Shulou(Shulou.com)06/01 Report--

Preface

Database transactions cover a wide range of knowledge and concepts. Transactions have the characteristics of ACID, how to ensure the implementation of ACID features in high concurrent transaction access, and really match or match the business scenarios of the database operated by everyone, so the concept of transaction isolation level is produced to ensure the ACID characteristics of database transactions.

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There are several ways or methods for oracle to generate transaction transaction without gossip. The figure above is shown below for details:

If the relationship between the transaction generated by the above three transactions and different transaction isolation levels is not clear, you can see the following figure

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