开发的同事发来一条语句，让我帮忙查看下ods和源端的结果是否一致。因为一下执行没出来，问开发人员，这个语句要跑2-3分钟。
因为他们是从本地用dblink连到ods的，我这里把dblink去掉直接从ods查看执行计划。
SELECT XSY_CODE,--发展销售员编码
SLY_CODE,--受理销售员编码
XSD_CODE,--销售点编码
DZS_CODE,--店中商编码
JYZT_CODE--销售员所属经营主体编码
FROM (select /*+parallel(a,10) parallel(b,10) parallel(c,10) parallel(d,10)*/a.subs_id,c.serv_id,b.action_id,d.action_type,a.stat,a.stat_date
from crm_gz.tb_ba_subscription_hist a,
crm_gz.tb_ba_action_hist b,
crm_gz.tb_ba_serv_hist c,
crm_gz.tb_pm_action d
where a.subs_id=b.subs_id and a.subs_id=c.subs_id and b.action_id=d.action_id
and d.city_id='200' and a.stat='S0C') a,
(select * from crm_gz.tb_ba_channelstaff
where modi_date>=to_date('20141123','yyyymmdd')) b
WHERE a.subs_id=b.subs_id(+)
and a.stat_date>=to_date('20141123','yyyymmdd')
and ((a.action_type='NEW' and a.action_id not in(14030,14266,7021))
or a.action_id in(14099,14260,6448))
AND SERV_ID in ('3751990561',
'3751991941',
'3751992281',
'3751992431',
'3751992831',
'3751994541',
'3751994561',
'3753633921',
'3753633981',
'3753634021',
'3753634041',
'3753634111',
'3753634271',
'3753622431',
'3753644141',
'3753645051',
'3753645261',
'3753647021',
'3745498320',
'3751978420',
'3751978950');
--于是看下执行计划
-----------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 232 | 296 (0)| 00:00:05 | | |
|* 1 | TABLE ACCESS BY LOCAL INDEX ROWID | TB_BA_SERV_HIST | 1 | 15 | 79 (0)| 00:00:02 | | |
| 2 | NESTED LOOPS | | 2 | 232 | 296 (0)| 00:00:05 | | |
| 3 | NESTED LOOPS OUTER | | 2 | 202 | 139 (0)| 00:00:02 | | |
| 4 | NESTED LOOPS | | 2 | 98 | 136 (0)| 00:00:02 | | |
| 5 | NESTED LOOPS | | 12 | 396 | 124 (0)| 00:00:02 | | |
| 6 | PARTITION RANGE ALL | | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 |
| 7 | TABLE ACCESS BY LOCAL INDEX ROWID| ORDER_ITEM_HIST | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 |
|* 8 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 | | 79 (0)| 00:00:02 | 1 | 39 |
| 9 | TABLE ACCESS BY INDEX ROWID | TB_BA_ACTION_HIST | 1 | 13 | 3 (0)| 00:00:01 | | |
|* 10 | INDEX RANGE SCAN | IX_BA_ACT_SUBSID_HIST | 1 | | 2 (0)| 00:00:01 | | |
|* 11 | TABLE ACCESS BY INDEX ROWID | TB_PM_ACTION | 1 | 16 | 1 (0)| 00:00:01 | | |
|* 12 | INDEX UNIQUE SCAN | PK_PM_ACTION | 1 | | 0 (0)| 00:00:01 | | |
|* 13 | TABLE ACCESS BY INDEX ROWID | TB_BA_CHANNELSTAFF | 1 | 52 | 2 (0)| 00:00:01 | | |
|* 14 | INDEX UNIQUE SCAN | PK_CHANNELSTAFF_SUBS_ID | 1 | | 1 (0)| 00:00:01 | | |
| 15 | PARTITION RANGE ALL | | 1 | | 78 (0)| 00:00:02 | 1 | 39 |
|* 16 | INDEX RANGE SCAN | IX_BA_SERVSUBSID_HIST | 1 | | 78 (0)| 00:00:02 | 1 | 39 |
-----------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("C"."SERV_ID"=3745498320 OR "C"."SERV_ID"=3751978420 OR "C"."SERV_ID"=3751978950 OR "C"."SERV_ID"=3751990561
