Green-IT und Datenbanken - ODBMS

Relative Kosten = 116234493
Abfrageplan
Call module D, which populates temp-file D.
Read temp-file D, looping on O_TOTALPRICE, O_ORDERDATE, and a counter.
For each row:
Output the row.
module D
Call module B, which populates bitmap temp-file A.
Call module C, which populates temp-file B.
Read temp-file B, looping on O_TOTALPRICE, O_ORDERDATE, and ID.
For each row:
6.2 Energieeffizienz und Indizes
Read master map SQLUser.CUSTOMER.CUSTORMERPRIMARYIDX, using the given idkey
value.
Read master map SQLUser.LINEITEM.LINEITEMPRIMARYIDX, using the given L_ORDERKEY,
and looping on L_LINENUMBER.
For each row:
Check distinct values for ID and ID using temp-file C,
subscripted by a hashing of these values.
For each distinct row:
Add a row to temp-file D, subscripted by O_TOTALPRICE, O_ORDERDATE, and a
counter,
with node data of ID, C_NAME, ID, L_QUANTITY, the hashing, and [value].
Update the accumulated sum(L_QUANTITY) in temp-file C,
subscripted by the hashing.
module B
Read index map SQLUser.ORDERS.OORDERDATEIDX, looping on O_ORDERDATE and ID.
For each row:
Add ID bit to bitmap temp-file A.
Read bitmap temp-file A, looping on ID.
For each row:
module C
Read master map SQLUser.ORDERS.ORDERSPRIMARYIDX, using the given idkey value.
Add a row to temp-file B, subscripted by O_TOTALPRICE, O_ORDERDATE, and ID,
with node data of O_CUSTKEY.
Call module I, which populates temp-file E.
Read temp-file E, looping on a counter.
For each row:
subquery
Abbildung 6.13: Abfrageplan TPC-H Abfrage 18 mit zusätzlichem Index.
Read temp-file F, using the given subscript values.
Determine subquery result.
module I
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