我有一个具有不同子句的查询:
SELECT -- /*+ first_rows */
distinct a.sub_id, b.status,
pkg_sp_subbrief.get_sub_typ (a.sub_id) sub_type,
c.svc_provider_nm, fn_sp_get_svc_plan (a.sub_id) svc_plan,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'contact.name.salutation'
) salutation,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'first_name'
) first_name,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'contact.name.middle'
) middle_name,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'last_name'
) last_name,
pkg_sp_subbrief.get_sub_parm (a.sub_id, 'company_name') company_name,
pkg_sp_subbrief.get_sub_parm (a.sub_id, 'itc_account') itc_accout,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'phones.home.number'
) phone_number,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'address_1'
) addr_home_address,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'city'
) addr_home_city,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'prov'
) addr_home_prov,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'postal_cd'
) addr_home_postal_code,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'country'
) addr_home_country,
e.val cm_mta_mac, ' ' telephone_number,
pkg_sp_subbrief.get_subsvc_parm_first (a.sub_id,
3374
) alpha_tag,
NVL (j.voipdn1, ' ') voip_dn1,
NVL (j.mtavoiceport, ' ') mta_voice_port
FROM svc_provider c,
ref_status b,
sub a,
sub_svc d,
sub_svc_parm e,
(SELECT f.sub_id, g.val voipdn1, i.val mtavoiceport
FROM sub_svc f, sub_svc_parm g, sub_svc_parm i
WHERE f.svc_id = SvcId('smp_dial_tone_access')
AND f.sub_svc_status_id ! = 29
AND f.sub_svc_id = g.sub_svc_id
AND g.parm_id = get_cgo_parm_id('voip_dn1', GET_CLASS_ID('SubSvcSpec'), SvcID('smp_dial_tone_access'))
AND f.sub_svc_id = i.sub_svc_id
AND i.parm_id = 20410) j
WHERE a.svc_provider_id = c.svc_provider_id
AND a.sub_status_id = b.status_id
AND a.sub_id = d.sub_id
AND d.sub_svc_id = e.sub_svc_id
AND (e.parm_id = 1254 OR e.parm_id = 20249)
AND d.sub_svc_status_id != 29
AND a.sub_status_id != 9
AND a.sub_id = j.sub_id(+);
这个查询返回给我10,146行，执行时间几乎是135秒
解释计划如下:
Execution Plan
----------------------------------------------------------
Plan hash value: 2622307916
-----------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10409 | 1118K| | 2540 (4)| 00:00:31 |
| 1 | HASH UNIQUE | | 10409 | 1118K| 1240K| 2540 (4)| 00:00:31 |
|* 2 | HASH JOIN RIGHT OUTER | | 10409 | 1118K| | 2279 (4)| 00:00:28 |
| 3 | VIEW | | 899 | 23374 | | 1340 (6)| 00:00:17 |
|* 4 | HASH JOIN | | 899 | 53940 | | 1340 (6)| 00:00:17 |
|* 5 | HASH JOIN | | 885 | 35400 | | 918 (8)| 00:00:12 |
|* 6 | TABLE ACCESS BY INDEX ROWID| SUB_SVC | 877 | 17540 | | 434 (0)| 00:00:06 |
|* 7 | INDEX RANGE SCAN | SUB_SVC_IX2 | 951 | | | 3 (0)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | SUB_SVC_PARM | 1770 | 35400 | | 483 (14)| 00:00:06 |
|* 9 | TABLE ACCESS FULL | SUB_SVC_PARM | 2632 | 52640 | | 422 (2)| 00:00:06 |
|* 10 | HASH JOIN | | 10409 | 853K| | 939 (2)| 00:00:12 |
|* 11 | TABLE ACCESS FULL | REF_STATUS | 95 | 2280 | | 3 (0)| 00:00:01 |
|* 12 | HASH JOIN | | 10409 | 609K| | 935 (2)| 00:00:12 |
| 13 | VIEW | index$_join$_001 | 49 | 588 | | 3 (34)| 00:00:01 |
|* 14 | HASH JOIN | | | | | | |
| 15 | INDEX FAST FULL SCAN | SVC_PROVIDER_PK | 49 | 588 | | 1 (0)| 00:00:01 |
