上海的一个哥们问我有个SQL跑了4个小时都没跑完，实在受不了了，找我优化一下。我确实挺佩服他的，要是我遇到跑了几分钟的，就受不了了。
SQL语句和执行计划如下：
--sql id：1qbbw3th4x8yc
SELECT "VOUCHER".FID "ID",
"ENTRIES".FID "ENTRIES.ID",
"ENTRIES".FEntryDC "ENTRIES.ENTRYDC",
"ACCOUNT".FID "ACCOUNT.ID",
"ENTRIES".FCurrencyID "CURRENCY.ID",
"PERIOD".FNumber "PERIOD.NUMBER",
"ENTRIES".FSeq "ENTRIES.SEQ",
"ENTRIES".FLocalExchangeRate "LOCALEXCHANGERATE",
"ENTRIES".FReportingExchangeRate "REPORTINGEXCHANGERATE",
"ENTRIES".FMeasureUnitID "ENTRYMEASUREUNIT.ID",
"ASSISTRECORDS".FID "ASSISTRECORDS.ID",
"ASSISTRECORDS".FSeq "ASSISTRECORDS.SEQ",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FOriginalAmount
ELSE
"ASSISTRECORDS".FOriginalAmount
END "ASSISTRECORDS.ORIGINALAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FLocalAmount
ELSE
"ASSISTRECORDS".FLocalAmount
END "ASSISTRECORDS.LOCALAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FReportingAmount
ELSE
"ASSISTRECORDS".FReportingAmount
END "ASSISTRECORDS.REPORTINGAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FQuantity
ELSE
"ASSISTRECORDS".FQuantity
END "ASSISTRECORDS.QUANTITY",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FStandardQuantity
ELSE
"ASSISTRECORDS".FStandardQuantity
END "ASSISTRECORDS.STANDARDQTY",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FPrice
ELSE
"ASSISTRECORDS".FPrice
END "ASSISTRECORDS.PRICE",
CASE
WHEN ("ACCOUNT".FCAA IS NULL) THEN
NULL
ELSE
"ASSISTRECORDS".FAssGrpID
END "ASSGRP.ID"
FROM T_GL_Voucher "VOUCHER"
LEFT OUTER JOIN T_BD_Period "PERIOD"
ON "VOUCHER".FPeriodID = "PERIOD".FID
INNER JOIN T_GL_VoucherEntry "ENTRIES"
ON "VOUCHER".FID = "ENTRIES".FBillID
INNER JOIN T_BD_AccountView "ACCOUNT"
ON "ENTRIES".FAccountID = "ACCOUNT".FID
LEFT OUTER JOIN T_GL_VoucherAssistRecord "ASSISTRECORDS"
ON "ENTRIES".FID = "ASSISTRECORDS".FEntryID
WHERE "VOUCHER".FID IN
(SELECT "VOUCHER".FID "ID"
FROM T_GL_Voucher "VOUCHER"
INNER JOIN T_GL_VoucherEntry "ENTRIES"
ON "VOUCHER".FID = "ENTRIES".FBillID
INNER JOIN T_BD_AccountView "ACCOUNT"
ON "ENTRIES".FAccountID = "ACCOUNT".FID
INNER JOIN t_bd_accountview PAV
ON ((INSTR("ACCOUNT".flongnumber, pav.flongnumber) = 1 AND
pav.faccounttableid = "ACCOUNT".faccounttableid) AND
pav.fcompanyid = "ACCOUNT".fcompanyid)
WHERE (("VOUCHER".FCompanyID IN ('fSSF82rRSKexM3KKN1d0tMznrtQ=')) AND
(("VOUCHER".FBizStatus IN (5)) AND
((("VOUCHER".FPeriodID IN ('+wQxkBFVRiKnV7OniceMDoI4jEw=')) AND
"ENTRIES".FCurrencyID =
'dfd38d11-00fd-1000-e000-1ebdc0a8100dDEB58FDC') AND
(pav.FID IN ('vyPiKexLRXiyMb41VSVVzJ2pmCY='))))))
ORDER BY "ID" ASC, "ENTRIES.SEQ" ASC, "ASSISTRECORDS.SEQ" ASC
--执行计划
--------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
--------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 13 | 5733 | 486 (1)|
| 1 | SORT ORDER BY | | 13 | 5733 | 486 (1)|
| 2 | VIEW | VM_NWVW_2 | 13 | 5733 | 486 (1)|
| 3 | HASH UNIQUE | | 13 | 11115 | 486 (1)|
| 4 | NESTED LOOPS OUTER | | 13 | 11115 | 485 (1)|
| 5 | NESTED LOOPS | | 9 | 6606 | 471 (1)|
| 6 | NESTED LOOPS | | 9 | 6057 | 467 (1)|
| 7 | MERGE JOIN OUTER | | 1 | 473 | 459 (1)|
| 8 | HASH JOIN | | 1 | 427 | 458 (1)|
| 9 | NESTED LOOPS | | | | |
