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SQL transaction isolation level

| nosplit | ↑ parent "SQL transaction" | words: 82 | descendant words: 2k | descendants: 10
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Each transaction isolation level specifies what can or cannot happen when two queries are being run in parallel, i.e.: the memory semantics of the system.
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Remember that queries can affects thousands of rows, and database systems like PostgreSQL can run multiple such queries at the same time.
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Implementation specifics:
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