconds) - Total: 1.937, SQL query time: 1.562, Building output time: 0.375

However when we actually put a limit in the query itself we get the

Query "select action_id from actions order by action_id limit 100" elapsed
time (seconds) - Total: 0.156, SQL query time: 0.047, Building output time:

This shows the ENORMOUS different time it takes for the  two queries even
though they both have the limit set.


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