per-thread^per-DBConn writeBuffer

  1. Broadly speaking, if you write to a table in your DB connection but don’t commit, it will be invisible to other connections.
  2. Similarly, if a thread writes to shared object without memory fence, the updates is only in the per-thread buffer and invisible to other threads.
  3. File write is an even more common scenario. One process writes a single line to the file, but doesn’t flush. It will not be visible to other processes.
  4. CVS

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