Note
For V4.4.0, this parameter is available starting with V4.4.0.
Description
external_table_io_hole_size specifies the maximum distance between two consecutive IO ranges. Ranges exceeding this value will not be merged.
Privilege requirements
Query the parameter
The
systenant and all user tenants can query this parameter by using theSHOW PARAMETERSstatement or theGV$OB_PARAMETERSview.Modify the parameter
The
systenant and user tenants can modify this parameter.
Attributes
Attribute |
Description |
|---|---|
| Type | Capacity |
| Default value | 1 MB, in bytes |
| Value range | [0, +∞) |
| Modifiable | Yes. You can use the ALTER SYSTEM SET statement to modify the parameter. |
| Effective upon OBServer node restart | No. The setting takes effect immediately. |
Examples
Set the maximum distance between two consecutive IO ranges to 2 MB.
obclient> ALTER SYSTEM SET external_table_io_hole_size = '2MB';
References
For more information about the maximum size of a merged range, see external_table_io_range_size.