Maximum number of control files.

Hi Sir,
I read maximum number of control files we can multiplex is 8, just want to know any specific reason maximum 8 ?
I know that if we have mutliplue controlfiles it affect the perfromance because database has to record the status in all control files.
but curious to know anyspefic reason why maximum 8.
Thanks!

It is probably no coincidence the number is 8 --> 2 to the power of 3, which makes sure the controlfile number takes *4* bytes, so a half nibble. Somehow Oracle will probably encode multiple numbers in one byte.
Sybrand Bakker
Senior Oracle DBA

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NAME TYPE VALUE
session_max_open_files integer 10
Procuedure:
CREATE OR REPLACE PROCEDURE WMSOWN."PROC_WMS_XML_READ"
P_EVENT_KEY IN VARCHAR2,
X_STATUS_MSG OUT VARCHAR2,
X_STATUS OUT NUMBER
)AS
l_parser dbms_xmlparser.Parser;
domdoc xmldom.DOMDocument;
nodelist XMLDOM.DOMNODELIST;
node XMLDOM.DOMNODE;
n_child XMLDOM.DOMNODE;
elements XMLDOM.DOMELEMENT;
name_node_map XMLDOM.DOMNAMEDNODEMAP;
parent_seg varchar2(4000);
tag_name_bkp varchar2(4000); -- LOOK OUT BRAD IS CODING AGAIN
chile_seg VARCHAR2(4000);
p_seg VARCHAR2(4000);
p_seg1 VARCHAR2(4000);
p_seg2 VARCHAR2(30);
p_int_name VARCHAR2(50);
col_value VARCHAR2(100):=NULL;
len1 NUMBER;
cnt NUMBER;
seg_id_bkp NUMBER; -- LOOK OUT BRAD IS CODING AGAIN
sequence_bkp NUMBER; -- LOOK OUT BRAD IS CODING AGAIN
prev_sequence NUMBER; -- LOOK OUT BRAD IS CODING AGAIN
prev_seq_set VARCHAR2(3); --brad coding
parent_id number; ---brad coding
valid_seg NUMBER; -- LOOK OUT BRAD IS CODING AGAIN
data_status VARCHAR2(10);
v_main_seg VARCHAR2(50);
v_seq_no NUMBER;
V_CLOBLOCATOR CLOB;
V_FILELOCATOR BFILE;
v_amount_to_load NUMBER;
dest_offset NUMBER := 1;
src_offset NUMBER := 1;
lang_context NUMBER := DBMS_LOB.DEFAULT_LANG_CTX;
warning NUMBER;
v_event_name USR_OUB_FILE_PROCESS_DETAILS.EVENT_NAME%TYPE;
v_file_name USR_OUB_FILE_PROCESS_DETAILS.FILE_NAME%TYPE;
DIRECTORY_PATH_INVALID EXCEPTION;
PRAGMA EXCEPTION_INIT(DIRECTORY_PATH_INVALID,-22285);
NO_PRIVILEGES EXCEPTION;
PRAGMA EXCEPTION_INIT(NO_PRIVILEGES,-22286);
INVALID_DIRECTORY EXCEPTION;
PRAGMA EXCEPTION_INIT(INVALID_DIRECTORY,-22287);
FILE_NOT_FOUND EXCEPTION;
PRAGMA EXCEPTION_INIT(FILE_NOT_FOUND,-22289);
P_DIRECTORY VARCHAR2(50) :='WMS_XML_DIR_OUB';
v_whid poldat_view.wh_id%type;
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--NAME : PROC_WMS_XML_READ.PLS
--DESCRIPTION :
-- Procedure PROC_WMS_XML_READ search XML files from remote location.
-- Open,Parse and Read XML files. Store all XML values into tables.
-- Developed by Dharmesh Patidar(jw782)
-- History: New condition is added i.e. p_seg:=parent_seg to maintain PARENT and CHILD relationship
-- by Vishwanath Dubey(jl246) on 17-June-2011
-- BRAD_XML_DEBUG table removed for CLEANING Activity by DHARMESH PATIDAR(JW782) ON 29-JUNE-2011.
