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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DERBY-1799) SUR: current row not locked when renavigating to it, in queries with indexes
Date Mon, 08 Dec 2008 16:44:46 GMT

     [ https://issues.apache.org/jira/browse/DERBY-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kathey Marsden reassigned DERBY-1799:
-------------------------------------

    Assignee:     (was: Fernanda Pizzorno)

> SUR: current row not locked when renavigating to it, in queries with indexes
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-1799
>                 URL: https://issues.apache.org/jira/browse/DERBY-1799
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL, Store
>    Affects Versions: 10.2.1.6, 10.2.2.0, 10.3.1.4
>            Reporter: Andreas Korneliussen
>         Attachments: derby-1799.diff, derby-1799.stat
>
>
> This problem is detected in transactions with isolation level read-committed/read-uncommitted.
> We have a  table (T) which has a primary key (a), and a query which does "select A from
T" (an indexed select)
> If the result set is scrollable updatable, we expect the current row to be locked with
an update lock. This does not seem to happen when repositioning to a row which has been already
been fetched previously.
> The result is that either the wrong row is locked, or if the result set has been on after
last position, no row is locked.
> Output from ij:
> ij> get scroll insensitive cursor c1 as 'select a from t for update';
> ij> next c1;
> A          
> -----------
> 1          
> ij> select * from SYSCS_DIAG.LOCK_TABLE;
> XID            |TYPE |MODE|TABLENAME                                                
                                                                      |LOCKNAME          
 |STATE|TABLETYPE|LOCK&|INDEXNAME                                                    
                                                                  
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 243            |ROW  |U   |T                                                        
                                                                      |(1,7)             
 |GRANT|T        |1    |NULL                                                             
                                                              
> 243            |ROW  |S   |T                                                        
                                                                      |(1,1)             
 |GRANT|T        |1    |SQL060901103455010                                               
                                                              
> 243            |TABLE|IX  |T                                                        
                                                                      |Tablelock         
 |GRANT|T        |4    |NULL                                                             
                                                              
> 3 rows selected
> ij> after last c1;
> No current row
> ij> previous c1;
> A          
> -----------
> 3          
> ij>  select * from SYSCS_DIAG.LOCK_TABLE;
> XID            |TYPE |MODE|TABLENAME                                                
                                                                      |LOCKNAME          
 |STATE|TABLETYPE|LOCK&|INDEXNAME                                                    
                                                                  
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 243            |TABLE|IX  |T                                                        
                                                                      |Tablelock         
 |GRANT|T        |4    |NULL                                                             
                                                              
> 1 row selected
> The last select shows that no row is locked at this point, however we expect one row
to be locked.

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