Indexing and who should do it

I work for a company that has a fairly large data warehouse Oracle that we use to store the SAP data dissemination (about 500 M of lines for some tables). Tables are not indexed and if I try to reach them on the query takes hours to complete. If the DBA needs to be proactive and create these indexes in order to reduce the load on the database?

The team wants to load our 40 hours for 3 indices Department ADMINISTRATOR has already provided a script for. I'm naïve or y at - it something crazy to need 40 hours to implement 3 clues? I should mention that these tables is related to SAP and should be indexed to joined already IMO.

I'm just trying to understand if I'm missing something.

Thank you

Creation of parallel indexing can reduce your time to create, but you must "alter index noparallel xyz" after its creation if you want really not parallel to this topic.

Another impact on the creation of index how long does is how fast your hardware (processors, processor speed, speed of SAN etc.), but also what else is no running on the database in time using server resources.

On an AIX Power 7-3 processor (quad core) production server it took me about 15 minutes to create an index on a table of 600 million lines running at the same time 8.

On an AIX Power 5-4 Intel (quadruple-heart) test server it took about twice as long.  The SAN on production was super fast as well which had impact on how long it took.

There are other factors that will affect the creation time.

Specifically that I seriously doubt they can justify bill you for 40 hours.  It is unlikely that someone will run a script and then watching the screen for the next 40 hours waiting for the index to create... unless they are a bunch of clowns.  More than likely they run the script, go and do other things and periodically check to see if she has completed.

Your IT team is having a laugh.  It should be fun to ask them to justify and to break the 40 hours.  minute to copy the script on the server, 30 seconds to go, 30 seconds to run the script.  39hrs, of 58 minutes watching the screen ready to create index at the end... Hmm... sounds fishy to me.

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