Re: XA transaction isolation level and ACID properties

[Aaron Staley]

Well, the documentation isn't telling me what isn't working. It just says I'm not achieving ACID properties, but what is "ACID" isn't even defined.

For instance, wikipedia defines isolation as "The isolation property ensures that the concurrent execution of transactions results in a system state that would be obtained if transactions were executed serially", but the only serialization level that strictly ensures that is the case is SERIALIZABLE.

So to re-iterate:
1. Are using isolation modes lower than READ REPEATED even considered "ACID" (in the context of the MYSQL docs) in the first place?
2. If so, what isolation properties, relative to the expectation of READ COMMITTED transactions, are violated by using XA transactions in READ COMMITTED isolation mode?