性能调整或替代distinct子句

时间:2015-07-20 08:47:29

标签: sql oracle sql-tuning

我的查询带有一个不同的子句:

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(+);

此查询返回10,146行,执行时间差不多135秒

解释计划是:

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,它会在4秒内执行但是查询返回10163行,这意味着它也会返回重复的行。

这是没有明确条款的执行计划:

 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distinct子句的任何替代方法来调整此查询。

我的数据库版本是:

  

Oracle Database 11g企业版11.2.0.3.0版 - 64位生产

1 个答案:

答案 0 :(得分:0)

我通过取出函数然后在外部查询上选择那些列来包装整个不同的查询。应该减少函数调用的数量,并且这种方式也应该更快。

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(+)
    )