OR "C"."SERV_ID"=3751991941 OR "C"."SERV_ID"=3751992281 OR "C"."SERV_ID"=3751992431 OR "C"."SERV_ID"=3751992831 OR
"C"."SERV_ID"=3751994541 OR "C"."SERV_ID"=3751994561 OR "C"."SERV_ID"=3753622431 OR "C"."SERV_ID"=3753633921 OR
"C"."SERV_ID"=3753633981 OR "C"."SERV_ID"=3753634021 OR "C"."SERV_ID"=3753634041 OR "C"."SERV_ID"=3753634111 OR
"C"."SERV_ID"=3753634271 OR "C"."SERV_ID"=3753644141 OR "C"."SERV_ID"=3753645051 OR "C"."SERV_ID"=3753645261 OR
"C"."SERV_ID"=3753647021)
8 - access("STAT"='S0C' AND "STATUS_DATE">=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
10 - access("ORDER_ITEM_ID"="B"."SUBS_ID")
11 - filter("D"."ACTION_TYPE"='NEW' AND "B"."ACTION_ID"<>14030 AND "B"."ACTION_ID"<>14266 AND "B"."ACTION_ID"<>7021 OR
"B"."ACTION_ID"=6448 OR "B"."ACTION_ID"=14099 OR "B"."ACTION_ID"=14260)
12 - access("B"."ACTION_ID"="D"."ACTION_ID" AND "D"."CITY_ID"='200')
13 - filter("MODI_DATE"(+)>=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
14 - access("ORDER_ITEM_ID"="TB_BA_CHANNELSTAFF"."SUBS_ID"(+))
16 - access("ORDER_ITEM_ID"="C"."SUBS_ID")
--再查下相关的对象情况
......getting segment size......
OWNER SEGMENT_NAME SEGMENT_TYPE Size(Mb)
-------------------- ------------------------------ -------------------- ----------
CRM2_PUB PK_PM_ACTION INDEX 3
CRM_GZ PK_CHANNELSTAFF_SUBS_ID INDEX 1993
CRM_GZ IX_BA_ACT_SUBSID_HIST INDEX 8644.5
CRM_GZ IX_BA_SERVSUBSID_HIST INDEX PARTITION 3779.75
CRM_GZ IXH_ORDERITEM_STATDATE INDEX PARTITION 7927.5625
CRM2_PUB TB_PM_ACTION TABLE 34
CRM_GZ TB_BA_CHANNELSTAFF TABLE 9961
CRM_GZ TB_BA_ACTION_HIST TABLE 29305
CRM_GZ TB_BA_SERV_HIST TABLE PARTITION 30768.25
CRM_GZ ORDER_ITEM_HIST TABLE PARTITION 58503.625
10 rows selected.
Elapsed: 00:00:00.34
......getting table infomation......
OWNER TABLE_NAME Size(Mb) PAR DEGREE NUM_ROWS GLO STATS GATHER TIME
-------------------- ------------------------------ ---------- --- ---------- ---------- --- ------------------
CRM2_PUB *TB_PM_ACTION 26.6463165 NO 1 120434 YES 78.6312153
CRM2_PUB TB_PM_ACTION 26.6463165 NO 1 120434 YES 78.6312153
CRM_GZ *TB_BA_CHANNELSTAFF 7909.30271 NO 1 94244375 YES 23.6510532
CRM_GZ TB_BA_CHANNELSTAFF 7909.30271 NO 1 94244375 YES 23.6510532
CRM_GZ *TB_BA_SERV_HIST 23083.6036 YES 1 129438036 YES 78.5309028
CRM_GZ TB_BA_SERV_HIST 23083.6036 YES 1 129438036 YES 78.5309028
CRM_GZ *ORDER_ITEM_HIST 43997.6631 YES 1 212603196 YES 78.6465972
CRM_GZ ORDER_ITEM_HIST 43997.6631 YES 1 212603196 YES 78.6465972
CRM_GZ *TB_BA_ACTION_HIST 22367.6905 NO 1 279216946 YES 78.6315972
CRM_GZ TB_BA_ACTION_HIST 22367.6905 NO 1 279216946 YES 78.6315972
10 rows selected.
Elapsed: 00:00:00.12
......getting index infomation......
