topic Re: inconsistent loading in QlikView from SQL database in QlikView

inconsistent loading in QlikView from SQL database

rcorcoran — Sat, 23 Mar 2019 12:31:03 GMT

I have a dashboard that is in use for the last 4 years. It is in QV 11.2 and connects to a view in a SQL database. It has been very reliable and stable but just in the last few weeks it has been returning inconsistent data in that the numbers of rows it loads each time is changing even though the records havent changed in the database. It is causing data to appear and disappear per load and seems to be only affecting some data sets though its effects seem to be growing.

Any help would be appreciated.

FACTS << MMI_ScorecardLevel3 2,570,976 lines fetched at 9.26am
FACTS << MMI_ScorecardLevel3 2,505,834 lines fetched at 9.44 am

no change to database in between. it is a OLE DB connection

Re: inconsistent loading in QlikView from SQL database

Gysbert_Wassenaar — Sat, 23 Mar 2019 14:46:10 GMT

Are there any other processes executing queries on that database and perhaps locking records while doing so?

Re: inconsistent loading in QlikView from SQL database

rcorcoran — Sat, 23 Mar 2019 15:17:48 GMT

Hi there would be other queries from other dashboards not at the same time but would this lock records and if so how do we unlock them?
I did read on google about blocking but not sure if this is a thing?
Any help appreciated

Re: inconsistent loading in QlikView from SQL database

Gysbert_Wassenaar — Mon, 25 Mar 2019 13:24:13 GMT

depends on your dbms. read the parts about isolation levels:
ms sql server: https://docs.microsoft.com/en-us/sql/relational-databases/sql-server-transaction-locking-and-row-versioning-guide?view=sql-server-2017
oracle: https://docs.oracle.com/cd/B19306_01/server.102/b14220/consist.htm