sqlite3/vfs/mvcc

Go mvcc SQLite VFS

This package implements the EXPERIMENTAL "mvcc" in-memory SQLite VFS.

It has some benefits over the "memdb" VFS:

• panics do not corrupt a shared database,
• single-writer not blocked by readers,
• readers never block,
• instant snapshots.

mvcc.TestDB is the preferred way to setup an in-memory database for testing when you intend to leverage snapshots, e.g. to setup many independent copies of a database, such as one for each subtest.