Optimize Table or MySQL Settings for Update/Inner-Join a large table

Question

This is related to a question I recently posted:

Efficient way to flag a record with min field value and common fieldX value in mysql

but similar errors are occurring on other queries that previously worked such as:

Update TableA as T1
Inner Join TableA as T2  
on T1.Field1=T2.FIeld1and T1.Field2 is not NULL
set T2.GroupFlag=T1.GroupFlag

All of a sudden, I am getting:

ERROR 1206 (HY000): The total number of locks exceeds the lock table size

I have run this before several times on this same table and it worked, so clearly the query is OK.

I know this question is sort of vague, but I'm not sure how else to ask it. Is there something in MySQL settings that I should check? We did recently restore a backup of the database to a new (this) server, but the only difference, as far as I know, is that we doubled the size of the server to give us room to work with.

UPDATE:

I did find this:

https://major.io/2010/02/16/mysql-the-total-number-of-locks-exceeds-the-lock-table-size-2/

which basically states that my innodb_buffer_pool is too small. I checked and our new server, though larger, never had the old settings of 2GB migrated and we only have 128MB.

so I will ask SysAdmin/DevOps to try this and report back to this question if it solves the issue (vs just removing the question since perhaps it will help someone else eventually).

Answer 1

Ok so answer to the question was Mysql settings. Apparently when we migrated servers DevOps/SysAdmin did migrate settings but didn't restart server as I jumped right into query-mode. We restarted last night and things worked swimmingly.

The issue was that innodb_buffer_pool was set to 128MB by default and our custom settings had it at 2GB.