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https://issues.apache.org/jira/browse/DERBY-1412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635815#action_12635815
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Kim Haase commented on DERBY-1412:
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I have a couple of questions about this property that I can't figure out from
the source code:
1) Is the scope system-wide, database-wide, and/or at the conglomerate level?
These are not mutually exclusive; it could be all three.
http://db.apache.org/derby/docs/dev/devguide/cdevconcepts23810.html says, "You
typically set lock granularity for the entire Derby system". But it doesn't
state that this is the only scope allowed.
2) Is the property static or dynamic -- that is, must you reboot Derby or the
database for the change to take effect, or does it take effect immediately?
See http://db.apache.org/derby/docs/dev/tuning/ctunproper22250.html for
information on how these features apply to other properties.
> Possible values for derby.storage.rowLocking Derby engine is not currently
> documented eventhough the property is
> ----------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-1412
> URL: https://issues.apache.org/jira/browse/DERBY-1412
> Project: Derby
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 10.4.1.3
> Reporter: Francois Orsini
> Assignee: Kim Haase
> Priority: Minor
>
> Possible values for derby.storage.rowLocking Derby engine is not currently
> documented eventhough the property is at:
> http://db.apache.org/derby/docs/10.1/devguide/cdevconcepts23810.html
> 'derby.storage.rowLocking' basically disable RLL (row-level locking) in the
> engine.
> The possible values for 'derby.storage.rowLocking' which are 'true', 'false'
> and the default value are not documented at:
> http://db.apache.org/derby/docs/10.1/tuning/ctunproper22250.html
> Extract from the source code related to 'derby.storage.rowLocking' derby
> engine property definition:
> /**
> * In cloudscape products which support Row Level Locking (rll), use this
> * property to disable rll. Application's which use rll will use more
> * system resources, so if an application knows that it does not need rll
> * then it can use this system property to force all locking in the system
> * to lock at the table level.
> *
> * This property can be set to the boolean values "*true*" or "*false*".
> * Setting the property to true is the same as not setting the property at
> * all, and will result in rll being enabled. Setting the property to
> * false disables rll.
> *
> **
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