12c install parameter online patch compression rollback columnar database bp recommendation V$EVENT_NAME asktom 설치 paging index rownum inmemory_area oracle FBI 조나단루이스 backup ENABLE_DDL_LOGGING nid storage rac optimization conflict pagination USER_IND_EXPRESSIONS 11.2.0.4 replay hybrid ddl psu memory recover change database name patch imcu inmemory_size in-memory flashback