mirror_global_disk_quota_gb
Use this system parameter to globally set a disk quota (in GB) for all capture components including temporary files, transaction queues, and LOBs which are staged on the target before being applied. CDC Replication will manage disk space utilization across all components as required.
Versions supported—CDC Replication Engine for InfoSphere® DataStage® version 6.5 and later
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
- 1 GB
- Maximum Setting
- 9223372036854775807 GB
- Default Setting
- 9223372036854775807 GB