In passing the huge parameter to oracle procedure have a performance hit?
I have a script attached, in which I am trying process/XML parsing in a table (STAGE_TBL) in the XMLTYPE column and insert the data analyzed in another table (PROCESSED_DATA_TBL). The XML file can be huge up to 2MB, which translates into approximately 2000 + lines of analyzed data. The issue I see is when I pass an XML object to a procedure (STAGE_TBL_PROCESS) to analyze its takes about 10 seconds per XML, but rather than from XML if I directly pick up table in the procedure (STAGE_TBL_PROCESS) passing the ID to be about 0.15 seconds. According to the document while params are passed by reference, so why is this variation of performance?
Details of database Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64-bit version of PL/SQL Production 11.2.0.3.0 - Production "CORE 11.2.0.3.0 Production" TNS for Linux: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production
Note: I could not perform SQL_TRACE or DBMS_STATS as I don't have access to them.
/*
This one is taking .15 seconds to process an XML with about 2000 rp_sendRow elements
*/
DECLARE
CURSOR NewStage IS
SELECT *
FROM STAGE_TBL
WHERE status = 'N'
ORDER BY PUT_TIME ASC;
SUBTYPE rt_NewStage IS NewStage % rowtype;
ROW_COUNT INTEGER := 0; -- Return value from calling the procedure
READ_COUNT INTEGER := 0; -- Number of rows read from the stage table
INSERT_COUNT_TOTAL INTEGER := 0; -- Number of Inserts Inven records
ERROR_COUNT INTEGER := 0; -- Number of Inven inserts that did inserted more then 1 row in Inven
PROCESS_STATUS STATUS.MmsStatus;
STATUS_DESCRIPTION STATUS.MmsStatusReason;
ERRMSG VARCHAR2(500);
PROCEDURE STAGE_TBL_PROCESS (IDDATA IN RAW, PROCESS_STATUS OUT VARCHAR2, STATUS_DESCRIPTION OUT VARCHAR2, ROW_COUNT OUT NUMBER) AS
/*
This procedure is to parse the XML from STAGE_TBL and populate the data from XML to PROCESSED_DATA_TBL table
IN PARAMS
----------
IDDATA - ID from STAGE_TBL
xData - XMLType field from XML_DOCUMENT of STAGE_TBL
OUT PARAMS
-----------
PROCESS_STATUS - The STATUS of parsing and populating PROCESSED_DATA_TBL
STATUS_DESCRIPTION - The description of the STATUS of parsing and populating PROCESSED_DATA_TBL
ROW_COUNT - Number of rows inserted into PROCESSED_DATA_TBL
*/
BEGIN
INSERT ALL INTO PROCESSED_DATA_TBL
(PD_ID,
STORE,
SALES_NBR,
UNIT_COST,
ST_FLAG,
ST_DATE,
ST,
START_QTY,
START_VALUE,
START_ON_ORDER,
HAND,
ORDERED,
COMMITED,
SALES,
RECEIVE,
VALUED,
ID_1,
ID_2,
ID_3,
UNIT_PRICE,
EFFECTIVE_DATE,
STATUS,
STATUS_DATE,
STATUS_REASON)
VALUES (IDDATA
,store
,SalesNo
,UnitCost
,StWac
,StDt
,St
,StartQty
,StartValue
,StartOnOrder
,Hand
,Ordered
,COMMITED
,Sales
,Rec
,Valued
,Id1
,Id2
,Id3
,UnitPrice
,to_Date(EffectiveDate||' '||EffectiveTime, 'YYYY-MM-DD HH24:MI:SS')
,'N'
,SYSDATE
,'XML PROCESS INSERT')
WITH T AS
( SELECT STG.XML_DOCUMENT FROM STAGE_TBL STG WHERE STG.ID = IDDATA)
-- This is to parse and fetch the data from XML
SELECT E.* FROM T, XMLTABLE('rp_send/rp_sendRow' PASSING T.XML_DOCUMENT COLUMNS
store VARCHAR(20) PATH 'store'
,SalesNo VARCHAR(20) PATH 'sales'
,UnitCost NUMBER PATH 'cost'
,StWac VARCHAR(20) PATH 'flag'
,StDt DATE PATH 'st-dt'
,St NUMBER PATH 'st'
,StartQty NUMBER PATH 'qty'
,StartValue NUMBER PATH 'value'
,StartOnOrder NUMBER PATH 'start-on-order'
,Hand NUMBER PATH 'hand'
,Ordered NUMBER PATH 'order'
,Commited NUMBER PATH 'commit'
,Sales NUMBER PATH 'sales'
,Rec NUMBER PATH 'rec'
,Valued NUMBER PATH 'val'
,Id1 VARCHAR(30) PATH 'id-1'
,Id2 VARCHAR(30) PATH 'id-2'
,Id3 VARCHAR(30) PATH 'id-3'
,UnitPrice NUMBER PATH 'unit-pr'
,EffectiveDate VARCHAR(30) PATH 'eff-dt'
,EffectiveTime VARCHAR(30) PATH 'eff-tm'
) E;
ROW_COUNT := SQL%ROWCOUNT; -- Not the # of all the rows inserted.
