>>>I just want to confirm following point: Is any TIME difference between opening table as 1)Exclusive; 2)Shared 3)Noupdate. If yes, what is faster?
>>
>>...I worked a lot with LARGE databases - over 100Mg with millions of
>>records. The fastest in a regular SKIPping is NoUpdate. Then goes
>>EXCLUSIVE. Shared is the slowest !!!
>
>Thank you. But one more question. If I open tables using DataEnvironment may I use some property to imitate NOUPDATE clause?

set readonly to .t. in the table properties after you've added it to the DE...