单项选择题
A.ANALYZE tablename (col_1,col_2):B.ANALYZE;C.ALTER TABLE tablename GATHER STATISTICS;D.ANALYZE tablename;
A.DBE_PERF active_sessionB.local_active DBE_PERFC.local_active_sessionD.pg_thread_wait_status
A.bigintB.blobC.varchar2(n)D.arrays