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DataServer for Oracle
Sample Queries : Query 13
 

Query 13

In Query 13 presented in this section, note the following points related to cursor behavior:
<2>   The DataServer uses the cursor to compare schema information and fetch CUSTOMER rows.
<3>   The DataServer uses the cursor to compare schema information. It does not fetch any column values. Note that because the ORDER_ table contains a date, the DataServer does not reuse this cursor to fetch column values.
<4>   The DataServer uses a lookahead cursor to select fields in the field list in addition to those required by the client.
<5>   The lookahead cursor selects fields from the ORDER_ table that correspond to a particular CUSTOMER row (WHERE CUST_NUM = :1).
FOR EACH customer FIELDS (name custnum postalcode) NO-LOCK,
  EACH order FIELDS (orderdate salesrep) OF customer NO-LOCK
    QUERY-TUNING (NO-JOIN-BY-SQLDB):
  DISPLAY customer.name customer.custnum customer.postalcode
    order.orderdate order.salesrep.
END.
OCI call OCIStmtPrepare <2> sqlcrc = 41633
SELECT /*+ INDEX(T0 CUSTOMER##PROGRESS_RECID) */ * FROM DOCTEST.C
USTOMER T0 WHERE PROGRESS_RECID = :rid
OCI call OCIStmtExecute-DescribeOnly <2>
OCI call omru <2>
OCI call OCIStmtPrepare <3> sqlcrc = 60664
SELECT /*+ INDEX(T0 ORDER_##PROGRESS_RECID) */ * FROM DOCTEST.ORD
ER_ T0 WHERE PROGRESS_RECID = :rid
OCI call OCIStmtExecute-DescribeOnly <3>
OCI call omru <3>
OCI call OCIStmtPrepare <4> sqlcrc = 40887
SELECT /*+ INDEX_ASC(T0 CUSTOMER##CUST_NUM) */ PROGRESS_RECID un
ique_id_0,CUST_NUM,NAME,POSTAL_CODE FROM DOCTEST.CUSTOMER T0
OCI call OCIStmtExecute <4>
OCI call OCIStmtPrepare <5> sqlcrc = 17552
SELECT /*+ INDEX_ASC(T0 ORDER_##CUST_ORDER) */ PROGRESS_RECID un
ique_id_0,CUST_NUM,ORDER_DATE,SALES_REP FROM DOCTEST.ORDER_ T0 WH
ERE (CUST_NUM = :1)
OCI call OCIStmtExecute <5>
< repeat for each row >
Cursor <4> Rows processed 85 (last execution)
Number of array fetches 1
Number of rows fetched 85
Number of array rows 105
Number of array columns 4
Number of tables 1
Space for one row 78
Requested cache size 8192
Actual cache size used 8190
OCI call OCIHandleFree <0>
Cursor <5> Rows processed 0 (last execution)
Total Rows processed 207 (previous executions)
Number of array fetches 0
Number of rows fetched 0
Number of array rows 141
Number of array columns 4
Number of tables 1
Space for one row 58
Requested cache size 8192
Actual cache size used 8178