OWNER INDEX_NAME TABLE_NAME PAR UNIQUENES DEGREE INDEX_TYPE LEAF_BLOCKS BLEVEL CLUSTERING_FACTOR
-------------------- ------------------------------ ------------------------------ --- --------- ---------- ---------- ----------- ---------- ----------------- -----
CRM_GZ IX_BA_ACT_SUBSID_HIST TB_BA_ACTION_HIST NO NONUNIQUE 1 NORMAL 492002 2 220159998 100
CRM_GZ IX_BA_SERVSUBSID_HIST TB_BA_SERV_HIST YES NONUNIQUE 1 NORMAL 196468 2 97894132 100
CRM_GZ IXH_ORDERITEM_STATDATE ORDER_ITEM_HIST YES NONUNIQUE 1 NORMAL 433702 2 153506102 17.3428035
CRM_GZ PK_CHANNELSTAFF_SUBS_ID TB_BA_CHANNELSTAFF NO UNIQUE 1 NORMAL 116755 2 83251565 100
CRM2_PUB PK_PM_ACTION TB_PM_ACTION NO UNIQUE 1 NORMAL 155 1 98209 100
5 rows selected.
其实，在olap中走3分钟是还能接受的，但是看了一下执行计划，觉得还能再进一步优化。很明显，这里的hint没有起作用
/*+parallel(a,10) parallel(b,10) parallel(c,10) parallel(d,10)*/，执行计划并不走并行。其实，走并行使错的。
因为下面3个表非常大，加起来有100G，走再多的并行也难在3分钟内扫描完。
OWNER SEGMENT_NAME SEGMENT_TYPE Size(Mb)
-------------------- ------------------------------ -------------------- ----------
CRM_GZ TB_BA_ACTION_HIST TABLE 29305
CRM_GZ TB_BA_SERV_HIST TABLE PARTITION 30768.25
CRM_GZ ORDER_ITEM_HIST TABLE PARTITION 58503.625
|* 8 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 |
执行计划中第8歩有疑问，cbo认为只返回12行。直接手工算下，果然有问题。
select count(*) from CRM_GZ.ORDER_ITEM_HIST where "STAT"='S0C' AND "STATUS_DATE">=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss');
--220647
实际上返回220647行。那么问题来了，这里明显要走hash才是最优化的。这里有好几种方法都有效。
--方法1：/*+leading(c)*/
SELECT <span style="color:#ff0000;">/*+leading(c)*/</span>XSY_CODE,--发展销售员编码
SLY_CODE,--受理销售员编码
XSD_CODE,--销售点编码
DZS_CODE,--店中商编码
JYZT_CODE--销售员所属经营主体编码
FROM (select a.subs_id,c.serv_id,b.action_id,d.action_type,a.stat,a.stat_date
from crm_gz.tb_ba_subscription_hist a,
crm_gz.tb_ba_action_hist b,
crm_gz.tb_ba_serv_hist c,
crm_gz.tb_pm_action d
where a.subs_id=b.subs_id and a.subs_id=c.subs_id and b.action_id=d.action_id
and d.city_id='200' and a.stat='S0C') a,
(select * from crm_gz.tb_ba_channelstaff
where modi_date>=to_date('20141123','yyyymmdd')) b
WHERE a.subs_id=b.subs_id(+)
and a.stat_date>=to_date('20141123','yyyymmdd')
and ((a.action_type='NEW' and a.action_id not in(14030,14266,7021))
or a.action_id in(14099,14260,6448))
AND SERV_ID in ('3751990561',
'3751991941',
'3751992281',
'3751992431',
'3751992831',
'3751994541',
'3751994561',
'3753633921',
'3753633981',
'3753634021',
'3753634041',
'3753634111',
'3753634271',
'3753622431',
'3753644141',
'3753645051',
'3753645261',
'3753647021',
'3745498320',
'3751978420',
'3751978950');
--执行计划：
-----------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 232 | 325 (1)| 00:00:05 | | |
| 1 | NESTED LOOPS OUTER | | 2 | 232 | 325 (1)| 00:00:05 | | |
| 2 | NESTED LOOPS | | 2 | 128 | 322 (1)| 00:00:05 | | |
| 3 | NESTED LOOPS | | 12 | 576 | 310 (1)| 00:00:05 | | |
