Note
This parameter had been rarely used since it was introduced. Therefore, it has been deprecated since OceanBase Database V4.0.0.
Description
global_major_freeze_residual_memory specifies the threshold of remaining memory for triggering a global freeze. When the available memory is less than this threshold, a global freeze is triggered.
Attributes
Attribute |
Description |
|---|---|
| Type | Integer |
| Default value | 40 |
| Value range | [1, 99] |
| Effective upon OBServer node restart | No |
Considerations
The value of global_major_freeze_residual_memory is in percentage with memory_limit - system_memory as the base. To be specific, the base is the total memory minus the memory reserved for the sys500 tenant. After the data of a frozen MemStore is merged, the occupied memory can be released. Therefore, the memory occupied by the frozen MemStore is considered as memory available for active_memstore, and the memory that the block cache can occupy is also considered as memory available to the MemStore.
Notice
The value of global_major_freeze_residual_memory must be greater than that of global_write_halt_residual_memory. Otherwise, the global freeze trigger will not take effect, and a global freeze can be triggered only by tenants.