oracle收集统计信息

----小于500M的表每天收集全表统计信息

select 'exec dbms_stats.gather_table_stats(ownname=>''' || owner || '''' ||
       ',tabname=>''' || table_name || '''' ||
       ',estimate_percent=>100,method_opt=>''' ||
       'FOR all columns size repeat''' || ',cascade=> true);'
  from dba_tab_statistics
 where (owner, table_name) in
       (SELECT owner, table_name
          FROM DBA_TABLES
         WHERE OWNER in  ('TS', 'SS')
           AND (owner, TABLE_NAME) in
               (select owner, segment_name
                  from dba_segments
                 where owner in  ('TS', 'SS')
                 group by owner, segment_name
                having sum(bytes) / 1024 / 1024 < 500)
           and partitioned != 'YES')
   and (stale_stats = 'YES' or last_analyzed is null)
   AND OBJECT_TYPE = 'TABLE';

----非分区表大于500M，收集统计信息脚本（每天收集30%的统计信息）

select 'exec dbms_stats.gather_table_stats(ownname=>''' || owner || '''' ||
       ',tabname=>''' || table_name || '''' ||
       ',estimate_percent=>30,method_opt=>''' ||
       'FOR all columns size repeat''' || ',degree => 4,cascade=> true);'
  from dba_tab_statistics
 where (owner, table_name) in
       (SELECT owner, table_name
          FROM DBA_TABLES
         WHERE OWNER in ('TS', 'SS')
           AND (owner, TABLE_NAME) in
               (select owner, segment_name
                  from dba_segments
                 where owner in ('TS', 'SS')
                 group by owner, segment_name
                having sum(bytes) / 1024 / 1024 >= 500)
           and partitioned != 'YES')
   and (stale_stats = 'YES' or last_analyzed is null)
   AND OBJECT_TYPE = 'TABLE';

------分区表--每天copy上一个分区的统计信息(自增长分区表)

select 'EXEC DBMS_STATS.COPY_TABLE_STATS (' || '''' || table_owner || '''' || ',' || '''' ||
       table_name || '''' || ',' || '''' || 'SYS_P402' || '''' || ',' || '''' ||
       partition_name || '''' || ', FORCE=>TRUE);'
  from dba_tab_partitions
 where table_name = 'T_SS_AC_IM'
   and partition_position =
       (select max(partition_position)
          from dba_tab_partitions
         where table_name = 'T_SS_AC_IM');

------copy分区表统计信息脚本

[oracle@test1 ~]$ cat /home/oracle/copy_statics.sh

#!/bin/bash

source /home/oracle/.bash_profile

SDATE=$(date  +%Y%m)

TDATE=$(date -d 'next-month' +%Y%m)

SPNAME="P"${SDATE}

TPNAME="P"${TDATE}

exec >> /home/oracle/copy_statics`date +%y%m%d%H`.log

sqlplus / as sysdba << EOF

set timing on

EXEC DBMS_STATS.UNLOCK_TABLE_STATS ('TS','T_TS_TR');

EXEC DBMS_STATS.UNLOCK_TABLE_STATS ('TS','T_TS_TR_ND');

EXEC DBMS_STATS.COPY_TABLE_STATS ('TS', 'T_TS_CUP_Z_TR', '$SPNAME', '$TPNAME',FORCE=>TRUE);

EXEC DBMS_STATS.COPY_TABLE_STATS ('TS', 'T_TS_TR', '$SPNAME', '$TPNAME', FORCE=>TRUE);

EXEC DBMS_STATS.COPY_TABLE_STATS ('TS', 'T_TS_TR_ND', '$SPNAME', '$TPNAME', FORCE=>TRUE);

EXEC DBMS_STATS.LOCK_TABLE_STATS ('TS','T_TS_TR');

EXEC DBMS_STATS.LOCK_TABLE_STATS ('TS','T_TS_TR_ND');

exit;

EOF