|* 4 | HASH JOIN | | 12 | 420 | 274 (1)| 00:00:04 | | |
| 5 | PARTITION RANGE ALL | | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 |
| 6 | INLIST ITERATOR | | | | | | | |
| 7 | TABLE ACCESS BY LOCAL INDEX ROWID| TB_BA_SERV_HIST | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 |
|* 8 | INDEX RANGE SCAN | IX_BA_SERVSERVID_HIST | 98 | | 100 (1)| 00:00:02 | 1 | 39 |
| 9 | PARTITION RANGE ALL | | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 |
| 10 | TABLE ACCESS BY LOCAL INDEX ROWID | ORDER_ITEM_HIST | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 |
|* 11 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 | | 79 (0)| 00:00:02 | 1 | 39 |
| 12 | TABLE ACCESS BY INDEX ROWID | TB_BA_ACTION_HIST | 1 | 13 | 3 (0)| 00:00:01 | | |
|* 13 | INDEX RANGE SCAN | IX_BA_ACT_SUBSID_HIST | 1 | | 2 (0)| 00:00:01 | | |
|* 14 | TABLE ACCESS BY INDEX ROWID | TB_PM_ACTION | 1 | 16 | 1 (0)| 00:00:01 | | |
|* 15 | INDEX UNIQUE SCAN | PK_PM_ACTION | 1 | | 0 (0)| 00:00:01 | | |
|* 16 | TABLE ACCESS BY INDEX ROWID | TB_BA_CHANNELSTAFF | 1 | 52 | 2 (0)| 00:00:01 | | |
|* 17 | INDEX UNIQUE SCAN | PK_CHANNELSTAFF_SUBS_ID | 1 | | 1 (0)| 00:00:01 | | |
-----------------------------------------------------------------------------------------------------------------------------------
--方法2：/*+cardinality(a,220647)*/
SELECT XSY_CODE,--发展销售员编码
SLY_CODE,--受理销售员编码
XSD_CODE,--销售点编码
DZS_CODE,--店中商编码
JYZT_CODE--销售员所属经营主体编码
FROM (select <span style="color:#ff0000;">/*+cardinality(a,220647)*/</span>a.subs_id,c.serv_id,b.action_id,d.action_type,a.stat,a.stat_date
from crm_gz.tb_ba_subscription_hist a,
crm_gz.tb_ba_action_hist b,
crm_gz.tb_ba_serv_hist c,
crm_gz.tb_pm_action d
where a.subs_id=b.subs_id and a.subs_id=c.subs_id and b.action_id=d.action_id
and d.city_id='200' and a.stat='S0C') a,
(select * from crm_gz.tb_ba_channelstaff
where modi_date>=to_date('20141123','yyyymmdd')) b
WHERE a.subs_id=b.subs_id(+)
and a.stat_date>=to_date('20141123','yyyymmdd')
and ((a.action_type='NEW' and a.action_id not in(14030,14266,7021))
or a.action_id in(14099,14260,6448))
AND SERV_ID in ('3751990561',
'3751991941',
'3751992281',
'3751992431',
'3751992831',
'3751994541',
'3751994561',
'3753633921',
'3753633981',
'3753634021',
'3753634041',
'3753634111',
'3753634271',
'3753622431',
'3753644141',
'3753645051',
'3753645261',
'3753647021',
'3745498320',
'3751978420',
'3751978950');
--执行计划：
-----------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
-----------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 1624 | 679 (1)| 00:00:10 | | |
|* 1 | HASH JOIN OUTER | | 14 | 1624 | 679 (1)| 00:00:10 | | |
| 2 | NESTED LOOPS | | 14 | 896 | 667 (1)| 00:00:10 | | |
| 3 | NESTED LOOPS | | 98 | 4704 | 569 (1)| 00:00:08 | | |
|* 4 | HASH JOIN | | 98 | 3430 | 275 (2)| 00:00:04 | | |
| 5 | PARTITION RANGE ALL | | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 |