| 10 | NESTED LOOPS | | 258 | 83850 | 390 (0)|
| 11 | NESTED LOOPS | | 6 | 1332 | 3 (0)|
| 12 | TABLE ACCESS BY INDEX ROWID| T_BD_ACCOUNTVIEW | 1 | 111 | 2 (0)|
| 13 | INDEX UNIQUE SCAN | PK_BD_ACCOUNTVIEW | 1 | | 1 (0)|
| 14 | INDEX RANGE SCAN | IX_BD_ACTCOMLNUM | 6 | 666 | 1 (0)|
| 15 | INDEX RANGE SCAN | IX_GL_VCHAACCT | 489 | | 1 (0)|
| 16 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERENTRY | 42 | 4326 | 65 (0)|
| 17 | INDEX RANGE SCAN | IX_GL_VCH_11 | 7536 | 750K| 68 (0)|
| 18 | BUFFER SORT | | 1 | 46 | 391 (0)|
| 19 | INDEX RANGE SCAN | IX_PERIOD_ENC | 1 | 46 | 1 (0)|
| 20 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERENTRY | 17 | 3400 | 8 (0)|
| 21 | INDEX RANGE SCAN | IX_GL_VCHENTRYFQ1 | 17 | | 1 (0)|
| 22 | TABLE ACCESS BY INDEX ROWID | T_BD_ACCOUNTVIEW | 1 | 61 | 1 (0)|
| 23 | INDEX UNIQUE SCAN | PK_BD_ACCOUNTVIEW | 1 | | 1 (0)|
| 24 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERASSISTRECORD | 1 | 121 | 2 (0)|
| 25 | INDEX RANGE SCAN | IX_GL_VCHASSREC_11 | 2 | | 1 (0)|
--------------------------------------------------------------------------------------------------------
Note
-----
- 'PLAN_TABLE' is old version
我靠 plan_table is old version....一般遇到这种执行计划发给我 我是理都不理的，但是 这哥们关系好，算了吧 勉为其难。
那我就不从执行计划 入手优化了，直接分析sql语句优化。这个sql挺简单的，from 后面几个表， where 有个 in ，最后有个order by
问他 in 后面返回多少记录
落落 17:11:46
哦
你先看 where in 里面跑多久
上海-咖啡迷 17:12:40
很快
23s 16880rows
其他表大小如下
看到这些就知道怎么优化了 。之前跑4个小时不出结果，那行嘛 我给你优化到1分钟
in 只返回16880条数据，那么可以用in作为驱动表去驱动 T_GL_Voucher
思路 就跟 这个博客一样的 http://blog.csdn.net/robinson1988/article/details/10551467 我靠 居然还个sb在乱评论
因为in里面有点复杂，不好用hint，我偷懒，难得去搞了，直接 用下面的sql 优化
with x as (SELECT /*+ materialize */ "VOUCHER".FID "ID"
FROM T_GL_Voucher "VOUCHER"
INNER JOIN T_GL_VoucherEntry "ENTRIES"
ON "VOUCHER".FID = "ENTRIES".FBillID
INNER JOIN T_BD_AccountView "ACCOUNT"
ON "ENTRIES".FAccountID = "ACCOUNT".FID
INNER JOIN t_bd_accountview PAV
ON ((INSTR("ACCOUNT".flongnumber, pav.flongnumber) = 1 AND
pav.faccounttableid = "ACCOUNT".faccounttableid) AND
pav.fcompanyid = "ACCOUNT".fcompanyid)
WHERE (("VOUCHER".FCompanyID IN ('fSSF82rRSKexM3KKN1d0tMznrtQ=')) AND
(("VOUCHER".FBizStatus IN (5)) AND
((("VOUCHER".FPeriodID IN ('+wQxkBFVRiKnV7OniceMDoI4jEw=')) AND
"ENTRIES".FCurrencyID =
'dfd38d11-00fd-1000-e000-1ebdc0a8100dDEB58FDC') AND
(pav.FID IN ('vyPiKexLRXiyMb41VSVVzJ2pmCY='))))))
SELECT "VOUCHER".FID "ID",
"ENTRIES".FID "ENTRIES.ID",
"ENTRIES".FEntryDC "ENTRIES.ENTRYDC",
"ACCOUNT".FID "ACCOUNT.ID",
"ENTRIES".FCurrencyID "CURRENCY.ID",
"PERIOD".FNumber "PERIOD.NUMBER",
"ENTRIES".FSeq "ENTRIES.SEQ",
"ENTRIES".FLocalExchangeRate "LOCALEXCHANGERATE",
"ENTRIES".FReportingExchangeRate "REPORTINGEXCHANGERATE",
"ENTRIES".FMeasureUnitID "ENTRYMEASUREUNIT.ID",
"ASSISTRECORDS".FID "ASSISTRECORDS.ID",
"ASSISTRECORDS".FSeq "ASSISTRECORDS.SEQ",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FOriginalAmount
ELSE
"ASSISTRECORDS".FOriginalAmount
END "ASSISTRECORDS.ORIGINALAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FLocalAmount
ELSE
"ASSISTRECORDS".FLocalAmount
END "ASSISTRECORDS.LOCALAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FReportingAmount
