Monday Feb 03, 2014

Memory Guard

Happy New ... err .. Chinese Year! Yeah, its been a while, its also been danged busy and we're only in February, just! A question came up on one of our internal mailing lists concerning out of memory errors. Pieter, support guru extraordinaire jumped on it with reference to a support note covering the relatively new 'BI Publisher Memory Guard'. Sounds grand eh?

As many a BIP user knows, at BIP's heart lives an XSLT engine. XSLT engines are notoriously memory hungry. Oracle's wee beastie has come a long way in terms of taming its appetite for bits and bytes since we started using it. BIP allows you to take advantage of this 'scalable mode.' Its a check box on the data model which essentially says 'XSLT engine, stop stuffing your face with memory doughnuts and get on with the salad and chicken train for this job' i.e. it gets a limited memory stack within which to work and makes use of disk, if needed, think Windows' 'virtual memory'.

Now that switch is all well and good, for a known big report that you would typically mark as 'schedule only.' You do not want users sitting in front of their screen waiting for a 10,000 page document to appear, right? How about those reports that are borderline 'big' or you have a potentially big report but expect users to filter the heck out of it and they choose not to? It would be nice to be able to set some limits on reports in case a user kicks off a monster donut binge session. Enter 'BI Publisher Memory Guard'!

It essentially lets you set those limits on memory and report size so that users can not run a report that brings the server to its knees. More information on the support web site, search for 'BI Publisher Memory Guard a New Feature to Prevent out-of-memory Errors (Doc ID 1599935.1)' or you can get Leslie's white paper covering the same here.

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