| 6 | INLIST ITERATOR | | | | | | | |
| 7 | TABLE ACCESS BY LOCAL INDEX ROWID| TB_BA_SERV_HIST | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 |
|* 8 | INDEX RANGE SCAN | IX_BA_SERVSERVID_HIST | 98 | | 100 (1)| 00:00:02 | 1 | 39 |
| 9 | PARTITION RANGE ALL | | 220K| 4309K| 88 (0)| 00:00:02 | 1 | 39 |
| 10 | TABLE ACCESS BY LOCAL INDEX ROWID | ORDER_ITEM_HIST | 220K| 4309K| 88 (0)| 00:00:02 | 1 | 39 |
|* 11 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 | | 79 (0)| 00:00:02 | 1 | 39 |
| 12 | TABLE ACCESS BY INDEX ROWID | TB_BA_ACTION_HIST | 1 | 13 | 3 (0)| 00:00:01 | | |
|* 13 | INDEX RANGE SCAN | IX_BA_ACT_SUBSID_HIST | 1 | | 2 (0)| 00:00:01 | | |
|* 14 | TABLE ACCESS BY INDEX ROWID | TB_PM_ACTION | 1 | 16 | 1 (0)| 00:00:01 | | |
|* 15 | INDEX UNIQUE SCAN | PK_PM_ACTION | 1 | | 0 (0)| 00:00:01 | | |
| 16 | TABLE ACCESS BY INDEX ROWID | TB_BA_CHANNELSTAFF | 19 | 988 | 11 (0)| 00:00:01 | | |
|* 17 | INDEX RANGE SCAN | IDX_BA_CHANNELSTAFF_MODI_DATE | 19 | | 3 (0)| 00:00:01 | | |
-----------------------------------------------------------------------------------------------------------------------------------------
<span style="color:#ff0000;">于是，将方法告诉开发人员，结果本地执行还是很慢，查看执行计划，因为dblink的关系，用上面的2种方法都没生效。
那怎么办呢，用了各种hint都没法让他走hash，于是想到了查询块。
</span>
--原来的执行计划和outline信息：
PLAN_TABLE_OUTPUT
-----------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 931544562
--------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | Inst |
--------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT REMOTE | | 2 | 232 | 296 (0)| 00:00:05 | | | |
|* 1 | TABLE ACCESS BY LOCAL INDEX ROWID | TB_BA_SERV_HIST | 1 | 15 | 79 (0)| 00:00:02 | | | GZODSD |
| 2 | NESTED LOOPS | | 2 | 232 | 296 (0)| 00:00:05 | | | |
| 3 | NESTED LOOPS OUTER | | 2 | 202 | 139 (0)| 00:00:02 | | | |
| 4 | NESTED LOOPS | | 2 | 98 | 136 (0)| 00:00:02 | | | |
| 5 | NESTED LOOPS | | 12 | 396 | 124 (0)| 00:00:02 | | | |
| 6 | PARTITION RANGE ALL | | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 | |
| 7 | TABLE ACCESS BY LOCAL INDEX ROWID| ORDER_ITEM_HIST | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 | GZODSD |
|* 8 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 | | 79 (0)| 00:00:02 | 1 | 39 | GZODSD |
| 9 | TABLE ACCESS BY INDEX ROWID | TB_BA_ACTION_HIST | 1 | 13 | 3 (0)| 00:00:01 | | | GZODSD |
|* 10 | INDEX RANGE SCAN | IX_BA_ACT_SUBSID_HIST | 1 | | 2 (0)| 00:00:01 | | | GZODSD |
|* 11 | TABLE ACCESS BY INDEX ROWID | TB_PM_ACTION | 1 | 16 | 1 (0)| 00:00:01 | | | GZODSD |
|* 12 | INDEX UNIQUE SCAN | PK_PM_ACTION | 1 | | 0 (0)| 00:00:01 | | | GZODSD |
|* 13 | TABLE ACCESS BY INDEX ROWID | TB_BA_CHANNELSTAFF | 1 | 52 | 2 (0)| 00:00:01 | | | GZODSD |
|* 14 | INDEX UNIQUE SCAN | PK_CHANNELSTAFF_SUBS_ID | 1 | | 1 (0)| 00:00:01 | | | GZODSD |
