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Move MVCC docs to top-level docs directory
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docs/internals/mvcc/DESIGN.md
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docs/internals/mvcc/DESIGN.md
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# Design
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## Persistent storage
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Persistent storage must implement the `Storage` trait that the MVCC module uses for transaction logging.
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Figure 1 shows an example of write-ahead log across three transactions.
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The first transaction T0 executes a `INSERT (id) VALUES (1)` statement, which results in a log record with `id` set to `1`, begin timestamp to 0 (which is the transaction ID) and end timestamp as infinity (meaning the row version is still visible).
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The second transaction T1 executes another `INSERT` statement, which adds another log record to the transaction log with `id` set to `2`, begin timesstamp to 1 and end timestamp as infinity, similar to what T0 did.
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Finally, a third transaction T2 executes two statements: `DELETE WHERE id = 1` and `INSERT (id) VALUES (3)`. The first one results in a log record with `id` set to `1` and begin timestamp set to 0 (which is the transaction that created the entry). However, the end timestamp is now set to 2 (the current transaction), which means the entry is now deleted.
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The second statement results in an entry in the transaction log similar to the `INSERT` statements in T0 and T1.
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<p align="center">
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Figure 1. Transaction log of three transactions.
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</p>
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When MVCC bootstraps or recovers, it simply redos the transaction log.
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If the transaction log grows big, we can checkpoint it it by dropping all entries that are no longer visible after the the latest transaction and create a snapshot.
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656
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