SQL Index question

There is a SQL Index on our system in our Production library. It has a
Last Used Date of today [it seems to be used every day].

There is no source for its creation in our normal places, so it appears to
have been created on the fly in a SQL window [not a problem].

My question is how to find out what is causing the Last Used Date to be
updated. I have searched all source program files and nothing is
referencing it, so I feel comfortable saying that it's not an RPG nor CL
program. I am under the impression that any other language on the system
[i.e. Java, PHP, etc] can only access DB2 using SQL [as opposed to using
Native methods]. Using SQL to access columns in this index is not
permitted [gives SQLSTATE 42851]. Any way for me to find out what is using
it or causing the Last Used Date to be updated?

When I look at SYSINDEXSTAT, I see that the LAST_QUERY_USE field and
LAST_STATISTICS_USE field is also today. Is it correct to assume that if
either of these fields get updated, then the Last Used Date field gets
updated too?

Thank you,

Doug



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