Hi,

> Would I be right in thinking that Lucene/FTL index does not honour
> MVCC session isolation?

Yes, the fulltext search is updated as soon as the changes occur
(before they are committed).

> Also that H2 does not support MVCC Snapshot isolation?

The MVCC implementation of H2 doesn't completely match other MVCC
implementations. H2 doesn't support snapshot isolation, but read
committed instead. This has advantages (I think the implementation is
simpler and faster) and disadvantages (it's not fully compatible with
PostgreSQL and Oracle). Please note that snapshot isolation is also
problematic for certain use cases.

Regards,
Thomas

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