| 15 | PARTITION RANGE ALL | | 1 | | 78 (0)| 00:00:02 | 1 | 39 | |
|* 16 | INDEX RANGE SCAN | IX_BA_SERVSUBSID_HIST | 1 | | 78 (0)| 00:00:02 | 1 | 39 | GZODSD |
--------------------------------------------------------------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$F5BB74E1 / A3@SEL$1
7 - SEL$F5BB74E1 / ORDER_ITEM_HIST@SEL$2
8 - SEL$F5BB74E1 / ORDER_ITEM_HIST@SEL$2
9 - SEL$F5BB74E1 / A4@SEL$1
10 - SEL$F5BB74E1 / A4@SEL$1
11 - SEL$F5BB74E1 / A2@SEL$1
12 - SEL$F5BB74E1 / A2@SEL$1
13 - SEL$F5BB74E1 / A1@SEL$1
14 - SEL$F5BB74E1 / A1@SEL$1
16 - SEL$F5BB74E1 / A3@SEL$1
Outline Data
-------------
/*+
BEGIN_OUTLINE_DATA
USE_NL(@"SEL$F5BB74E1" "A3"@"SEL$1")
USE_NL(@"SEL$F5BB74E1" "A1"@"SEL$1")
USE_NL(@"SEL$F5BB74E1" "A2"@"SEL$1")
USE_NL(@"SEL$F5BB74E1" "A4"@"SEL$1")
LEADING(@"SEL$F5BB74E1" "ORDER_ITEM_HIST"@"SEL$2" "A4"@"SEL$1" "A2"@"SEL$1" "A1"@"SEL$1" "A3"@"SEL$1")
INDEX(@"SEL$F5BB74E1" "A3"@"SEL$1" ("TB_BA_SERV_HIST"."SUBS_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A1"@"SEL$1" ("TB_BA_CHANNELSTAFF"."SUBS_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A2"@"SEL$1" ("TB_PM_ACTION"."ACTION_ID" "TB_PM_ACTION"."CITY_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A4"@"SEL$1" ("TB_BA_ACTION_HIST"."SUBS_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "ORDER_ITEM_HIST"@"SEL$2" ("ORDER_ITEM_HIST"."STAT" "ORDER_ITEM_HIST"."STATUS_DATE"))
OUTLINE(@"SEL$2")
OUTLINE(@"SEL$1")
MERGE(@"SEL$2")
OUTLINE_LEAF(@"SEL$F5BB74E1")
ALL_ROWS
OPTIMIZER_FEATURES_ENABLE('10.2.0.4')
IGNORE_OPTIM_EMBEDDED_HINTS
END_OUTLINE_DATA
*/
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("A3"."SERV_ID"=3745498320 OR "A3"."SERV_ID"=3751978420 OR "A3"."SERV_ID"=3751978950 OR "A3"."SERV_ID"=3751990561 OR
"A3"."SERV_ID"=3751991941 OR "A3"."SERV_ID"=3751992281 OR "A3"."SERV_ID"=3751992431 OR "A3"."SERV_ID"=3751992831 OR
"A3"."SERV_ID"=3751994541 OR "A3"."SERV_ID"=3751994561 OR "A3"."SERV_ID"=3753622431 OR "A3"."SERV_ID"=3753633921 OR
"A3"."SERV_ID"=3753633981 OR "A3"."SERV_ID"=3753634021 OR "A3"."SERV_ID"=3753634041 OR "A3"."SERV_ID"=3753634111 OR
"A3"."SERV_ID"=3753634271 OR "A3"."SERV_ID"=3753644141 OR "A3"."SERV_ID"=3753645051 OR "A3"."SERV_ID"=3753645261 OR
"A3"."SERV_ID"=3753647021)
8 - access("STAT"='S0C' AND "STATUS_DATE">=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
10 - access("ORDER_ITEM_ID"="A4"."SUBS_ID")
11 - filter("A2"."ACTION_TYPE"='NEW' AND "A4"."ACTION_ID"<>14030 AND "A4"."ACTION_ID"<>14266 AND "A4"."ACTION_ID"<>7021 OR
"A4"."ACTION_ID"=6448 OR "A4"."ACTION_ID"=14099 OR "A4"."ACTION_ID"=14260)
12 - access("A4"."ACTION_ID"="A2"."ACTION_ID" AND "A2"."CITY_ID"='200')
13 - filter("A1"."MODI_DATE"(+)>=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
14 - access("ORDER_ITEM_ID"="A1"."SUBS_ID"(+))
16 - access("ORDER_ITEM_ID"="A3"."SUBS_ID")
认真观察了下qb name和outline，因为a表是视图，指向ORDER_ITEM_HIST。很显然a表的qb name就是ORDER_ITEM_HIST@SEL$2
