in mssql, for the options to reorg or rebuild the indexes :
1. does reorg or rebuild index require extra free space to the tune of 120% of the size of the table, in the database?
2. does reorg only use the above free space for sorting, but finally uses the old index pages for the index itself.
3. does rebuild, build the index on the new pages from the free space?
4. during reorg or rebuild of the index, will the table be accessible?
and what about table fragmentation? how to defrag a table in mssql?
appreciate the feedback.