Note
This variable is available starting with V2.2.77.
Description
ob_proxy_global_variables_version is used when obproxy communicates with OBServer nodes. It specifies the latest version of global variables that OBServer nodes return to obproxy.
Attributes
| Attribute | Description |
|---|---|
| Type | Int |
| Default value | 0 |
| Value range | [0, INT64_MAX) |
| Scope | Session |
| Modifiable | No. This variable can be specified only when you create a tenant. After a tenant is created, you cannot modify the value by executing an SQL statement. |
Usage notes
You cannot query the value of this variable by executing the SHOW VARIABLES statement or querying the SYS.TENANT_VIRTUAL_SESSION_VARIABLE view (Oracle mode) or the information_schema.SESSION_VARIABLES view (MySQL mode). You can query the value of this variable by querying the SYS.DBA_OB_SYS_VARIABLES view (Oracle mode) or the oceanbase.DBA_OB_SYS_VARIABLES view (MySQL mode).
Alternatively, you can execute the SELECT statement to return the latest version number of the global variable:
obclient> SELECT @@ob_proxy_global_variables_version;
The return result is as follows:
+-------------------------------------+
| @@ob_proxy_global_variables_version |
+-------------------------------------+
| 0 |
+-------------------------------------+
1 row in set