Set read only mode:
SQL>
ALTER TABLE HR.EMPLOYEES READ ONLY;
Set read/write mode:
SQL>
ALTER TABLE HR.EMPLOYEES READ WRITE;
Check table status:
SQL>
SELECT OWNER, TABLE_NAME, READ_ONLY FROM DBA_TABLES WHERE TABLE_NAME = 'EMPLOYEES';
SQL>
ALTER TABLE HR.EMPLOYEES READ ONLY;
Set read/write mode:
SQL>
ALTER TABLE HR.EMPLOYEES READ WRITE;
Check table status:
SQL>
SELECT OWNER, TABLE_NAME, READ_ONLY FROM DBA_TABLES WHERE TABLE_NAME = 'EMPLOYEES';