| 16 | INDEX FAST FULL SCAN | SVC_PROVIDER_UK1 | 49 | 588 | | 1 (0)| 00:00:01 |
|* 17 | HASH JOIN | | 10409 | 487K| | 932 (2)| 00:00:12 |
|* 18 | TABLE ACCESS FULL | SUB | 8777 | 111K| | 53 (0)| 00:00:01 |
|* 19 | HASH JOIN | | 10607 | 362K| | 878 (2)| 00:00:11 |
|* 20 | TABLE ACCESS FULL | SUB_SVC_PARM | 10607 | 207K| | 423 (2)| 00:00:06 |
|* 21 | TABLE ACCESS FULL | SUB_SVC | 90284 | 1322K| | 454 (1)| 00:00:06 |
-----------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("A"."SUB_ID"="J"."SUB_ID"(+))
4 - access("F"."SUB_SVC_ID"="I"."SUB_SVC_ID")
5 - access("F"."SUB_SVC_ID"="G"."SUB_SVC_ID")
6 - filter("F"."SUB_SVC_STATUS_ID"<>29)
7 - access("F"."SVC_ID"="SVCID"('smp_dial_tone_access'))
8 - filter("G"."PARM_ID"="GET_CGO_PARM_ID"('voip_dn1',"GET_CLASS_ID" ('SubSvcSpec'),"SVCID"('smp_dial_tone_access')))
9 - filter("I"."PARM_ID"=20410)
10 - access("A"."SUB_STATUS_ID"="B"."STATUS_ID")
11 - filter("B"."STATUS_ID"<>9)
12 - access("A"."SVC_PROVIDER_ID"="C"."SVC_PROVIDER_ID")
14 - access(ROWID=ROWID)
17 - access("A"."SUB_ID"="D"."SUB_ID")
18 - filter("A"."SUB_STATUS_ID"<>9)
19 - access("D"."SUB_SVC_ID"="E"."SUB_SVC_ID")
20 - filter("E"."PARM_ID"=1254 OR "E"."PARM_ID"=20249)
21 - filter("D"."SUB_SVC_STATUS_ID"<>29)
Statistics
----------------------------------------------------------
470461 recursive calls
0 db block gets
13591783 consistent gets
0 physical reads
0 redo size
1272441 bytes sent via SQL*Net to client
7960 bytes received via SQL*Net from client
678 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
10146 rows processed
当我从查询中删除distinct子句时，它在4秒内执行，但是query返回10163行，这意味着它也返回重复的行。
这是没有distinct子句的执行计划:
Execution Plan
----------------------------------------------------------
Plan hash value: 3514824003
---------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10409 | 3608K| 2279 (4)| 00:00:28 |
|* 1 | HASH JOIN RIGHT OUTER | | 10409 | 3608K| 2279 (4)| 00:00:28 |
| 2 | VIEW | | 899 | 237K| 1340 (6)| 00:00:17 |
|* 3 | HASH JOIN | | 899 | 53940 | 1340 (6)| 00:00:17 |
|* 4 | HASH JOIN | | 885 | 35400 | 918 (8)| 00:00:12 |
|* 5 | TABLE ACCESS BY INDEX ROWID| SUB_SVC | 877 | 17540 | 434 (0)| 00:00:06 |
|* 6 | INDEX RANGE SCAN | SUB_SVC_IX2 | 951 | | 3 (0)| 00:00:01 |
|* 7 | TABLE ACCESS FULL | SUB_SVC_PARM | 1770 | 35400 | 483 (14)| 00:00:06 |
|* 8 | TABLE ACCESS FULL | SUB_SVC_PARM | 2632 | 52640 | 422 (2)| 00:00:06 |
|* 9 | HASH JOIN | | 10409 | 853K| 939 (2)| 00:00:12 |
|* 10 | TABLE ACCESS FULL | REF_STATUS | 95 | 2280 | 3 (0)| 00:00:01 |
|* 11 | HASH JOIN | | 10409 | 609K| 935 (2)| 00:00:12 |
| 12 | VIEW | index$_join$_001 | 49 | 588 | 3 (34)| 00:00:01 |
|* 13 | HASH JOIN | | | | | |
| 14 | INDEX FAST FULL SCAN | SVC_PROVIDER_PK | 49 | 588 | 1 (0)| 00:00:01 |
| 15 | INDEX FAST FULL SCAN | SVC_PROVIDER_UK1 | 49 | 588 | 1 (0)| 00:00:01 |
|* 16 | HASH JOIN | | 10409 | 487K| 932 (2)| 00:00:12 |
|* 17 | TABLE ACCESS FULL | SUB | 8777 | 111K| 53 (0)| 00:00:01 |
|* 18 | HASH JOIN | | 10607 | 362K| 878 (2)| 00:00:11 |
|* 19 | TABLE ACCESS FULL | SUB_SVC_PARM | 10607 | 207K| 423 (2)| 00:00:06 |
|* 20 | TABLE ACCESS FULL | SUB_SVC | 90284 | 1322K| 454 (1)| 00:00:06 |
----------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("A"."SUB_ID"="J"."SUB_ID"(+))
