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04/25/2005

Yan Huang - CSCI5330 Database Implementation – Parallel Database

Skew

The distribution of tuples to disks may be skewed

Attribute-value skew.

Some values appear in the partitioning attributes of many tuples

Partition skew.

Too many tuples to some partitions and too few to others

Round robin handles skew well

Hashing and ranging may result in skew

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