c表是执行计划id=1的地方，对应的qb name是1 - SEL$F5BB74E1 / A3@SEL$1，因此可用下面的方法优化。
--优化后：
SELECT <span style="color:#ff0000;">/*+leading(A3@SEL$1,ORDER_ITEM_HIST@SEL$2)*/</span>
XSY_CODE,--发展销售员编码
SLY_CODE,--受理销售员编码
XSD_CODE,--销售点编码
DZS_CODE,--店中商编码
JYZT_CODE--销售员所属经营主体编码
FROM (select a.subs_id,c.serv_id,b.action_id,d.action_type,a.stat,a.stat_date
from crm_gz.tb_ba_subscription_hist@togzodsd a,
crm_gz.tb_ba_action_hist@togzodsd b,
crm_gz.tb_ba_serv_hist@togzodsd c,
crm_gz.tb_pm_action@togzodsd d
where a.subs_id=b.subs_id and a.subs_id=c.subs_id and b.action_id=d.action_id
and d.city_id='200' and a.stat='S0C') a,
(select * from crm_gz.tb_ba_channelstaff@togzodsd
where modi_date>=to_date('20141123','yyyymmdd')) b
WHERE a.subs_id=b.subs_id(+)
and a.stat_date>=to_date('20141123','yyyymmdd')
and ((a.action_type='NEW' and a.action_id not in(14030,14266,7021))
or a.action_id in(14099,14260,6448))
AND SERV_ID in ('3751990561',
'3751991941',
'3751992281',
'3751992431',
'3751992831',
'3751994541',
'3751994561',
'3753633921',
'3753633981',
'3753634021',
'3753634041',
'3753634111',
'3753634271',
'3753622431',
'3753644141',
'3753645051',
'3753645261',
'3753647021',
'3745498320',
'3751978420',
'3751978950');
--执行计划和outline
--------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | Inst |
--------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT REMOTE | | 2 | 232 | 325 (1)| 00:00:05 | | | |
| 1 | NESTED LOOPS OUTER | | 2 | 232 | 325 (1)| 00:00:05 | | | |
| 2 | NESTED LOOPS | | 2 | 128 | 322 (1)| 00:00:05 | | | |
| 3 | NESTED LOOPS | | 12 | 576 | 310 (1)| 00:00:05 | | | |
|* 4 | HASH JOIN | | 12 | 420 | 274 (1)| 00:00:04 | | | |
| 5 | PARTITION RANGE ALL | | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 | |
| 6 | INLIST ITERATOR | | | | | | | | |
| 7 | TABLE ACCESS BY LOCAL INDEX ROWID| TB_BA_SERV_HIST | 98 | 1470 | 185 (1)| 00:00:03 | 1 | 39 | GZODSD |
|* 8 | INDEX RANGE SCAN | IX_BA_SERVSERVID_HIST | 98 | | 100 (1)| 00:00:02 | 1 | 39 | GZODSD |
| 9 | PARTITION RANGE ALL | | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 | |
| 10 | TABLE ACCESS BY LOCAL INDEX ROWID | ORDER_ITEM_HIST | 12 | 240 | 88 (0)| 00:00:02 | 1 | 39 | GZODSD |
|* 11 | INDEX RANGE SCAN | IXH_ORDERITEM_STATDATE | 12 | | 79 (0)| 00:00:02 | 1 | 39 | GZODSD |
| 12 | TABLE ACCESS BY INDEX ROWID | TB_BA_ACTION_HIST | 1 | 13 | 3 (0)| 00:00:01 | | | GZODSD |
|* 13 | INDEX RANGE SCAN | IX_BA_ACT_SUBSID_HIST | 1 | | 2 (0)| 00:00:01 | | | GZODSD |
|* 14 | TABLE ACCESS BY INDEX ROWID | TB_PM_ACTION | 1 | 16 | 1 (0)| 00:00:01 | | | GZODSD |
|* 15 | INDEX UNIQUE SCAN | PK_PM_ACTION | 1 | | 0 (0)| 00:00:01 | | | GZODSD |
|* 16 | TABLE ACCESS BY INDEX ROWID | TB_BA_CHANNELSTAFF | 1 | 52 | 2 (0)| 00:00:01 | | | GZODSD |
|* 17 | INDEX UNIQUE SCAN | PK_CHANNELSTAFF_SUBS_ID | 1 | | 1 (0)| 00:00:01 | | | GZODSD |
