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DataServer for Oracle
Sample Queries : Query 12
 

Query 12

In Query 12 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 cursor is used to perform the join by the SQLDB. It uses a standard cursor for the join. Each row of the join requires 8 bytes of the cache because the join cursor fetches only the unique integer record identifiers.
<5>   The DataServer uses this cursor to fetch ORDER_ rows by the PROGRESS_RECID column. It cannot use the schema comparison cursor (<39>) because the DataServer must perform a TO_CHAR conversion on the date columns.
FOR EACH customer FIELDS (name custnum postalcode) NO-LOCK,
  EACH order FIELDS (orderdate salesrep) OF customer NO-LOCK
    QUERY-TUNING (NO-LOOKAHEAD):
  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.CUSTOMER 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.ORDER_ T0 WHERE PROGRESS_RECID = :rid
OCI call OCIStmtExecute-DescribeOnly <3>
OCI call omru <3>
OCI call OCIStmtPrepare <4> sqlcrc = 48763
SELECT T0.PROGRESS_RECID unique_id_0,T1.PROGRESS_RECID
unique_id_1 FROM DOCTEST.CUSTOMER T0,DOCTEST.ORDER_ T1
WHERE (T1.CUST_NUM = T0.CUST_NUM)
OCI call OCIStmtExecute <4>
OCI call omru <2>
OCI call OCIStmtExecute <2>
OCI call OCIStmtPrepare <5> sqlcrc = 18715
SELECT /*+ INDEX(T0 ORDER_##PROGRESS_RECID) */ ORDER_NUM,CUST_NUM
,TO_CHAR(ORDER_DATE,'YYYYMMDDHH24MISS'),TO_CHAR(SHIP_DATE,'YYYYMM
DDHH24MISS'),TO_CHAR(PROMISE_DATE,'YYYYMMDDHH24MISS'),CARRIER,INS
TRUCTIONS,PO,TERMS,SALES_REP,PROGRESS_RECID FROM DOCTEST.ORDER_
T0 WHERE PROGRESS_RECID = :rid
OCI call omru <5>
OCI call OCIStmtExecute <5>
OCI call omru <2>
OCI call OCIStmtExecute <2>
< repeat, alternating handles 5 and 2 >
Cursor <4> Rows processed 207 (last execution)
Number of array fetches 2
Number of rows fetched 207
Number of array rows 128
Number of array columns 2
Number of tables 2
Space for one row 8
Requested cache size 1024
Actual cache size used 1024
OCI call OCIHandleFree <0>
Cursor <5> Rows processed 1 (last execution)
Total Rows processed 206 (previous executions)
OCI call OCIHandleFree <0>
Cursor <2> Rows processed 1 (last execution)
Total Rows processed 203 (previous executions)
OCI call OCIHandleFree <0>
Cursor <3> Rows processed 0 (last execution)