# pt-online-schema-change

**URL:** <https://forums.percona.com/t/pt-online-schema-change/4712>\
**Category:** Percona Toolkit\
**Created:** [February 9, 2016, 8:54am UTC](https://forums.percona.com/t/pt-online-schema-change/4712 "2016-02-09T08:54:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tsmgeek](https://avatars.discourse-cdn.com/v4/letter/t/90db22/32.png) [@tsmgeek](https://forums.percona.com/u/tsmgeek)\
**Post date:** [February 9, 2016, 8:54am UTC](https://forums.percona.com/t/pt-online-schema-change/4712/1 "2016-02-09T08:54:18Z")

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I am using the tool to rebuild a table while compressing it.  
The remaining time gets up to 99% 00:00 but it is still going for a long time.  
I am looking at the process list and see that it is not even half way though data (going by PK ID).  
Amy ideas why the progress/remain time is way off.

Variable\_name,Value  
innodb\_version,5.6.28-76.1  
protocol\_version,10  
slave\_type\_conversions,  
version,5.6.28-76.1-log  
version\_comment,Percona Server (GPL), Release 76.1, Revision 5759e76  
version\_compile\_machine,x86\_64  
version\_compile\_os,Linux