// 物理读分析
SELECT b.sql_id,a.hash_value, a.buffer_gets/1024 buffer_gets_kb, a.disk_reads/1024 disk_reads_kb,
a.PHYSICAL_READ_BYTES/1024 physical_read_kb,a.PHYSICAL_WRITE_BYTES/1024 physical_write_kb,
a.executions, a.parse_calls
FROM V$SQLAREA a,v$sql b,(
SELECT '9rpgcrjzqrjaa' SQL_ID FROM DUAL UNION
SELECT '6t49g7kh115ja' SQL_ID FROM DUAL UNION) c
WHERE a.hash_Value = b.hash_Value AND b.sql_id = c.sql_id
order by disk_reads_kb desc
// 执行计划分析
select '202ss5rgtt2cx' sql_id,plan_table_output
from table(dbms_xplan.display_cursor('202ss5rgtt2cx'))
union
select 'awhv64yra0sct' sql_id,plan_table_output
from table(dbms_xplan.display_cursor('awhv64yra0sct'))
// 执行参数分析
select b.*
from dba_hist_snapshot a, dba_hist_sqlbind b
where a.snap_id = b.snap_id
and a.end_interval_time between
to_date('20140730 00:00:00', 'yyyymmdd HH24:MI:SS') and
to_date('20140731 23:59:00', 'yyyymmdd HH24:MI:SS')
and b.sql_id = 'dfunt68kpxwj5';
select b.snap_id,
b.dbid,
b.sql_id,
b.name,
b.position,
b.datatype_string,
b.value_string
from dba_hist_snapshot a, dba_hist_sqlbind b
where a.snap_id = b.snap_id
and a.end_interval_time between
to_date('20140730 00:00:00', 'yyyymmdd HH24:MI:SS') and
to_date('20140731 23:59:00', 'yyyymmdd HH24:MI:SS')
and b.sql_id = 'dfunt68kpxwj5'
order by b.snap_id,b.position;
// 查询每个表的列值的分布情况，合理规划索引
select table_name, column_name, num_distinct
from dba_tab_columns
where table_name in ('TT_DTS_RECORD',
'LSCM_TA_TMALL_SHIPPED_ORDER')
order by table_name,num_distinct desc;