Oracle 搜集统计信息的存储过程

DECLARE
  CURSOR STALE_TABLE IS
    SELECT OWNER,
           SEGMENT_NAME,
           CASE
             WHEN SIZE_GB < 0.5 THEN
              30
             WHEN SIZE_GB >= 0.5 AND SIZE_GB < 1 THEN
              20
             WHEN SIZE_GB >= 1 AND SIZE_GB < 5 THEN
              10
             WHEN SIZE_GB >= 5 AND SIZE_GB < 10 THEN
              5
             WHEN SIZE_GB >= 10 THEN
              1
           END AS PERCENT,
           8 AS DEGREE
      FROM (SELECT OWNER,
                   SEGMENT_NAME,
                   SUM(BYTES / 1024 / 1024 / 1024) SIZE_GB
              FROM DBA_SEGMENTS
             WHERE OWNER = 'ADWU_OPTIMA_AP11'
               AND SEGMENT_NAME IN
                   (SELECT /*+ UNNEST */
                    DISTINCT TABLE_NAME
                      FROM DBA_TAB_STATISTICS
                     WHERE (LAST_ANALYZED IS NULL OR STALE_STATS = 'YES')
                       AND OWNER = 'ADWU_OPTIMA_AP11')
             GROUP BY OWNER, SEGMENT_NAME);

BEGIN
  DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO;
  FOR STALE IN STALE_TABLE LOOP
    DBMS_STATS.GATHER_TABLE_STATS(OWNNAME          => STALE.OWNER,
                                  TABNAME          => STALE.SEGMENT_NAME,
                                  ESTIMATE_PERCENT => STALE.PERCENT,
                                  METHOD_OPT       => 'for all columns size repeat',
                                  DEGREE           => 8,
                                  GRANULARITY      => 'ALL',
                                  CASCADE          => TRUE);
  END LOOP;
END;
/