EmergencyEMERGENCY? Get 24/7 Help Now!

Using innodb_sys_tables and innodb_sys_indexes

 | June 15, 2012 |  Posted In: Insight for DBAs, MySQL


I was playing with Percona Server today and found fast_index_creation does not work quite exactly like described in the manual. The point I’m looking to make though it would be very hard to catch this problem without additional
information_schema tables we added in Percona Server.

I was doing simple ALTER TABLE such as: “alter table sbtest add z int not null;” which I expected would create table with primary key only copy the data to it and when create secondary key by sort. Looking at innodb_sys_tables and innodb_sys_indexes I discovered it is not the case:

Looking around I found post by Alexey Kopytov which states you also need to set expand_fast_index_creation=1 if you want this feature to work… and indeed it does.

This table same ALTER TABLE works taking advantage of this feature.

Peter Zaitsev

Peter managed the High Performance Group within MySQL until 2006, when he founded Percona. Peter has a Master's Degree in Computer Science and is an expert in database kernels, computer hardware, and application scaling.

Leave a Reply


Percona’s widely read Percona Database Performance blog highlights our expertise in enterprise-class software, support, consulting and managed services solutions for both MySQL® and MongoDB® across traditional and cloud-based platforms. The decades of experience represented by our consultants is found daily in numerous and relevant blog posts.

Besides specific database help, the blog also provides notices on upcoming events and webinars.
Want to get weekly updates listing the latest blog posts? Subscribe to our blog now! Submit your email address below and we’ll send you an update every Friday at 1pm ET.

No, thank you. Please do not ask me again.