--------------------------------------------------------------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$F5BB74E1
7 - SEL$F5BB74E1 / A3@SEL$1
8 - SEL$F5BB74E1 / A3@SEL$1
10 - SEL$F5BB74E1 / ORDER_ITEM_HIST@SEL$2
11 - SEL$F5BB74E1 / ORDER_ITEM_HIST@SEL$2
12 - SEL$F5BB74E1 / A4@SEL$1
13 - SEL$F5BB74E1 / A4@SEL$1
14 - SEL$F5BB74E1 / A2@SEL$1
15 - SEL$F5BB74E1 / A2@SEL$1
16 - SEL$F5BB74E1 / A1@SEL$1
17 - SEL$F5BB74E1 / A1@SEL$1
Outline Data
-------------
/*+
BEGIN_OUTLINE_DATA
USE_NL(@"SEL$F5BB74E1" "A1"@"SEL$1")
USE_NL(@"SEL$F5BB74E1" "A2"@"SEL$1")
USE_NL(@"SEL$F5BB74E1" "A4"@"SEL$1")
USE_HASH(@"SEL$F5BB74E1" "ORDER_ITEM_HIST"@"SEL$2")
LEADING(@"SEL$F5BB74E1" "A3"@"SEL$1" "ORDER_ITEM_HIST"@"SEL$2" "A4"@"SEL$1" "A2"@"SEL$1" "A1"@"SEL$1")
INDEX_RS_ASC(@"SEL$F5BB74E1" "A1"@"SEL$1" ("TB_BA_CHANNELSTAFF"."SUBS_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A2"@"SEL$1" ("TB_PM_ACTION"."ACTION_ID" "TB_PM_ACTION"."CITY_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A4"@"SEL$1" ("TB_BA_ACTION_HIST"."SUBS_ID"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "ORDER_ITEM_HIST"@"SEL$2" ("ORDER_ITEM_HIST"."STAT" "ORDER_ITEM_HIST"."STATUS_DATE"))
INDEX_RS_ASC(@"SEL$F5BB74E1" "A3"@"SEL$1" ("TB_BA_SERV_HIST"."SERV_ID"))
OUTLINE(@"SEL$2")
OUTLINE(@"SEL$1")
MERGE(@"SEL$2")
OUTLINE_LEAF(@"SEL$F5BB74E1")
ALL_ROWS
OPTIMIZER_FEATURES_ENABLE('10.2.0.4')
IGNORE_OPTIM_EMBEDDED_HINTS
END_OUTLINE_DATA
*/
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("ORDER_ITEM_ID"="A3"."SUBS_ID")
8 - access("A3"."SERV_ID"=3745498320 OR "A3"."SERV_ID"=3751978420 OR "A3"."SERV_ID"=3751978950 OR "A3"."SERV_ID"=3751990561 OR
"A3"."SERV_ID"=3751991941 OR "A3"."SERV_ID"=3751992281 OR "A3"."SERV_ID"=3751992431 OR "A3"."SERV_ID"=3751992831 OR
"A3"."SERV_ID"=3751994541 OR "A3"."SERV_ID"=3751994561 OR "A3"."SERV_ID"=3753622431 OR "A3"."SERV_ID"=3753633921 OR
"A3"."SERV_ID"=3753633981 OR "A3"."SERV_ID"=3753634021 OR "A3"."SERV_ID"=3753634041 OR "A3"."SERV_ID"=3753634111 OR
"A3"."SERV_ID"=3753634271 OR "A3"."SERV_ID"=3753644141 OR "A3"."SERV_ID"=3753645051 OR "A3"."SERV_ID"=3753645261 OR
"A3"."SERV_ID"=3753647021)
11 - access("STAT"='S0C' AND "STATUS_DATE">=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
13 - access("ORDER_ITEM_ID"="A4"."SUBS_ID")
14 - filter("A2"."ACTION_TYPE"='NEW' AND "A4"."ACTION_ID"<>14030 AND "A4"."ACTION_ID"<>14266 AND "A4"."ACTION_ID"<>7021 OR
"A4"."ACTION_ID"=6448 OR "A4"."ACTION_ID"=14099 OR "A4"."ACTION_ID"=14260)
15 - access("A4"."ACTION_ID"="A2"."ACTION_ID" AND "A2"."CITY_ID"='200')
16 - filter("A1"."MODI_DATE"(+)>=TO_DATE(' 2014-11-23 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
17 - access("ORDER_ITEM_ID"="A1"."SUBS_ID"(+))
Note
-----
- fully remote statement
优化前3分钟多才出结果，优化后27秒出结果了。至此，已经没有必要优化了。
原文地址：http://blog.csdn.net/gdmzlhj1/article/details/41443547
