When Do Global And Local Indexes Becoming UNUSABLE?

Nov 29, 2012

RDMS Version : 11.2.0.2
Platfomrm : AIX 6.1

For partitioned tables (RANGE, LIST types ) what are circumstances when a Global or a Local Index become UNUSABLE ? I was told that in some circumstances where the Indexes become UNUSABLE , not even a SELECT query against the table will work. Is this true ? For partitioned tables with Global Index, the global index will be listed in DBA_INDEXES . Right ?

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(per http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1401247200346349807)
=================================================================
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Version Info: 11.2 on Solaris 10

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begin
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[code]...

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16:28:32 SQL> create bitmap index bp_idx_ag_id on transactions(type);

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*
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------------------------
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[code]....

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*
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