Thanks for the response. Here is the nice blog why there would be blockings.

http://www.sqlskills.com/blogs/paul/a-sql-server-dba-myth-a-day-830-unicorns-rainbows-and-online-index-operations/

But there are other precautions that we could take to reduce the blocking.

yes there is an update trigger on this table and there is enough space so, I don't think that is causing the issue.

We are trying to create index on a huge table, we expect it to run for around 1hr (as we tried in a replica copy with same data), but we...

Its working, thanks

Thanks for the reply, but In this code we are not specifying any file path, where does the .dat file falling into. any default location or do we need to...

yes, you were right, they are set options while creating/altering each Indices, I could see few are persisted and others are not (EX: ONLINE, SORT_IN_TEMPDB, STATISTICS_INCREMENTAL, MAXDOP). They are just...

These are the index options

IGNORE_DUP_KEY

STATISTICS_NORECOMPUTE

DROP_EXISTING

ONLINE

DATA_COMPRESSION