ORA-1652: unable to extend temp segment by 128 in tablespace

系统临时表空间已经达到64G， 可是依然报ORA-1652错误，如今业务申请扩展临时表空间到128g。

  通过抓取AWR报告，发现以下几条sql语句执行时间最长，通过分析 发现 大部分是 “MINUS ”和“insert into select......”类型语句。重点关注 MINUS。

看Top10事件，direct path write temp 出现次数不少，大量等待User I/O，查看执行时间最长的SQL：

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INSERT INTO CAMS_ACCT_TEMP03 SELECT * FROM CAMS_ACCT_TEMP01 A WHERE NOT EXISTS(SELECT 1 FROM CAMS_ACCT_TEMP03 B WHERE A.ACCT_NO = B.ACCT_NO) MINUS SELECT * FROM CAMS_ACCT_TEMP02 A WHERE NOT EXISTS(SELECT 1 FROM CAMS_ACCT_TEMP03 B WHERE A.ACCT_NO = B.ACCT_NO)；

 

  INSERT INTO CAMS_CUST_TEMP03 SELECT * FROM CAMS_CUST_TEMP01 MINUS SELECT * FROM CAMS_CUST_TEMP02；

 

INSERT INTO CAMS_SUB_ACCT_TEMP (COMPANY, OPEN_BANK, ACCT_NO, SUB_ACCT_NO, INTERNAL_KEY) (SELECT COMPANY, OPEN_BANK, ACCT_NO, SUB_ACCT_NO, INTERNAL_KEY FROM    INTF_CAMS_SUB_ACCT WHERE DATA_DATE = :B1 MINUS SELECT COMPANY, OPEN_BANK, ACCT_NO, SUB_ACCT_NO, INTERNAL_KEY FROM INTF_CAMS_SUB_ACCT WHERE DATA_DATE = :B2 )；

 

INSERT INTO CAMS_CARD_INFO_TEMP03 SELECT * FROM CAMS_CARD_INFO_TEMP01 MINUS SELECT * FROM CAMS_CARD_INFO_TEMP02；

 

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INSERT INTO CAMS_CUST_TEMP01 (COMPANY , ORG_CODE , CUST_NO , CUST_NAME , CERTI_KIND , CERTI_NO , EFFECTIVE_DATE , ISSUE_ORGAN_REGION , IDENTITY_KIND , COUNTRY , SEX , POST_CODE , ADDRESS , TEL , DATA_STATE , AUDITING_STATE , ERROR_REASON , REPORT_DATE , REPORT_FILE , UPD_USER , UPD_TIME ) SELECT COMPANY , ORG_CODE , CUST_NO , CUST_NAME , CERTI_KIND , CERTI_NO , EFFECTIVE_DATE , ISSUE_ORGAN_REGION , IDENTITY_KIND , COUNTRY , SEX , POST_CODE , ADDRESS , TEL , DATA_STATE , AUDITING_STATE , ERROR_REASON , REPORT_DATE , REPORT_FILE , UPD_USER , UPD_TIME FROM INTF_CAMS_CUST A WHERE A.DATA_DATE = :B1；

首先咱们来了解下 ‘MINUS’函数，minus主要做用在于取两个 集合/表 补集，就相似对两个集合排序 而后相似冒泡算法对比去重。

 

抓了2个sql的执行计划，能够发现使用了大量的temp排序，一条sql执行消耗800+MB的temp 排序，能够经过 not in ,not exists 来改写，实际工做中，not in比not exists要好。

对于须要排序的列，能够适当创建索引，走索引扫描能够避免额外排序。

SQL1:

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-------------------------------------

SELECT * FROM IGRSVISE.CAMS_ACCT_TEMP01 A WHERE NOT EXISTS( SELECT 1 FROM IGRSVISE.CAMS_ACCT_TEMP03 B WHERE A.ACCT_NO = B.ACCT_NO) 

MINUS

SELECT * FROM IGRSVISE.CAMS_ACCT_TEMP02 A WHERE NOT EXISTS( SELECT 1 FROM IGRSVISE.CAMS_ACCT_TEMP03 B WHERE A.ACCT_NO = B.ACCT_NO)

SQL2:

INSERT INTO CAMS_CUST_TEMP03 SELECT * FROM IGRSVISE.CAMS_CUST_TEMP01 MINUS SELECT * FROM IGRSVISE.CAMS_CUST_TEMP02

改写成以下 not in 

SQL3 :

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INSERT INTO CAMS_CUST_TEMP01 (COMPANY ,ORG_CODE ,CUST_NO ,CUST_NAME
,CERTI_KIND ,CERTI_NO ,EFFECTIVE_DATE ,ISSUE_ORGAN_REGION
,IDENTITY_KIND ,COUNTRY ,SEX ,POST_CODE ,ADDRESS ,TEL ,DATA_STATE
,AUDITING_STATE ,ERROR_REASON ,REPORT_DATE ,REPORT_FILE ,UPD_USER
,UPD_TIME ) SELECT COMPANY ,ORG_CODE ,CUST_NO ,CUST_NAME ,CERTI_KIND
,CERTI_NO ,EFFECTIVE_DATE ,ISSUE_ORGAN_REGION ,IDENTITY_KIND ,COUNTRY
,SEX ,POST_CODE ,ADDRESS ,TEL ,DATA_STATE ,AUDITING_STATE ,ERROR_REASON
,REPORT_DATE ,REPORT_FILE ,UPD_USER ,UPD_TIME FROM INTF_CAMS_CUST A
WHERE A.DATA_DATE = :B1

SQL4：

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INSERT INTO CAMS_CARD_INFO_TEMP01 (COMPANY, ORG_CODE, CARD_NO,IS_PRIMARY_CARD, MATURITY_DATE, ACCT_MEDIUM, CLOSED_DATE, CARD_STATUS,ERROR_REASON, REPORT_DATE, REPORT_FILE, UPD_USER, UPD_TIME,MAIN_CARD_NO ) 
SELECT COMPANY, ORG_CODE, CARD_NO, IS_PRIMARY_CARD,MATURITY_DATE, ACCT_MEDIUM, CLOSED_DATE, CARD_STATUS, ERROR_REASON,REPORT_DATE, REPORT_FILE, UPD_USER, UPD_TIME, MAIN_CARD_NO FROM INTF_CAMS_CARD_INFO A WHERE A.DATA_DATE = :B1

临时表还有一种优化方法，相似这种：

with 
cr as 
( 
    select code from product where Name like 'C%' 
)

select * from product where code in (select * from cr)