Locking can be applied on either of Page, table and table space.
In IBM Db2, locks can be applied at different levels to control access and ensure data consistency. The levels at which locks can be applied in Db2 are:
- Row Level: Locks are applied at the row level, meaning that a specific row of data is locked. This allows for fine-grained control over data access but may result in a higher level of contention.
- Page Level: Locks can be applied at the page level, where a whole page of data is locked. This provides a balance between granularity and overhead, as it reduces contention compared to row-level locks.
- Table Level: Locks at the table level involve locking the entire table. This provides the coarsest level of granularity and minimizes contention but can lead to decreased concurrency and performance.
- Tablespace Level: Locks can also be applied at the tablespace level, which encompasses all the tables within a given tablespace. This level of locking is coarser than table-level locking.
The choice of lock level depends on the specific requirements of the application and the desired balance between concurrency and data consistency. Different isolation levels and lock escalation mechanisms are also available in Db2 to further customize the locking behavior.