Hi!
1. Is there a unique key for the query log? The log I am refering to is the *wdqs_extract* table**from the hive database wmf.**We would like to be able to permanently link our own computed data with the log entry we computed it from.
I think you can use hostname+sequence (from https://wikitech.wikimedia.org/wiki/Analytics/Data/Webrequest, assuming those are preserved in wdqs_extract) as a key.
2. Is it possible to find out if a query in a given log entry was accepted by the sparql endpoint as valid?
If it wasn't, the result code should be 400.
3. Is there any other database system besides hive installed on the server?
I think the currently recommended interface is beeline, not sure about other DB systems.
And finally a question on conventions for this mailing list: Am I correct in sending one mail for multiple questions or should I send separate mails for each question?
I think it's ok. For the questions regarding data and other WDQS specifics you may also CC me or discovery@lists.wikimedia.org.