Solved

drop index during the time we clone a MySQL table.

Posted on 2013-11-21
9
368 Views
Last Modified: 2013-12-03
Dear all,

Any way to drop the index during the time we clone a table by :


CREATE TABLE IF NOT EXISTS Table B LIKE Table A

Open in new window


which B will copy everything from A when this command execute and not need extra AFTER script manual method?
0
Comment
Question by:marrowyung
  • 6
  • 2
9 Comments
 
LVL 48

Accepted Solution

by:
PortletPaul earned 250 total points
ID: 39668237
This isn't possible. This is what the LIKE option does according to documentation:
Use LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table:
You will have to follow-up with subsequent commends (as already provided) to remove any auto-increments and primary key.

forgot the url:
http://dev.mysql.com/doc/refman/5.0/en/create-table.html
0
 
LVL 1

Author Comment

by:marrowyung
ID: 39668292
so I have to drop manually anyway ?
0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 39668321
manually? that is up to you.

what you cannot do is expect there to be some magic parameter to

             create table audit.x like source. x with magic drop unwanted bits

that magic you have to provide, which "might" be scripted - but again that is up to you.
0
 
LVL 43

Assisted Solution

by:Chris Stanyon
Chris Stanyon earned 250 total points
ID: 39668599
String the queries together:

CREATE TABLE IF NOT EXISTS TableB LIKE TableA; ALTER TABLE TableB DROP yourColumn;

Open in new window

If it's just the INDEX you want to drop and not the Column:

DROP INDEX `PRIMARY` ON TableB;

Open in new window

0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 
LVL 1

Author Comment

by:marrowyung
ID: 39670878
ChrisStanyon,

This means this logic is not automated, I can't use dynamic SQL for it, build a lot recently and see if anything we can check from schema level and, if index found, constraint is found, drop it.
0
 
LVL 1

Author Comment

by:marrowyung
ID: 39670883
0
 
LVL 1

Author Comment

by:marrowyung
ID: 39673870
If this is the table structure:

CREATE TABLE `YYYY` (
  `SCHED_NAME` varchar(120) NOT NULL,
  `TRIGGER_NAME` varchar(200) NOT NULL,
  `TRIGGER_GROUP` varchar(200) NOT NULL,
  `CRON_EXPRESSION` varchar(120) NOT NULL,
  `TIME_ZONE_ID` varchar(80) DEFAULT NULL,
  PRIMARY KEY (`SCHED_NAME`,`TRIGGER_NAME`,`TRIGGER_GROUP`),
  KEY `SCHED_NAME` (`SCHED_NAME`,`TRIGGER_NAME`,`TRIGGER_GROUP`),
  CONSTRAINT `QRTZ_CRON_TRIGGERS_ibfk_1` FOREIGN KEY (`SCHED_NAME`, `TRIGGER_NAME`, `TRIGGER_GROUP`) REFERENCES `QRTZ_TRIGGERS` (`SCHED_NAME`, `TRIGGER_NAME`, `TRIGGER_GROUP`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Open in new window


Then after I clone the table using "like", the just issue:

DROP INDEX `PRIMARY` ON YYYY; 

Open in new window


I read this :
stackoverflow.com/questions/3798524/mysql-dropping-all-indexes-from-table?s=ca15d66a-5c5f-459f-80f5-58430b24626e#new-answer

can the SHOW INDEX FROM <table thing> plugable to the cursor and let we loop that one by one ?
0
 
LVL 1

Author Comment

by:marrowyung
ID: 39676663
0
 
LVL 1

Author Comment

by:marrowyung
ID: 39677186
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

All XML, All the Time; More Fun MySQL Tidbits – Dynamically Generate XML via Stored Procedure in MySQL Extensible Markup Language (XML) and database systems, a marriage we are seeing more and more of.  So the topics of parsing and manipulating XM…
I have been using r1soft Continuous Data Protection (http://www.r1soft.com/linux-cdp/) for many years now with the mySQL Addon and wanted to share a trick I have used several times. For those of us that don't have the luxury of using all transact…
Need to grow your business through quality cloud solutions? With everything required to build a cloud platform and solution, you may feel like the distance between you and the cloud is quite long. Help is here. Spend some time learning about the Con…
A company’s greatest vulnerability is their email. CEO fraud, ransomware and spear phishing attacks are the no1 threat to a company’s security. Cybercrime is responsible for the largest loss of money to companies today with losses projected to r…

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now