A common reason is using a partition key with excessive cardinality. On creating a table, users can optionally specify a column as a partition key by which data will be separated. A new file system directory will be created for every key value. This is typically a data management technique, allowing users to cleanly separate data logically in a table. Operations such as DROP PARTITION subsequently allow fast deletion of data subsets. This powerful feature can, however, easily be misused, with users interpreting it as a simple optimization technique for queries.
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Kelvin Sampson will need efficient efforts from star guards Kingston Flemings and Emanuel Sharp. And Joseph Tugler, last season's Big 12 Defensive Player of the Year, has spent the last portion of his campaign as an emerging offensive threat. But to beat the best offense in the country, Houston will have to utilize the same gritty style that has anchored its 7-1 streak in its past eight games. One of the best defensive units in America will have to gain the edge against Illinois, which can turn a trickle of shots into a fire hose. Houston's defensive strengths will have to be the difference against Brad Underwood's squad. -- Medcalf