I have a long running query "delete from mytable" which last ~30 seconds
(deleting ~400 000 records).
While this query is running, the database is totally locked, I can't
execute another query.
Well I can execute the query, but it will be executed only after the
"delete" query is done. Even if it is a simple query like "select 1" or
"select 1 from dual"
However if I start a long running query like "select
hash('sha256','aaaa',20000000);" I can execute in parallel "select 1" and
it will return immediatly.
Why the "delete" statement is locking everything ?
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