Hello.

 I have several tables with >100,000 rows and about 10 columns (H2 1.4.197, 
> database about 5GB). If I want to update one column for a large number of 
> rows
>

A regression in 1.4.197 with MVStore mode was found and fixed. It appears 
in large updates in presence of unique constraints or indexes in some 
situations. You can try to build H2 from the current sources to test the 
difference.
 https://github.com/h2database/h2database

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