&platform=AIX&function=fixId&fixids=aix64-server*FP007&includeSupersedes=0&source=fc
从explain上看,性能问题是复杂的exists子查询导致的,执行计划使用了NLJOIN,但是右边的分支BT_AUDIT_HALL_TURN_IN表IDX_SMALT_CODE索引查询效率不好。
默认在DIAGPATH目录下如何改变输出路径:/RPT path The path to place report output file (optional). /RPTN file-name The name of the report file (optional).详细的帮助db2dart /H
调试复杂SQL的性能,建议用排除法,先查一下这个耗时多久:SELECT TI.HALLNAME,TI.SMALT_CODE,TI.PAYMONEYDATE,TI.AMOUNT,TI.AUDITSTATE,TI.HALLCODE,TI.GATHERTYPE,TI.MONEYTYPE,TI.CORP_CODE,TI.ID,TI.REMARK FROM BT_A
db2icrt - Create instance commandFor Linux and UNIX operating systems: InstName Specifies the name of the instance which is also the name of an existing user in the operating system. The instance name
按不同的顺序delete,就会发生死锁啊T1时刻:session 1:e95fp7@suse1:~> db2 +c "delete from test1 where c1=1" DB20000I The SQL command completed successfully.session 2:e95fp7@suse1:~> db2 +c
define SQLB_DATA 0x00#define SQLB_INDEX 0x01#define SQLB_LF 0x02#define SQLB_LOB 0x03#define SQLB_LOBA 0x04#define SQLB_BMP 0x05#define SQLB_XDA 0x06#define SQLB_PERMANENT 0x00#define SQLB_REORG 0x10#
runstats表后,查SYSCAT.TABLES视图这两个列:NPAGES、FPAGESNPAGES: Total number of pages on which the rows of the table existFPAGES: Total number of pages
User names, as used by MySQL for authentication purposes, have nothing to do with user names(login names) as used by Windows or Unix.
以下SQL占用了大量的时间,也是受影响的SQL,buffer busy waits很高。insert into mcc_asyn_pos ( suid, oemcode, commaddr, utc, dst, apc, lat, lon, head, speed, distance, tflag, vflag, ost, ostdesc ) values ( :
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