ELSE
"ASSISTRECORDS".FReportingAmount
END "ASSISTRECORDS.REPORTINGAMOUNT",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FQuantity
ELSE
"ASSISTRECORDS".FQuantity
END "ASSISTRECORDS.QUANTITY",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FStandardQuantity
ELSE
"ASSISTRECORDS".FStandardQuantity
END "ASSISTRECORDS.STANDARDQTY",
CASE
WHEN (("ACCOUNT".FCAA IS NULL) AND
("ACCOUNT".FhasUserProperty <> 1)) THEN
"ENTRIES".FPrice
ELSE
"ASSISTRECORDS".FPrice
END "ASSISTRECORDS.PRICE",
CASE
WHEN ("ACCOUNT".FCAA IS NULL) THEN
NULL
ELSE
"ASSISTRECORDS".FAssGrpID
END "ASSGRP.ID"
FROM T_GL_Voucher "VOUCHER"
LEFT OUTER JOIN T_BD_Period "PERIOD"
ON "VOUCHER".FPeriodID = "PERIOD".FID
INNER JOIN T_GL_VoucherEntry "ENTRIES"
ON "VOUCHER".FID = "ENTRIES".FBillID
INNER JOIN T_BD_AccountView "ACCOUNT"
ON "ENTRIES".FAccountID = "ACCOUNT".FID
LEFT OUTER JOIN T_GL_VoucherAssistRecord "ASSISTRECORDS"
ON "ENTRIES".FID = "ASSISTRECORDS".FEntryID
WHERE "VOUCHER".FID IN
(select id from x)
ORDER BY "ID" ASC, "ENTRIES.SEQ" ASC, "ASSISTRECORDS.SEQ" ASC
---======执行计划
------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 24 | 11208 | 506 (1)|
| 1 | TEMP TABLE TRANSFORMATION | | | | |
| 2 | LOAD AS SELECT | SYS_TEMP_0FD9D6853_1AD5C99D | | | |
| 3 | HASH JOIN | | 1 | 415 | 458 (1)|
| 4 | NESTED LOOPS | | | | |
| 5 | NESTED LOOPS | | 258 | 83850 | 390 (0)|
| 6 | NESTED LOOPS | | 6 | 1332 | 3 (0)|
| 7 | TABLE ACCESS BY INDEX ROWID| T_BD_ACCOUNTVIEW | 1 | 111 | 2 (0)|
| 8 | INDEX UNIQUE SCAN | PK_BD_ACCOUNTVIEW | 1 | | 1 (0)|
| 9 | INDEX RANGE SCAN | IX_BD_ACTCOMLNUM | 6 | 666 | 1 (0)|
| 10 | INDEX RANGE SCAN | IX_GL_VCHAACCT | 489 | | 1 (0)|
| 11 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERENTRY | 42 | 4326 | 65 (0)|
| 12 | INDEX RANGE SCAN | IX_GL_VCH_11 | 7536 | 662K| 68 (0)|
| 13 | SORT ORDER BY | | 24 | 11208 | 48 (5)|
| 14 | NESTED LOOPS OUTER | | 24 | 11208 | 47 (3)|
| 15 | NESTED LOOPS | | 17 | 6086 | 21 (5)|
| 16 | NESTED LOOPS | | 17 | 5253 | 13 (8)|
| 17 | NESTED LOOPS OUTER | | 1 | 121 | 5 (20)|
| 18 | NESTED LOOPS | | 1 | 87 | 4 (25)|
| 19 | VIEW | VW_NSO_1 | 1 | 29 | 2 (0)|
| 20 | HASH UNIQUE | | 1 | 24 | |
| 21 | VIEW | | 1 | 24 | 2 (0)|
| 22 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6853_1AD5C99D | 1 | 29 | 2 (0)|
| 23 | INDEX RANGE SCAN | IX_GL_VCH_FIDCMPNUM | 1 | 58 | 1 (0)|
| 24 | INDEX RANGE SCAN | IX_PERIOD_ENC | 1 | 34 | 1 (0)|
| 25 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERENTRY | 17 | 3196 | 8 (0)|
| 26 | INDEX RANGE SCAN | IX_GL_VCHENTRYFQ1 | 17 | | 1 (0)|
| 27 | TABLE ACCESS BY INDEX ROWID | T_BD_ACCOUNTVIEW | 1 | 49 | 1 (0)|
| 28 | INDEX UNIQUE SCAN | PK_BD_ACCOUNTVIEW | 1 | | 1 (0)|
| 29 | TABLE ACCESS BY INDEX ROWID | T_GL_VOUCHERASSISTRECORD | 1 | 109 | 2 (0)|
| 30 | INDEX RANGE SCAN | IX_GL_VCHASSREC_11 | 2 | | 1 (0)|
------------------------------------------------------------------------------------------------------
最后 1分钟全部查询出来，42956条数据
其实这个sql 没有 优化彻底，如果真的要认真对待，大概30秒左右就能跑完 不过难得搞了
有sql 要优化 加我qq 692162374 或者 加 群 220761024
想要跟我学优化的，请点击这里
最后我才知道 这个哥们 18k了 现在 我操。。。。他跟我学了ORACLE sql优化大概4个月了