mirror_global_disk_quota_mb

Versions supported—CDC Replication Engine for MongoDB version 6.3

Capture components include the temporary files and transactions queues staged on the source and LOBs, which are staged on the target (for the record being applied). CDC Replication will manage disk space utilization across all components as required.

Most databases have a mechanism that allows you to roll back or undo changes to your database by storing uncommitted changes. Similarly, CDC Replication uses the disk quota controlled by this system parameter to store in scope change data that has not been committed in your database. Once the database transaction is committed, the disk space used by the transaction is released. Note that CDC Replication stores the data in memory to improve performance and will only persist the data to disk if memory is unavailable.

The default setting of this system parameter is such that the product will only stop replicating after this disk quota exhausts all available disk space on your system. If you would prefer the product to stop replicating after it uses a specific amount of disk space, you can set the value with this system parameter.

Applies to

Source and target datastores

Minimum Setting

100 MB

Maximum Setting

9223372036854775807 MB

Default Setting

9223372036854775807 MB