Repository checkpoints represent saved images of the repository
before configuration changes are made and can be used to restore the configuration
repository back to a prior state. Checkpoints are either full or delta images.
A full checkpoint is created manually by the administrator and is a copy of
the entire configuration repository. This includes applications and connectors.
Delta checkpoints are optional and are not enabled by default. A delta checkpoint
is created automatically when configuration changes are made. The delta checkpoint
is formed by making a copy of the configuration documents affected by the
configuration change before changes are actually applied.
Before you begin
If you are a user with either a monitor or an operator role, you
can only view the repository checkpoint information. If you are a user with
either a configurator or an administrator role, you have all configuration
privileges for repository checkpoints.
Ensure
that you have an adequate number of open file descriptors available. The default
number of open files setting is 2000, which is typically sufficient for most
applications. If the value set for this parameter is too low, errors might
occur when opening files or establishing connections. Because this value limits
the number of file descriptors that a server process might open, a value that
is too low prevents optimum performance. See Tuning operating systems for more information.
About this task
To create a full checkpoint, from the administrative console, click System
Administration > Extended Repository Service > under Additional Properties >
Repository Checkpoints. On this page you can create, delete, and restore
checkpoints.
Procedure
- Select New. You will be prompted for confirmation before
proceeding. While the checkpoint is being created, the repository is locked.
You will have read access only to configuration data while the checkpoint
is being created. Any attempt to make a configuration change during this period
will fail.
- Name the checkpoint.
- Type a checkpoint description.
- Click OK to create a full checkpoint.
- Click Extended repository service to return to the Configuration
page.
- To create a delta checkpoint, select the Enable automatic repository
checkpoints box and define the number of delta checkpoints that you want
to keep in the Automatic Checkpoint Depth field .
- Click Apply or OK.
Results
You configured a checkpoint to back up copies of files from the master
configuration repository. If you created a full checkpoint, you made a complete
copy of the entire configuration repository. If you enabled delta checkpoints,
subset snapshots of the configuration repository are created when you make
a change to the configuration.
What to do next
To undo recent changes, restore delta checkpoints in the reverse
order in which they were created. If you created a full checkpoint, you can
restore the entire configuration repository back to the state it was in at
the time the full checkpoint was made.