Transaction isolation levels.

For more information about isolation levels, consult the ITTIA DB User's Guide.

See also:
Database::tx_begin, Database::set_default_isolation_level, Database::get_default_isolation_level
Enumerator:
DB_DEFAULT_ISOLATION  Use storage settings to determine isolation level.

See also:
Database::get_default_isolation_level, Database::set_default_isolation_level
DB_READ_COMMITTED  Read committed isolation.
DB_REPEATABLE_READ  Repeatable-read isolation.
DB_SERIALIZABLE  Serializable isolation.


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