[h2] Slow Performance of Update / merge into sStatements

2023-07-19 Thread Andrii Odnoviunenko
Hello, 

We face the following  performance   issue of the H2 Database V2 in the 
embedded mode is not good 
 (UPDATE statement for 1 column in a table with 1 Million dataset with a 
unique index column ) takes about 40 seconds

jdbc:h2:file:XX:CACHE_SIZE=600;QUERY_CACHE_SIZE=16;

also "merge into" statements with a join between 2 indexed columns are 
comparably slow. 
In general the performance is times worse than in a test with Oracle 
database

various settings have been tried (increasing cache size helped a bit, but 
not much
I have also tried the "split" mode and changing page size to other values 
(there have ben only marginally small performance gains)

Please advice what the reason can be? Which other settings may cause this 
performance issue?

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[h2] test

2023-07-19 Thread Andrii Odnoviunenko
test

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