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This web page dbathoughts.blogspot.com states the following, "This blog is to share my Oracle experiences and learnings." We saw that the webpage said " Its also to rumble about my feelings on various oracle related stuff." It also said " Tuesday, August 30, 2011. Invisible Indexes in Oracle 11g. Always wanted this the ability to create an index on production without impacting the queries being fired by application but at the same time test the impact an index creation can cause. Invisible indexes are useful alternative to making an index unusable or to drop it." The header had Oracle Database as the highest ranking optimized keyword. It is followed by Oracle New Features, Oracle 11g, and Oracle 10g which isn't as ranked as highly as Oracle Database. The next words dbathoughts.blogspot.com used was Oracle DBA. Oracle RAC was included but will not be viewed by search engines.