MySQL中怎么利用pt-duplicate-key-checker找出冗余、重復(fù)索引

MySQL中怎么利用pt-duplicate-key-checker找出冗余、重復(fù)索引，相信很多沒(méi)有經(jīng)驗(yàn)的人對(duì)此束手無(wú)策，為此本文總結(jié)了問(wèn)題出現(xiàn)的原因和解決方法，通過(guò)這篇文章希望你能解決這個(gè)問(wèn)題。

解壓pt軟件
# tar xfz percona-toolkit-3.0.2_x86_64.tar.gz

安裝對(duì)應(yīng)的perl依賴包
# yum install perl-DBI
# yum install perl-DBD-MySQL

執(zhí)行pt-duplicate-key-checker命令

1. # ./bin/pt-duplicate-key-checker -uroot -pcnstrong#123454321 -S /data/mysql01/mysql.sock
   

2. # ########################################################################
   

3. # beike.ls_lesson
   

4. # ########################################################################
   

5. 
   

6. # index_lesson_classSubjId is a left-prefix of index_lesson_classSubjId_startTime
   

7. # Key definitions:
   

8. #   KEY `index_lesson_classSubjId` (`classSubjId`),
   

9. #   KEY `index_lesson_classSubjId_startTime` (`classSubjId`,`startTime`)
   

10. # Column types:
    

11. #     `classsubjid` bigint(20) default null comment '????id'
    

12. #     `starttime` timestamp null default null comment '????'
    

13. # To remove this duplicate index, execute:
    

14. ALTER TABLE `beike`.`ls_lesson` DROP INDEX `index_lesson_classSubjId`;
    

15. 
    

16. # ########################################################################
    

17. # course.QRTZ_BLOB_TRIGGERS
    

18. # ########################################################################
    

19. 
    

20. # SCHED_NAME is a duplicate of PRIMARY
    

21. # Key definitions:
    

22. #   KEY `SCHED_NAME` (`SCHED_NAME`,`TRIGGER_NAME`,`TRIGGER_GROUP`),
    

23. #   PRIMARY KEY (`SCHED_NAME`,`TRIGGER_NAME`,`TRIGGER_GROUP`),
    

24. # Column types:
    

25. #     `sched_name` varchar(120) not null
    

26. #     `trigger_name` varchar(200) not null
    

27. #     `trigger_group` varchar(200) not null
    

28. # To remove this duplicate index, execute:
    

29. ALTER TABLE `course`.`QRTZ_BLOB_TRIGGERS` DROP INDEX `SCHED_NAME`;
    

30. 
    

31. # ########################################################################
    

32. # course.QRTZ_FIRED_TRIGGERS
    

33. # ########################################################################
    

34. 
    

35. # IDX_QRTZ_FT_TRIG_INST_NAME is a left-prefix of IDX_QRTZ_FT_INST_JOB_REQ_RCVRY
    

36. # Key definitions:
    

37. #   KEY `IDX_QRTZ_FT_TRIG_INST_NAME` (`SCHED_NAME`,`INSTANCE_NAME`),
    

38. #   KEY `IDX_QRTZ_FT_INST_JOB_REQ_RCVRY` (`SCHED_NAME`,`INSTANCE_NAME`,`REQUESTS_RECOVERY`),
    

39. # Column types:
    

40. #     `sched_name` varchar(120) not null
    

41. #     `instance_name` varchar(200) not null
    

42. #     `requests_recovery` varchar(1) default null
    

43. # To remove this duplicate index, execute:
    

44. ALTER TABLE `course`.`QRTZ_FIRED_TRIGGERS` DROP INDEX `IDX_QRTZ_FT_TRIG_INST_NAME`;

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