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  1. Many database applications execute transactions under a weaker isolation level, such as READ COMMITTED. This often leads to concurrency bugs that look like race conditions in multi-threaded programs. While this problem is well known, philosophies of how to address this problem vary a lot, ranging from making a SERIALIZABLE database faster to living with weaker isolation and the consequence of concurrency bugs. This paper studies the consequences, root causes, and how developers fix 93 real-world concurrency bugs in database applications. We observe that, on the one hand, developers still prefer preventing these bugs from happening. On the other hand, database systems are not providing sufficient support for this task, so developers often fix these bugs using ad-hoc solutions, which are often complicated and not fully correct. We further discuss research opportunities to improve concurrency control in database implementations. 
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