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