Online Index Rebuild Tuning

Folks,

I know that when creating indexes a couple of settings such as SORT_AREA_SIZE can have a big impact on duration. What settings apply during online rebuilds? Are the rules the same? What tips do you have?

Basically we have some very large indexes in an OLTP system (several indexes are across ~250m rows, several GB in physical storage) which have fairly low density due to deletes and updates. In looks like the time has come to rebuild then to gain some performance. Any other suggestions regarding tricks to avoid this, etc would be greatly appreciated.

Thanks,

     Mark.

PS: If you going to suggest things which are version specific we're dealing with 8.1.7.4 on Solaris.

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