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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6216) XPLAIN feature does not work and gives ERROR XCL16: ResultSet not open
Date Mon, 15 Jul 2013 16:02:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708578#comment-13708578
] 

Knut Anders Hatlen commented on DERBY-6216:
-------------------------------------------

I added a call to dumpStatements() right before the failing assert. This is what it printed
(the getSchemas statement is unexpected):

c9d6825c-013f-e304-f57a-000058ee2be7,null,   ,EXECUTE STATEMENT SYS."getSchemas",8,Linux,F,2013-07-15
17:48:43.56,Thread[main,5,main],13846,3,wombat,null,null
c70a4272-013f-e304-f57a-000058ee2be7,2,S  ,select sql_text from syscs_diag.transaction_table
where status != 'IDLE',8,Linux,O,2013-07-15 17:48:43.583,Thread[main,5,main],13846,3,wombat,null,null
                
> XPLAIN feature does not work and gives ERROR XCL16: ResultSet not open
> ----------------------------------------------------------------------
>
>                 Key: DERBY-6216
>                 URL: https://issues.apache.org/jira/browse/DERBY-6216
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions: 10.6.2.3, 10.7.1.4, 10.8.3.1, 10.9.1.0
>         Environment: Solaris 10, MacOS X 10.6, Windows XP
>            Reporter: Brett Bergquist
>            Assignee: Bryan Pendleton
>              Labels: derby_triage10_11, features
>             Fix For: 10.11.0.0
>
>         Attachments: addTests.diff, emptyRS.diff, noMemberField.diff, preparedTests.diff,
xplain-only.diff
>
>
> I am running Derby 10.9.1.0 and am trying to figure out a  performance problem with query
taking too long.   I don’t actually want to run the query so from the documentation, I try:
> call syscs_util.syscs_set_runtimestatistics(1);
> call syscs_util.syscs_set_xplain_schema('STATS');
> call syscs_util.syscs_set_xplain_mode(1);
> --- my query here
> call syscs_util.syscs_set_runtimestatistics(0);
> call syscs_util.syscs_set_xplain_schema('');
> call syscs_util.syscs_set_xplain_mode(0);
> When it runs my query, I get:
> ERROR XCL16: ResultSet not open. Operation 'getMetaData' not permitted. Verify that autocommit
is OFF.
> I try the following with IJ just to see:
> call syscs_util.syscs_set_runtimestatistics(1);
> call syscs_util.syscs_set_xplain_schema('STATS');
> call syscs_util.syscs_set_xplain_mode(1);
> select sql_text from syscs_diag.transaction_table where status != 'IDLE';
> call syscs_util.syscs_set_runtimestatistics(0);
> call syscs_util.syscs_set_xplain_schema('');
> call syscs_util.syscs_set_xplain_mode(0);
> Note I have tried this with real tables as apposed to the syscs_diag.transaction_table
with the same result.  The only reason that I posted this with this table is that it is a
table that is accessible for any database.

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