PROCESS_STATUS := STATUS.PROCESSED;
IF ROW_COUNT < 1 THEN -- The insert failed Row Count = 0 No exception thrown
PROCESS_STATUS := STATUS.ERROR;
STATUS_DESCRIPTION := 'ERROR Did not insert into Pos Inventory. Reason Unknown';
END IF;
EXCEPTION
WHEN OTHERS THEN
ROW_COUNT := 0;
PROCESS_STATUS := STATUS.ERROR;
STATUS_DESCRIPTION := 'SqlCode:' || SQLCODE || ' SqlErrMsg:' || SQLERRM;
END;
BEGIN
DBMS_OUTPUT.enable(NULL);
FOR A_NewStage IN NewStage
LOOP
READ_COUNT := READ_COUNT + 1;
STAGE_TBL_PROCESS(A_NewStage.ID, PROCESS_STATUS, STATUS_DESCRIPTION, ROW_COUNT);
INSERT_COUNT_TOTAL := INSERT_COUNT_TOTAL + ROW_COUNT;
IF(ROW_COUNT <= 0 OR PROCESS_STATUS = STATUS.ERROR) THEN
ERROR_COUNT := ERROR_COUNT + 1;
UPDATE STAGE_TBL
SET status = PROCESS_STATUS,
status_DATE = SYSDATE,
status_DESCRIPTION = STATUS_DESCRIPTION
WHERE ID = A_NewStage.ID;
ELSE
UPDATE STAGE_TBL
SET status = PROCESS_STATUS,
status_DATE = SYSDATE,
status_DESCRIPTION = STATUS_DESCRIPTION,
SHRED_DT = SYSDATE
WHERE ID = A_NewStage.ID;
END IF;
COMMIT;
END LOOP;
COMMIT;
IF ERROR_COUNT > 0 THEN
ERRMSG := '** ERROR: ' || ERROR_COUNT || ' Stage records did not insert in to the Processed table correctly';
RAISE_APPLICATION_ERROR(-20001,ErrMsg);
END IF;
EXCEPTION
WHEN OTHERS THEN
RAISE;
END ;
/*
This one is taking 10 seconds to process an XML with about 2000 rp_sendRow elements
*/
DECLARE
CURSOR NewStage IS
SELECT *
FROM STAGE_TBL
WHERE status = 'N'
ORDER BY PUT_TIME ASC;
SUBTYPE rt_NewStage IS NewStage % rowtype;
ROW_COUNT INTEGER := 0; -- Return value from calling the procedure
READ_COUNT INTEGER := 0; -- Number of rows read from the stage table
INSERT_COUNT_TOTAL INTEGER := 0; -- Number of Inserts Inven records
ERROR_COUNT INTEGER := 0; -- Number of Inven inserts that did inserted more then 1 row in Inven
PROCESS_STATUS STATUS.MmsStatus;
STATUS_DESCRIPTION STATUS.MmsStatusReason;
ERRMSG VARCHAR2(500);
