Oracle Server - Enterprise Edition - Version: 220.127.116.11 Information in this document applies to any platform.
When a bitmap index is created on an ASSM tablespace, using an extent size specified as UNIFORM, with AUTOEXTEND enabled, the index increases to a very large size. If the index is dropped and rebuilt, the size is considerably smaller. The DBMS_SPACE.SPACE_USAGE procedure shows several unformatted blocks for the affected object. The issue doesn't seem to be limited specifically to indexes as other objects show abnormal space allocation as well.
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