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Today I would like to give you another example that seems to me very useful. This is a database checkpoint SPI implementation. Let me say some words about checkpoints. GridGain uses checkpoints to store interim task or job results somewhere (by default it's a shared file system but it has Oracle Coherence and GigaSpaces implementations as well). But the most useful case as I see it is a database. Jobs that takes long time definitely need a storage where they will keep calculation results and all people I know think that database is a right place.