Hi,
What does muti-threading inside database engine mean?
Surely it can't mean that only then more than one connection is allowed
concurrently.
That seems to be the meaning of EXCLUSIVE
So does it mean that more than one processes (jvms) can access the same
database file concurrently?
But that does not seem likely either because how could the engine ensure
consistency of the database file then?
Well it seems to be somehow possible because that is what
FILE_LOCK=SERIALIZED promises.
"This locking mode allows to open multiple connections to the same database.
The connections may be opened from multiple processes and from different
computers.
When writing to the database, access is automatically synchronized
internally."
Maybe the synchronization is done so that only one process has access to
the file but for a short period only
so that it seems like concurrent access.
||
MVCC is said to conflict with MULTI_THREADED=TRUE but that does not
explain what MULTI_THREADED means.
- rami
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