troubleshooting Question

MySQL best way to merge two large tables

Avatar of Jim Youmans
Jim YoumansFlag for United States of America asked on
* importMySQL ServerLinux* CentOS
3 Comments1 Solution14 ViewsLast Modified:
MySQL 5.6 on Centos 7
I have two very large tables (table A has 65 million rows and table B has 135 million rows) that I need to merge into a third table (lets call it table C).  Table C is partitioned on the CREATED_TS column.  A and B are identical except that they come from different "sources" and so in table C there is an extra column call OrigSource that has a code in it.
I have created a stored proc that cycles through each table and inserts 50K to 100K rows at a time but my issue is that it takes forever to run.  For Table A it took 10-12 hours and for table B it is still running after about 18 hours.
Is there a better, faster way to do this?  Can I export the tables with MySQLDump or something and then reinsert them into the new table?  Is there some kind of utility that will do this in a faster way?
Any suggestions would be greatly appreciated .  Thank you.
Tomas Helgi Johannsson
Database Administrator / Software Engineer

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