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how to use sequence and what use of sequence cache

how to use sequence and what use of sequence cache..

Answer / pravin

sequence is sharable object in database which is use to
generate unique number
use of sequence is like
insert into table(emp_id,name)values
cache is the memory use to how manu values preallocates in
memory & keep in memory defined in cache.
by default 20 values can be stored in cache.

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