Consistency across key value stores with shared journals

摘要

A method is provided for a transaction manager in a database system to provide consistency across multiple persistent key-value (KV) stores, each having its own non-persistent transactions, for modifications to the persistent KV stores that must all persist or none at all. The method includes joining a first KV store's transaction and joining a second KV store's transaction. For a set of modifications including a first modification to the first KV store and a second modification to the second KV store that must all persist or none at all, the method includes inserting the first modification into the first KV store's transaction, inserting the second modification into the second KV store's transaction, and creating and writing a combined journal entry including first and second sub-entries describing the first and the second modifications in a persistent global journal, respectively.