PROCEDURE STAGE_TBL_PROCESS (IDDATA IN RAW, xData IN STAGE_TBL.XML_DOCUMENT%TYPE, PROCESS_STATUS OUT VARCHAR2, STATUS_DESCRIPTION OUT VARCHAR2, ROW_COUNT OUT NUMBER) AS
/*
This procedure is to parse the XML from STAGE_TBL and populate the data from XML to PROCESSED_DATA_TBL table
IN PARAMS
----------
IDDATA - ID from STAGE_TBL
xData - XMLType field from XML_DOCUMENT of STAGE_TBL
OUT PARAMS
-----------
PROCESS_STATUS - The STATUS of parsing and populating PROCESSED_DATA_TBL
STATUS_DESCRIPTION - The description of the STATUS of parsing and populating PROCESSED_DATA_TBL
ROW_COUNT - Number of rows inserted into PROCESSED_DATA_TBL
*/
BEGIN
INSERT ALL INTO PROCESSED_DATA_TBL
(PD_ID,
STORE,
SALES_NBR,
UNIT_COST,
ST_FLAG,
ST_DATE,
ST,
START_QTY,
START_VALUE,
START_ON_ORDER,
HAND,
ORDERED,
COMMITED,
SALES,
RECEIVE,
VALUED,
ID_1,
ID_2,
ID_3,
UNIT_PRICE,
EFFECTIVE_DATE,
STATUS,
STATUS_DATE,
STATUS_REASON)
VALUES (IDDATA
,store
,SalesNo
,UnitCost
,StWac
,StDt
,St
,StartQty
,StartValue
,StartOnOrder
,Hand
,Ordered
,COMMITED
,Sales
,Rec
,Valued
,Id1
,Id2
,Id3
,UnitPrice
,to_Date(EffectiveDate||' '||EffectiveTime, 'YYYY-MM-DD HH24:MI:SS')
,'N'
,SYSDATE
,'XML PROCESS INSERT')
-- This is to parse and fetch the data from XML
SELECT E.* FROM XMLTABLE('rp_send/rp_sendRow' PASSING xDATA COLUMNS
store VARCHAR(20) PATH 'store'
,SalesNo VARCHAR(20) PATH 'sales'
,UnitCost NUMBER PATH 'cost'
,StWac VARCHAR(20) PATH 'flag'
,StDt DATE PATH 'st-dt'
,St NUMBER PATH 'st'
,StartQty NUMBER PATH 'qty'
,StartValue NUMBER PATH 'value'
,StartOnOrder NUMBER PATH 'start-on-order'
,Hand NUMBER PATH 'hand'
,Ordered NUMBER PATH 'order'
,Commited NUMBER PATH 'commit'
,Sales NUMBER PATH 'sales'
,Rec NUMBER PATH 'rec'
,Valued NUMBER PATH 'val'
,Id1 VARCHAR(30) PATH 'id-1'
,Id2 VARCHAR(30) PATH 'id-2'
,Id3 VARCHAR(30) PATH 'id-3'
,UnitPrice NUMBER PATH 'unit-pr'
,EffectiveDate VARCHAR(30) PATH 'eff-dt'
,EffectiveTime VARCHAR(30) PATH 'eff-tm'
) E;
ROW_COUNT := SQL%ROWCOUNT; -- Not the # of all the rows inserted.
