... the block move under the disk head as the entire
disk assembly rotates.
The time taken between the moment at which the command to read a block
is issued and the time that the contents of the ... latency: the time for the disk to rotate so the first of the sectors
containing the block reaches the head.
X
typical disk rotates completely
about once every 10 mi...
... room for the inserted record in
the
block at hand, then we
simply slide the records within the block and adjust the pointers in the offset
table. The new record is inserted into the block, ... having to retrieve the
block containing the record. The fact that
K
exists in the dense index is enough
to guarantee the existence of the record
with key
I(.
On th...
... shows the complete translation to
relational algebra.
.&bola the
y,
the
StarsIn
from the outer query is joined n-ith
the result of the subquery. The selection from the subquery is then ...
16.4.4) to the twvo relations that are the join of
the R's and the join of the S's, the estimate
will be the product of the
two estimates, divided by...
... instance, if the document has
1000 word occurrences, two of which
are " ;database. " then the doculllent ~vould be placed at the ,002 coordinate in
the dimension
cor~esponding to " ;database. " ... unoccupied.
then the "border" represents only a small addition to the volume of the cube
(i.e., the number of tuples in the fact table).
In
that...
... instance, if the document has
1000 word occurrences, two of which
are " ;database. " then the doculllent ~vould be placed at the ,002 coordinate in
the dimension
cor~esponding to " ;database. " ... the data cube,
the vie~vs we n-ould choose to materialize xi11 typically be aggregations of the
full data cube.
The coarser the partition implied by the gr...
... happens if there is a failure after line (14); perhaps the
computer fails or the network connecting the database to the processor that
is actually performing the transfer fails. Then the database ... seat and books it. The other customer's in-
vocation then begins and sees that the seat is already occupied. It may matter
to the customers
who gets the seat, bu...