{c}

= SQL isolation level
{synonym}

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.

Remember that queries can affects thousands of rows, and database systems like <PostgreSQL> can run multiple such queries at the same time.

Good summary on the <PostgreSQL> page: https://www.postgresql.org/docs/14/transaction-iso.html

Implementation specifics:
* <SQLite isolation levels>


 SQL transaction isolation level