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BEGIN
SELECT event_name,file_name,WAREHOUSE_ID
INTO v_event_name, v_file_name,v_whid
FROM usr_oub_file_process_details
WHERE event_id=p_event_key
AND process_flag='U';
EXCEPTION
WHEN NO_DATA_FOUND THEN
x_status_msg:=SQLCODE||':'||' Error while selecting event name and event id in Procedure PROC_WMS_XML_READ : Record is not available in USR_OUB_FILE_PROCESS_DETAILS table for event id '|| P_EVENT_KEY;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN TOO_MANY_ROWS THEN
x_status_msg:=SQLCODE||':'||' Error while selecting event name and event id in Procedure PROC_WMS_XML_READ : More than one Records found in USR_OUB_FILE_PROCESS_DETAILS table for event id '|| P_EVENT_KEY;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN VALUE_ERROR THEN
x_status_msg:=SQLCODE||':'||' Error while selecting event name and event id in Procedure PROC_WMS_XML_READ : Varibale length is small or data type mismatch while selecting event id and event name in USR_OUB_FILE_PROCESS_DETAILS table for event id '|| P_EVENT_KEY;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN OTHERS THEN
x_status_msg:=SQLCODE||':'||'Error in Procedure PROC_WMS_XML_READ while selecting event name and event id ';
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
END;
/*BLOCK FOR CAPTURING EVENT NAME BASED ON EVENT ID END*/
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DBMS_LOB.CREATETEMPORARY(V_CLOBLOCATOR, TRUE);
V_FILELOCATOR := BFILENAME(P_DIRECTORY,V_FILE_NAME);
DBMS_LOB.OPEN(V_FILELOCATOR,DBMS_LOB.FILE_READONLY);
V_AMOUNT_TO_LOAD := DBMS_LOB.GETLENGTH(V_FILELOCATOR);
DBMS_LOB.LOADCLOBFROMFILE(V_CLOBLOCATOR,
V_FILELOCATOR ,
V_AMOUNT_TO_LOAD,
DEST_OFFSET,
SRC_OFFSET,
0,
LANG_CONTEXT,
WARNING);
dbms_lob.close(V_FILELOCATOR);
/*LOGIC TO READ XML FROM REMOTE LOCATION END*/
/*Temporary Code to help with debug Clear the table before populating it with new data*/
--delete table BRAD_XML_DEBUG;
cnt:=1;
seg_id_bkp:=0;
data_status:='N';
v_seq_no:=0;
prev_seq_set:='NO';
/*create new parser.*/
l_parser := dbms_xmlparser.newParser;
dbms_xmlparser.parseClob(l_parser, replace(V_CLOBLOCATOR,'&','1x2x3x4x5'));
/*Parse the document and create a new DOM document.*/
domdoc :=dbms_xmlparser.getDocument(l_parser);
/* get all elements in the DOM*/
nodelist := XMLDOM.getElementsByTagName(DOMDoc, '*');
len1 := XMLDOM.getLength(nodelist);
/* loop through elements of the DOM */
FOR j in 1..len1-1 LOOP --MAIN LOOP START
BEGIN
/*below sql will fetch Node from table to travel xml data*/
BEGIN
SELECT int_name,tag_name
INTO p_int_name, p_seg1
FROM usr_wms_tag_det
WHERE int_name=v_event_name
AND seq_no =cnt;
EXCEPTION
--PLEASE DO NOT HANDLE ANY EXCEPTION APART MENTIONED BELOW
WHEN OTHERS THEN
NULL;
END;
IF cnt=1 THEN
v_main_seg:=p_seg1;
END IF;
EXCEPTION
--PLEASE DO NOT HANDLE ANY EXCEPTION APART MENTIONED BELOW
WHEN no_data_found THEN
null;
WHEN OTHERS THEN
x_status_msg:=SQLCODE||':'||'Error in Procedure PROC_WMS_XML_READ while selecting interface name and tag name'||sqlerrm;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
END;
/*LOGICS TO READ XML START*/
node:=XMLDOM.item(nodelist, j);
elements:=XMLDOM.makeElement(node);
parent_seg:=(xmldom.getTagName(elements));
tag_name_bkp:=(xmldom.getTagName(elements));
name_node_map:=xmldom.getAttributes(node);
