2

我必须删除超过 364 天的分区。分区被命名为“log_20110101”，所以比今天更旧的分区必须是

CONCAT('log_',TO_CHAR(SYSDATE -364,'YYYYMMDD'))

现在，如果我尝试这样的陈述，我会得到错误

ALTER TABLE LOG
DROP PARTITION CONCAT('log_',TO_CHAR(SYSDATE -364,'YYYYMMDD'));

-

Error report:
SQL Error: ORA-14048: a partition maintenance operation may not be combined with other operations
14048. 00000 -  "a partition maintenance operation may not be combined with other operations"
*Cause:    ALTER TABLE or ALTER INDEX statement attempted to combine
           a partition maintenance operation (e.g. MOVE PARTITION) with some
           other operation (e.g. ADD PARTITION or PCTFREE which is illegal
*Action:   Ensure that a partition maintenance operation is the sole
           operation specified in ALTER TABLE or ALTER INDEX statement;
           operations other than those dealing with partitions,
           default attributes of partitioned tables/indices or
           specifying that a table be renamed (ALTER TABLE RENAME) may be
           combined at will
4

1 回答 1

5

分区名称需要在你发出 SQL 语句的时候固定，不能是表达式。您应该能够在遍历USER_TAB_PARTITIONS表时执行类似的操作，找出要删除的分区，并构造动态 SQL 以实际删除它们。

DECLARE
  l_sql_stmt VARCHAR2(1000);
  l_date     DATE;
BEGIN
  FOR x IN (SELECT * 
              FROM user_tab_partitions
             WHERE table_name = 'LOG')
  LOOP
    l_date := to_date( substr( x.partition_name, 5 ), 'YYYYMMDD' );
    IF( l_date < add_months( trunc(sysdate), -12 ) )
    THEN
      l_sql_stmt := 'ALTER TABLE log ' ||
                    ' DROP PARTITION ' || x.partition_name;
      dbms_output.put_line( l_sql_stmt );
      EXECUTE IMMEDIATE l_sql_stmt;
    END IF;
  END LOOP;
END;
于 2011-06-22T22:22:28.680 回答