Many thanks Thomas,

Just for my interest have you blogged anywhere about pros and cons of
the different isolation levels?

Lucene is great for snapshot isolation but I guess you would have file
descriptor problems pretty quickly.

Cheers

Sam

On Jan 20, 8:12 pm, Thomas Mueller <[email protected]>
wrote:
> 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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