Improve the limbo transactions scan at the end of the sweep
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Key: CORE-3994
URL: http://tracker.firebirdsql.org/browse/CORE-3994
Project: Firebird Core
Issue Type: Improvement
Components: Engine
Affects Versions: 2.5.2, 2.1.5, 2.0.7, 2.5.1, 2.1.4, 2.5.0, 2.0.6, 3.0
Initial, 2.1.3, 2.1.2, 2.0.5, 2.1.1, 2.1.0
Reporter: Dmitry Yemanov
Priority: Minor
After performing a garbage collection pass, the sweep advances the global OIT
number. But it cannot be advanced further than the oldest known in-limbo
transaction. In order to find one, the engine scans all the transactions since
the old OIT. But the used algorithm has a quadratic cost, so it looks like a
server hang if the transaction gap is big enough. See CORE-3908 for the test
details.
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