Default Parameters for MongoTransTest

Using the MongoTransTest test, administrators can be instantly alerted if more than a permissible number of rollbacks are happening on a target MongoDB server. In addition, the test monitors transaction checkpoints. A checkpoint acts as a recovery point for an operation. When a transaction attempts to modify the data in a data file, MongoDB presents an in-memory snapshot/copy of that data and allows changes to be made to that data. While writing the data in the snapshots to the disk, MongoDB creates restoration points between the snapshots, called checkpoints. If these checkpoints are not created frequently, it only means that data is not written to the disk regularly; this increases the risk of data loss during recovery. To avoid this, administrators can use the MongoTransTest test to monitor the time taken for creating the most recent checkpoint and thus, quickly detect delays in check point creation or writing to disk.

This page depicts the default parameters that need to be configured for MongoTransTest.

• The TEST PERIOD list box helps the user to decide how often this test needs to be executed.

• The test connects to a specific Mongo database to run API commands and pull metrics of interest. Specify the name of this database in the DATABASE NAME text box. The default value of this parameter is admin.

• Once the necessary values have been provided, clicking on the UPDATE button will register the changes made.

When changing default configurations of tests, the values with "$" indicate variables that will be replaced by the eG system according to the specific server being managed - for instance, $hostName is the host/nickname of the target host, $port is the port number of the server being monitored. E.g., for a server xyz:80, $hostName will be changed automatically by the eG manager to "xyz" and $port will be changed to "80" when configuring a test.