Note
For V4.4.0, this parameter is available starting with V4.4.0.
Description
external_table_io_range_size specifies the maximum size of a merge range. If merging two consecutive ranges would result in a range larger than this size, they will not be merged.
Privilege requirements
Query the parameter
The
systenant and all user tenants can query this parameter 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 | 8 MB |
| 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 size of a merge range to 16 MB.
obclient> ALTER SYSTEM SET external_table_io_range_size = '16MB';
References
For more information about the maximum distance between two consecutive IO ranges, see external_table_io_hole_size.