| 摘要 |
A facility for storing extrinsic data is described. The facility receives data associated with a distinguished extrinsic data item of a specified type. The facility determines whether a flexible column directory table contains an entry mapping the distinguished extrinsic data item to a flexible column pool column. If the flexible column directory table does not contain an entry mapping the distinguished extrinsic data item to a flexible column pool column, the facility creates an entry in the flexible column directory table that maps the distinguished extrinsic data item to an available flexible column pool column of the specified type. The facility then copies the received data to the flexible column pool column mapped from the distinguished extrinsic data item.
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