Cannot find table v$parameter in Oracle

问题

I want to get the number of sessions in Oracle using the SQL query:

SELECT value FROM v$parameter WHERE name = 'sessions'

But I get this error:

Error starting at line 1 in command:
SELECT value FROM v$parameter WHERE name = 'sessions'
Error at Command Line:1 Column:18
Error report:
SQL Error: ORA-00942: table or view does not exist
00942. 00000 -  "table or view does not exist"
*Cause:    
*Action:

Maybe the Oracle user that I use is not privileged?

回答1:

Generally the better approach is to use a procedure and grant the necessary privileges to this procedure. However if you want use SQL directly, you can grant SELECT_CATALOG_ROLE or SELECT ANY DICTIONARY to the user.

回答2:

Probably. To grant the rights, you need to use the table name as V_$PARAMETER. It comes from some restriction when granting rights on dynamic views.

回答3:

using the privileges: - select any table, alter any table when running the grant as SYS with SYSDBA in Oracle 12c solved the issue for me.

来源：https://stackoverflow.com/questions/14924681/cannot-find-table-vparameter-in-oracle