Hi,

> Is shared lock on a table is hold for the duration
> of all selects in UNION?

Yes.

> BTW, is there easy way to see the locks behavior, by enabling some
> logging etc (so that I wouldn't ask such stupid questions anymore :)?

Yes, set the trace level to 3 and then filter (grep) the .trace.db
file for " lock:". Example:

12-28 11:40:07 lock: 2 exclusive write lock requesting for TEST
12-28 11:40:07 lock: 2 exclusive write lock added for TEST

See also: http://h2database.com/html/features.html#trace_options

Regards,
Thomas

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