Green-IT und Datenbanken - ODBMS

6 Energieoptimierungen
Relative Kosten = 3010269
Abfrageplan
Call module D, which populates temp-file D.
Read temp-file D, looping on %SQLUPPER(L_SHIPMODE) and a counter.
For each row:
Output the row.
module D
Call module B, which populates temp-file A.
Call module C, which populates temp-file B.
Read temp-file B, looping on %SQLUPPER(L_SHIPMODE) and ID.
For each row:
Read master map SQLUser.ORDERS.ORDERSPRIMARYIDX, using the given idkey value.
Check distinct values for %SQLUPPER(L_SHIPMODE) using temp-file C,
subscripted by a hashing of these values.
For each distinct row:
Add a row to temp-file D, subscripted by %SQLUPPER(L_SHIPMODE) and a counter,
with node data of %SQLUPPER(O_ORDERPRIORITY), the hashing, and [value].
Update the accumulated sum([expression]) in temp-file C,
subscripted by the hashing.
Update the accumulated sum([expression]) in temp-file C,
subscripted by the hashing.
module B
Read index map SQLUser.LINEITEM.LRECIEPTDATEIDX, looping on L_RECEIPTDATE (with a
range condition), L_ORDERKEY, and L_LINENUMBER.
For each row:
Add a row to temp-file A, subscripted by ID,
with no node data.
Read temp-file A, looping on ID.
For each row:
module C
Read master map SQLUser.LINEITEM.LINEITEMPRIMARYIDX, using the given idkey value.
Add a row to temp-file B, subscripted by %SQLUPPER(L_SHIPMODE) and ID,
with node data of L_ORDERKEY.
Abbildung 6.2: Abfrageplan Abfrage 12 mit zusätzlichem Index auf Spalte
lreceiptdate.
92