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size difference in identical composite indexes

edited Apr 4, 2012 8:04AM in Database Administration (MOSC) 1 commentAnswered
Ran across this situation.  For now I'm looking past the fact that we have two identical unique indexes on the same table (I'll be looking into that).  I'm primarily interested in understanding

the difference between the two indexes.  

----  Facts ----

Oracle 10.2.0.5

Index tablespace block size 8K  (both indexes built with identical storage parameters)

Table is approximately 800M  (freshly imported and indexes freshly built)

Index one: (DIST_NBR, SIZE_NBR, STORE, REC_NBR)   compress 3  size is 768M 

Index two: (REC_NBR, DIST_NBR, SIZE_NBR, STORE)   compress 3  size is 323M

Rebuild index one as uncompressed and it is considerablly smaller (596M)

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