PROCESS_STATUS := STATUS.PROCESSED;
IF ROW_COUNT < 1 THEN -- The insert failed Row Count = 0 No exception thrown
PROCESS_STATUS := STATUS.ERROR;
STATUS_DESCRIPTION := 'ERROR Did not insert into Pos Inventory. Reason Unknown';
END IF;
EXCEPTION
WHEN OTHERS THEN
ROW_COUNT := 0;
PROCESS_STATUS := STATUS.ERROR;
STATUS_DESCRIPTION := 'SqlCode:' || SQLCODE || ' SqlErrMsg:' || SQLERRM;
END;
BEGIN
DBMS_OUTPUT.enable(NULL);
FOR A_NewStage IN NewStage
LOOP
READ_COUNT := READ_COUNT + 1;
STAGE_TBL_PROCESS(A_NewStage.ID, A_NewStage.XML_DOCUMENT, PROCESS_STATUS, STATUS_DESCRIPTION, ROW_COUNT);
INSERT_COUNT_TOTAL := INSERT_COUNT_TOTAL + ROW_COUNT;
IF(ROW_COUNT <= 0 OR PROCESS_STATUS = STATUS.ERROR) THEN
ERROR_COUNT := ERROR_COUNT + 1;
UPDATE STAGE_TBL
SET status = PROCESS_STATUS,
status_DATE = SYSDATE,
status_DESCRIPTION = STATUS_DESCRIPTION
WHERE ID = A_NewStage.ID;
ELSE
UPDATE STAGE_TBL
SET status = PROCESS_STATUS,
status_DATE = SYSDATE,
status_DESCRIPTION = STATUS_DESCRIPTION,
SHRED_DT = SYSDATE
WHERE ID = A_NewStage.ID;
END IF;
COMMIT;
END LOOP;
COMMIT;
IF ERROR_COUNT > 0 THEN
ERRMSG := '** ERROR: ' || ERROR_COUNT || ' Stage records did not insert in to the Processed table correctly';
RAISE_APPLICATION_ERROR(-20001,ErrMsg);
END IF;
EXCEPTION
WHEN OTHERS THEN
RAISE;
END ;
My XML with just one rp_sendRow element, it can go upto 2000 rp_sendRow elements
<?xml version = \"1.0\" encoding = \"UTF-8\"?>
<rp_send xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">
<rp_sendRow>
<store>0123</store>
<sales>022399190</sales>
<cost>0.01</cost>
<flag>true</flag>
<st-dt>2013-04-19</st-dt>
<st>146.51</st>
<qty>13.0</qty>
<value>0.0</value>
<start-on-order>0.0</start-on-order>
<hand>0.0</hand>
<order>0.0</order>
<commit>0.0</commit>
<sales>0.0</sales>
<rec>0.0</rec>
<val>0.0</val>
<id-1/>
<id-2/>
<id-3/>
<unit-pr>13.0</unit-pr>
<eff-dt>2015-06-16</eff-dt>
<eff-tm>09:12:21</eff-tm>
</rp_sendRow>
</rp_send>
The issue I see is when I pass an XML object to a procedure (STAGE_TBL_PROCESS) to analyze its takes about 10 seconds per XML, but rather than from XML if I directly pick up table in the procedure (STAGE_TBL_PROCESS) passing the ID to be about 0.15 seconds.
In version 11.1, Oracle introduced a new model of storage for the data type XMLType called XML binary.
Binary XML become the default in 11.2.0.2, to disparage the old storage based on CLOB.
Binary XML is a format optimized after analysis for the storage and treatment of the XQuery.
When an XQuery expression is evaluated (through for example XMLTABLE) on an XMLType column stored as binary XML, Oracle can use an ongoing evaluation of XPath that surpasses the query even crushed a transitional XMLType of several order of magnitude.
You can see that in the action plan of the explain command:
SQL> SELECT E.* 2 FROM stage_tbl t 3 , XMLTABLE('rp_send/rp_sendRow' PASSING t.xml_document 4 COLUMNS store VARCHAR(20) PATH 'store' 5 , SalesNo VARCHAR(20) PATH 'sales' 6 , UnitCost NUMBER PATH 'cost' 7 ) E ; Execution Plan ---------------------------------------------------------- Plan hash value: 1134903869 -------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2008 | 32 (0)| 00:00:01 | | 1 | NESTED LOOPS | | 1 | 2008 | 32 (0)| 00:00:01 | | 2 | TABLE ACCESS FULL| STAGE_TBL | 1 | 2002 | 3 (0)| 00:00:01 | | 3 | XPATH EVALUATION | | | | | | --------------------------------------------------------------------------------
When the query is executed on a passenger XMLType (for example, a parameter, or a PL/SQL variable), Oracle cannot run the binary model and use a functional assessment based on memory of the XML DOM-like representation.
You can see that in the plan to explain it by spoting a 'COLLECTION ITERATOR PICKLER FETCH' operation.
So what explains the difference (in your version) between treatment from a column of XMLType (stored in binary XML format) or a variable or a parameter.
From 11.2.0.4 and beyond, things have changed a bit with Oracle, introducing a new transitional level of optimization on XMLType.
The plan of the explain command will show a "XMLTABLE ASSESSMENT' in this case.
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