Create temporary tables in read only transaction - MYSQL 5.7

Question

I am currently assisting with integration testing for migrating an application that currently runs against a mysql 5.5 DB to mysql 5.7. We have run into issues related to functionality that was optimised in mysql 5.5 to run about 30% faster by having certain parts be encapsulated in a read only transaction now throwing the below error:

Error Code: 1792 Cannot execute statement in a READ ONLY transaction.

I have scoured the internet and havent found any solutions. I know there is a related limitation added in mysql 5.6 documentation that mentions:

"In read-only mode, it remains possible to change tables created with the TEMPORARY keyword using DML statements. Changes made with DDL statements are not permitted, just as with permanent tables."

This presents a major limitation to us as some of these read only transactions call stored procedures that create temporary tables and it is not feasible for us to rewrite the application as this read only optimisation is widespread.

Essentially we are hoping to find a work around or a configuration we can tweak to allow the below example to not give a read only error.

START TRANSACTION READ only;
CREATE TEMPORARY TABLE IF NOT EXISTS table1 (account_id INT(10) UNSIGNED);
ROLLBACK;

Creating the table beforehand is not an option, mysql server session variables below if required. Any help would be much appreciated!

Session Variables:

Variable_name   Value
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*/ EDIT 1 */ We have decided to abandon the read only optimisations that were put in place for MySql 5.5 as we were unable to resolve this roadblock.

Answer 1

I know this is an old question but we have ended up finding a very easy solution to this problem.

The solution was simple as to not execute the stored procedure calls within a transaction. The only extra care we had to make was to ensure none of the affected stored procedures would make data change but apart from that the solutions was as simple as that.