LS Optimization for Subversion¶
This section is not relevant if you are using Git. It is only relevant for Subversion.
The uniqueness detection feature described in the previous section, requires examining the contents of the current database in the remote repository before performing a check-in or a check-out. To do this, the Server has to execute the LS operation several times. If you are going to use the VCS integration with Subversion repositories accessed through the HTTP or HTTPS protocols, we recommend activating the LS optimization for Subversion because with this protocol, examining the remote repository can be an expensive operation.
You do not need to activate this optimization when using Microsoft Team
Foundation Server (TFS) or Subversion through the
protocols. In these cases, examining the contents of the remote
repository is an efficient operation.
By default, the LS optimization for Subversion is enabled when Virtual DataPort runs on Windows, but disabled on Linux. We recommend activating this optimization on Linux as well because the LS operation is executed at different points by Virtual DataPort VCS commands, so the optimization affects the overall performance of the VCS integration.
Activating the LS Optimization¶
To activate this optimization, follow these steps:
Open the “VQL Shell” (Tools menu)
Execute this command:
SET 'com.denodo.vdb.vdbinterface.server.vcs.VCSConfigurationManager.lsopt' = '3'
Restart the Virtual DataPort Server.
The value of the property
can be one of the following:
0: The LS optimization is disabled.
1: The LS optimization is enabled if Virtual DataPort runs on Windows.
2: The LS optimization is enabled if Virtual DataPort runs on Linux.
3: The LS optimization is enabled regardless of the operating system.
To make sure that this optimization has been enabled, follow these steps:
Connect to a version-controlled database.
Open the VQL Shell and execute the following commands:
CALL LOGCONTROLLER('com.denodo.vdb.interpreter.execution.vcs.svn.SvnPlugin', 'DEBUG'); VCSCONTENTS '/databases/<database_name>' FILES; CALL LOGCONTROLLER('com.denodo.vdb.interpreter.execution.vcs.svn.SvnPlugin', 'ERROR');
<DENODO_HOME>/logs/vdp/vdp.logand check that at the end of the file, there is something like:
com.denodo.vdb.interpreter.execution.vcs.svn.SvnPlugin - Executing <DENODO_HOME>/dll/vdp/svn-fastls/linux/denodo-fastsvnls
The execution time for the operation is also logged:
Total execution time = <time_in_milliseconds>
This feature has been tested on Windows and in the following Linux distributions:
Red Hat Enterprise Linux 6.5 x86_64
Red Hat Enterprise Linux 6.6 x86
Red Hat Enterprise Linux 7 x86_64
Ubuntu 13.10 x86
Ubuntu 13.10 x86_64
Ubuntu 14.04 LTS x86
Ubuntu 14.04 LTS x86_64
If your environment is different to any of these, you still can benefit
from this enhancement: you will need to build the native executable that
implements the optimization. To do this, follow the steps detailed in