----- Original Message -----
From: Vinay
To: mysql@stripped
Sent: Wednesday, March 01, 2006 5:00 PM
Subject: Enforcing Isolation in MySQL database
Hello ,
I suppose the InnoDB tables in Mysql have REPEATABLE-READ as the default
isolation. Is the concurrency enforced automatically by the database or is there anything
the application programmer has to do to make sure the data consistent.
How does the REPEATABLE-READ resolve the following scenario.
User1 opens a application and reads a row on the screen.
User2 opens the same application and read the same row on the screen.
User2 updates a field (and commits ,as the autocommit is on),
User1 still is reading the non-updated row , and updates the same field updated by the
User2 to different value.
How does it affect the database when normal select , update queries are used.
What should the application programmer to enforce database concurrency.
Thank you,
Vinay
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