Explanation:
The AUTOEXTEND keyword indicates a clause in which you can define whether a datafile extends automatically in support of tablespace growth. DEFAULT STORAGE clause indicates default settings for segments and extents of objects placed unto this tablespace when no storage clause was specified in creating that object. EXTENT MANAGEMENT clause is a clause used for defining whether the tablespace free space allocation will be locally managed or dictionary managed. DATAFILE clause is used when creating tablespaces to identify the name of a datafile to create in support of this tablespace.
Reference:
Oracle 9i: Administrator’s Guide
Oracle 9i: Concepts

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