Fix set tx_isolation command (#2043)
Fix set tx_isolation command (#2043)

The command line setting the tx_isolation variable seems to be incorrect. The value being set in the command line was 'REPEATABLE-READ', while all other references in the documentation lead me to believe it should be 'READ-COMMITTED'.

In my experience, I had several stability issues with Orca using a MySQL instance on Google Cloud SQL, and the problem was at least partially resolved by updating tx_isolation from 'REPEATABLE-READ' to 'READ-COMMITTED'.
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