n_child:=xmldom.getFirstChild(node);
col_value:=xmldom.getNodeValue(n_child);
/*get the sequence number from the interface hierarchy table */
SELECT count(1)
INTO valid_seg
FROM usr_wms_tag_det
WHERE int_name=v_event_name
AND tag_name = tag_name_bkp;
if valid_seg>0 then
begin
SELECT seq_no
INTO sequence_bkp
FROM usr_wms_tag_det
WHERE int_name=v_event_name
AND tag_name = tag_name_bkp;
seg_id_bkp:=seg_id_bkp+1;
p_seg:=parent_seg;--Modified by Vishwanath Dubey dated 16-jun-2011
end;
end if;
if prev_seq_set = 'NO' then
begin
prev_sequence := sequence_bkp;
prev_seq_set := 'YES';
end;
end if;
if sequence_bkp < prev_sequence then --you just moved up level(s) in the message structure
begin
select max(seg_id)
into parent_id
from usr_wms_global_xml_det
where seg_sequence = sequence_bkp-1;
prev_sequence := sequence_bkp;
end;
end if;
if sequence_bkp > prev_sequence then --you just moved down a level in the message structure
parent_id := seg_id_bkp-1;
prev_sequence := sequence_bkp;
end if;
/*end getting the hierarchy table sequence */
/*LOGICS TO READ XML END */
IF (parent_seg =p_seg1) or (parent_seg=p_seg2) THEN
if parent_seg=v_main_seg then
v_seq_no:=v_seq_no+1;
end if;
BEGIN
/* INSERTING DATA LOGICS TO READ XML END */
INSERT INTO usr_wms_global_xml_det values(p_int_name,tag_name_bkp,parent_seg,seg_id_bkp,sequence_bkp,parent_id,'','','',J,v_seq_no,data_status,cnt);
EXCEPTION
WHEN OTHERS THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ while inserting records in USR_WMS_GLOBAL_XML_DET table for interface name and parent segment '||P_INT_NAME||','||PARENT_SEG;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
END ;
p_seg:=parent_seg;
p_seg2:=P_SEG1;
cnt:=cnt+1;
ELSE
chile_seg:=parent_seg;
BEGIN
/* INSERTING DATA LOGICS TO READ XML END */
INSERT INTO usr_wms_global_xml_det values(p_int_name,tag_name_bkp,p_seg,seg_id_bkp,sequence_bkp,parent_id,'',chile_seg,replace(TRIM(Col_Value),'1x2x3x4x5','&'),J,v_seq_no,data_status,cnt);
EXCEPTION
WHEN OTHERS THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ while inserting records in USR_WMS_GLOBAL_XML_DET table for interface name and parent segment '||P_INT_NAME||','||PARENT_SEG;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
END;
END IF;
END LOOP; --MAIN LOOP END
dbms_xmldom.freeDocument(DOMDoc);
x_status:=0;
EXCEPTION
WHEN DIRECTORY_PATH_INVALID THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ DIRECTORY PATH IS INVALID';
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN FILE_NOT_FOUND THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ INVALID XML FILE NAME OR FILE DOES NOT EXISTS';
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN NO_PRIVILEGES THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ Insufficient privileges on file or directory NAME- '||p_directory||' to perform FILEOPEN operation.';
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
RETURN;
WHEN OTHERS THEN
x_status_msg:=SQLCODE||' : Error in Procedure PROC_WMS_XML_READ '|| SQLERRM;
x_status:=SQLCODE;
proc_wms_error_trace(v_whid, --warehouse id
null , --event id
v_event_name , --event name
x_status, --error code
x_status_msg ); --error message
dbms_xmlparser.freeParser(l_parser);
dbms_xmldom.freeDocument(DOMDoc);
RETURN;
END PROC_WMS_XML_READ;
Edited by: user13427480 on Feb 8, 2013 7:08 PM

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