Github user franz1981 commented on the issue:

    https://github.com/apache/activemq-artemis/pull/1997
  
    @nlippke @mtaylor I have updated this PR to avoid issues with concurrent 
creations of tables/indexes for the JDBC Journal with Oracle (there is a test 
attached): when a table seems to exists both CREATE TABLE and CREATE INDEX 
statements are no longer used to initialize it.
    That is useful to allow a shared store to concurrently start 2 journals on 
the same database and while rebooting the broker with an empty journal (table 
already existent, but empty ie no need to create index twice).
    That means that a DBA should take care to create table and indexes (if 
any), but if it will just create tables, the broker won't create any index on 
them, wdyt?


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