Many organizations that built data warehouses in the past are experiencing significant scalability, performance and integration problems. "Response time to queries is getting slower, reporting functions are inflexible and IS cannot respond rapidly to requests for changes in functionality," Pieter Mimno, an independent consultant told attendees Aug. 13 at The Data Warehousing Institute World Conference – Summer 2001 in Anaheim, Calif. "Many previously built data marts are stove pipes that do not share business rules and conditions. Non- integrated stovepipe data marts cannot be used to support consolidated financial reporting."

Mimno says the top reasons data warehouses encounter problems include:

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