Hi Hasitha, In a durable topic scenario, for each message received from the publisher, we generate a number of messages that is equal to the number of durable subscriptions (with different message IDs). Therefore, we have each content entry associated to a unique metadata entry. So I think cascade delete will not be a problem.
Thank you On Tue, Jul 7, 2015 at 3:15 PM, Hasitha Amal De Silva <hasit...@wso2.com> wrote: > Hi guys, > > In a durable topic scenario, say we have 2 subscribers A and B, do we > maintain 2 entries for the same message content @ message_content table ? > If we refer to the same message_content entry for both subscribers, be wary > of cascade deletes. > > Thanks > > On Fri, Jun 26, 2015 at 3:06 PM, Anuja Herath <an...@wso2.com> wrote: > >> Hi Sasikala, >> >> Since we dropped cassandra, this will enable us to use full power of >> RDBMS. >> But make sure that mentioned operations will work on MySQL, MS SQL and >> oracle in the same way. >> >> Thanks, >> Anuja >> >> On Fri, Jun 26, 2015 at 2:56 PM, Sasikala Kottegoda <sasik...@wso2.com> >> wrote: >> >>> Hi all, >>> >>> Currently our database schema does not support referential integrity >>> between the tables MB_CONTENT (which stores message contet) and MB_METADATA >>> (which store message metadata). But message content with no related >>> metadata is meaningless. >>> >>> To address this problem, what we have done is deleting message content >>> along with metadata. >>> >>> But if we have have a foreign key relationship between the two tables, >>> we will be able to ensure that no message content will be left without >>> metadata associated. Also, it will reduce the number of database calls that >>> are made thus speeding up the process. >>> >>> Any comments? >>> >>> Thank you. >>> -- >>> Sasikala Kottegoda >>> *Software Engineer* >>> WSO2 Inc., http://wso2.com/ >>> lean. enterprise. middleware >>> Mobile: +94 774835928/712792401 >>> >>> _______________________________________________ >>> Dev mailing list >>> Dev@wso2.org >>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>> >>> >> >> >> -- >> Anuja Herath >> *Software Engineer* >> *WSO2, Inc.* >> Mobile : +94 (0)71 429 8861 >> >> _______________________________________________ >> Dev mailing list >> Dev@wso2.org >> http://wso2.org/cgi-bin/mailman/listinfo/dev >> >> > > > -- > Cheers, > > Hasitha Amal De Silva > Software Engineer > Mobile : 0772037426 > Blog : http://devnutshell.tumblr.com/ > WSO2 Inc.: http://wso2.com ( lean.enterprise.middleware. ) > -- Sasikala Kottegoda *Software Engineer* WSO2 Inc., http://wso2.com/ lean. enterprise. middleware Mobile: +94 774835928/712792401
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