How this procedure works internally?

HI Experts

I created the procedure (it is updated 50 million records in decent time) below, but I have some doubts.
(1) I'm not engage until the end. It will take the place of CANCELLATION. How can I ensure that this procedure is running until the end.
(2) if I increase the space UNDO how shall I increase whereas 50 million lines.
(3) should I take into account factors other than UNDO space when running this procedure if yes then wat are.
(4) suggest some links where I can find how sql and pl/sql objects queries internally.

CREATE OR REPLACE PROCEDURE ACCOUNTS_MIGRATION
IS
TYPE num_new_typ IS TABLE OF accounts.acc_no_new%TYPE ;
TYPE num_old_typ IS TABLE OF accounts.acc_no_old%TYPE ;
TYPE mat_records_typ IS TABLE OF mbk_audittrail.account1%TYPE;
TYPE mat_records_typ_1 IS TABLE OF mbk_audittrail.account2%TYPE;
TYPE mr_records_typ IS TABLE OF mbk_requests.account_no%TYPE;
TYPE mpgn_records_typ IS TABLE OF Mtx_payment_gateway_txn.PAYMENT_METHOD_NUMBER%TYPE;
TYPE mti_records_typ IS TABLE OF Mtx_transaction_items.ACCOUNT_ID%TYPE;


all_num_new num_new_typ:= num_new_typ();
all_num_old num_old_typ:= num_old_typ();
mat_records mat_records_typ:= mat_records_typ();
mat_records_1 mat_records_typ_1:= mat_records_typ_1();
mr_records mr_records_typ:= mr_records_typ();
mpgn_records mpgn_records_typ:= mpgn_records_typ();
mti_records mti_records_typ:= mti_records_typ();

BEGIN

   SELECT ACC_NO_OLD, ACC_NO_NEW bulk collect into all_num_old,all_num_new FROM ACCOUNTS;
   SELECT distinct ACCOUNT1 bulk collect INTO mat_records FROM MBK_AUDITTRAIL where account1 <> ' ';
   SELECT distinct ACCOUNT2 bulk collect INTO mat_records_1 FROM MBK_AUDITTRAIL where account2 <> ' ';
   SELECT distinct account_no bulk collect INTO mr_records FROM Mbk_requests where account_no <> ' ';
   SELECT distinct PAYMENT_METHOD_NUMBER bulk collect INTO mpgn_records FROM Mtx_payment_gateway_txn where PAYMENT_METHOD_NUMBER <> ' ';
   SELECT distinct ACCOUNT_ID bulk collect INTO mti_records FROM Mtx_transaction_items where ACCOUNT_ID <> ' ';

    FORALL i IN 1..mat_records.count
    UPDATE MBK_AUDITTRAIL SET ACCOUNT1=(SELECT ACC_NO_NEW FROM ACCOUNTS WHERE ACC_NO_OLD=mat_records(i) AND ROWNUM=1) WHERE ACCOUNT1=mat_records(i);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for MBK_AUDITTRAIL->ACCOUNT1');

    FORALL j IN 1..mat_records_1.count
    UPDATE MBK_AUDITTRAIL SET ACCOUNT2=(SELECT ACC_NO_NEW FROM ACCOUNTS WHERE ACC_NO_OLD=mat_records_1(j) AND ROWNUM=1) WHERE ACCOUNT2=mat_records(j);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for MBK_AUDITTRAIL->ACCOUNT2');

    FORALL k IN 1..all_num_old.count
    UPDATE MBK_BANK SET ACCOUNT_NO=all_num_new(k) WHERE ACCOUNT_NO=all_num_old(k);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for MBK_BANK->ACCOUNT_NO');

    FORALL l IN 1..all_num_old.count
    UPDATE MBK_CUST_ACCOUNTS SET ACCOUNT_NO=all_num_new(l) WHERE ACCOUNT_NO=all_num_old(l);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for MBK_CUST_ACCOUNTS->ACCOUNT_NO');

    FORALL m IN 1..all_num_old.count
    UPDATE Mtx_Payment_methods SET PAYMENT_METHOD_NUMBER=all_num_new(m) WHERE PAYMENT_METHOD_NUMBER=all_num_old(m);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for Mtx_Payment_methods->PAYMENT_METHOD_NUMBER');

    FORALL n IN 1..mr_records.count
    UPDATE Mbk_requests SET ACCOUNT_NO=(SELECT ACC_NO_NEW FROM ACCOUNTS WHERE ACC_NO_OLD=mr_records(n) AND ROWNUM=1) WHERE ACCOUNT_NO=mr_records(n);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for Mbk_requests->ACCOUNT_NO');

    FORALL o IN 1..mpgn_records.count
    UPDATE Mtx_payment_gateway_txn SET PAYMENT_METHOD_NUMBER=(SELECT ACC_NO_NEW FROM ACCOUNTS WHERE ACC_NO_OLD=mpgn_records(o) AND ROWNUM=1) WHERE PAYMENT_METHOD_NUMBER=mpgn_records(o);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for Mtx_payment_gateway_txn->PAYMENT_METHOD_NUMBER');

    FORALL p IN 1..mti_records.count
    UPDATE Mtx_transaction_items SET ACCOUNT_ID=(SELECT ACC_NO_NEW FROM ACCOUNTS WHERE ACC_NO_OLD=mti_records(p) AND ROWNUM=1) WHERE ACCOUNT_ID=mti_records(p);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for Mtx_transaction_items->ACCOUNT_ID');

    FORALL q IN 1..all_num_old.count
    UPDATE Temp_customer_mgmt SET ACCOUNT_NO=all_num_new(q) WHERE ACCOUNT_NO=all_num_old(q);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for Temp_customer_mgmt->ACCOUNT_NO');

    FORALL r IN 1..all_num_old.count
    UPDATE MTX_HIST_PIN_REGENERATION SET ACCOUNT_NO=all_num_new(r) WHERE ACCOUNT_NO=all_num_old(r);
    DBMS_OUTPUT.PUT_LINE(TO_CHAR(SQL%ROWCOUNT) || ' rows updated for MTX_HIST_PIN_REGENERATION->ACCOUNT_NO');

END;
Thanks and greetings
Saurabh Sharma

Don't forget have UNDO you also worry about it again!

If you create a new session for each test at each level of volume, you can query V$ SESSTAT for the statistiic "redo size" to identify bytes redo for each level of volume. And then extrapolate from there!

Hemant K Collette
http://hemantoracledba.blogspot.com

Published by: Hemant K grapple on July 20, 2009 17:02: ADDITION of Signature

Tags: Database

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