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DataServer for Oracle
Sample Queries : Query 10
 

Query 10

In Query 10 presented in this section, note the following points related to cursor behavior:
<2>   The DataServer uses the cursor to compare schema information. It does not fetch any column values.
<3>   The DataServer uses the cursor to compare schema information. It does not fetch any column values.
<4>   The cursor is used to perform the join by the SQLDB. Since the query specifies NO-LOCK, this cursor selects the fields in the field list in addition to those that the client requires (T0.PROGRESS_RECID, T1.PROGRESS_RECID, T1.CUST_NUM). With the default cache size of 8192, processing the entire join requires 3 array fetches.
FOR EACH customer FIELDS (name custnum postalcode) NO-LOCK,
  EACH order FIELDS (orderdate salesrep) OF customer NO-LOCK:
  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 OCIHandleAlloc <0>
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 OCIHandleAlloc <0>
OCI call OCIStmtPrepare <4> sqlcrc = 51753
SELECT T0.PROGRESS_RECID unique_id_0,T0.CUST_NUM,T0.NAME,T0.POSTA
L_CODE,T1.PROGRESS_RECID unique_id_1,T1.ORDER_DATE,T1.SALES_REP F
ROM DOCTEST.CUSTOMER T0,DOCTEST.ORDER_ T1 WHERE (T1.CUST_NUM = T0
.CUST_NUM)
OCI call OCIStmtExecute <4>
OCI call OCIStmtFetch <4>
OCI call OCIStmtFetch <4>
OCI call omru <4>
Cursor <4> Rows processed 207 (last execution)
Number of array fetches 3
Number of rows fetched 207
Number of array rows 87
Number of array columns 7
Number of tables 2
Space for one row 94
Requested cache size 8192
Actual cache size used 8178
OCI call OCIHandleFree <0>
Cursor <3> Rows processed 0 (last execution)
OCI call OCIHandleFree <0>
Cursor <2> Rows processed 0 (last execution)
OCI call OCIHandleFree <0>