3 - access("F"."SUB_SVC_ID"="I"."SUB_SVC_ID")
4 - access("F"."SUB_SVC_ID"="G"."SUB_SVC_ID")
5 - filter("F"."SUB_SVC_STATUS_ID"<>29)
6 - access("F"."SVC_ID"="SVCID"('smp_dial_tone_access'))
7 - filter("G"."PARM_ID"="GET_CGO_PARM_ID"('voip_dn1',"GET_CLASS_ID" ('SubSvcSpec'),"SVCID"('smp_dial_tone_access')))
8 - filter("I"."PARM_ID"=20410)
9 - access("A"."SUB_STATUS_ID"="B"."STATUS_ID")
10 - filter("B"."STATUS_ID"<>9)
11 - access("A"."SVC_PROVIDER_ID"="C"."SVC_PROVIDER_ID")
13 - access(ROWID=ROWID)
16 - access("A"."SUB_ID"="D"."SUB_ID")
17 - filter("A"."SUB_STATUS_ID"<>9)
18 - access("D"."SUB_SVC_ID"="E"."SUB_SVC_ID")
19 - filter("E"."PARM_ID"=1254 OR "E"."PARM_ID"=20249)
20 - filter("D"."SUB_SVC_STATUS_ID"<>29)
Statistics
----------------------------------------------------------
470461 recursive calls
0 db block gets
13592455 consistent gets
0 physical reads
0 redo size
1168343 bytes sent via SQL*Net to client
7971 bytes received via SQL*Net from client
679 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
10163 rows processed
所以我正在寻找任何替代distinct子句来调优这个查询。
我的数据库版本是:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
我将通过取出函数然后在外部查询中选择这些列来包装整个不同的查询。这样可以减少函数调用的数量，并且速度更快。
SELECT *, pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'contact.name.salutation'
) salutation,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'first_name'
) first_name,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'contact.name.middle'
) middle_name,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'last_name'
) last_name,
pkg_sp_subbrief.get_sub_parm (a.sub_id, 'company_name') company_name,
pkg_sp_subbrief.get_sub_parm (a.sub_id, 'itc_account') itc_accout,
pkg_sp_subbrief.get_sub_contact_parm
(a.sub_id,
'phones.home.number'
) phone_number,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'address_1'
) addr_home_address,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'city'
) addr_home_city,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'prov'
) addr_home_prov,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'postal_cd'
) addr_home_postal_code,
pkg_sp_subbrief.get_location_parm
(a.sub_id,
'country'
) addr_home_country,
pkg_sp_subbrief.get_subsvc_parm_first (a.sub_id,
3374
) alpha_tag,
fn_sp_get_svc_plan (a.sub_id) svc_plan,
pkg_sp_subbrief.get_sub_typ (a.sub_id) sub_type
FROM (
SELECT -- /*+ first_rows */
distinct a.sub_id, b.status,
c.svc_provider_nm,
e.val cm_mta_mac, ' ' telephone_number,
NVL (j.voipdn1, ' ') voip_dn1,
NVL (j.mtavoiceport, ' ') mta_voice_port
FROM svc_provider c,
ref_status b,
sub a,
sub_svc d,
sub_svc_parm e,
(SELECT f.sub_id, g.val voipdn1, i.val mtavoiceport
FROM sub_svc f, sub_svc_parm g, sub_svc_parm i
WHERE f.svc_id = SvcId('smp_dial_tone_access')
AND f.sub_svc_status_id ! = 29
AND f.sub_svc_id = g.sub_svc_id
AND g.parm_id = get_cgo_parm_id('voip_dn1', GET_CLASS_ID('SubSvcSpec'), SvcID('smp_dial_tone_access'))
AND f.sub_svc_id = i.sub_svc_id
AND i.parm_id = 20410) j
WHERE a.svc_provider_id = c.svc_provider_id
AND a.sub_status_id = b.status_id
AND a.sub_id = d.sub_id
AND d.sub_svc_id = e.sub_svc_id
AND (e.parm_id = 1254 OR e.parm_id = 20249)
AND d.sub_svc_status_id != 29
AND a.sub_status_id != 9
AND a.sub_id = j.sub_id(+)
)