Monitoring Streams Replication| How to Display Detailed Information About Apply Errors?

Posted By Sagar Patil

SQL scripts below can display detailed information about error transactions in the error queue in a database.
These scripts are designed to display information about LCRs, but you can extend them to display information about any non-LCR messages used.

To use these scripts, complete the following steps:

Step 1) Grant Explicit SELECT Privilege on the DBA_APPLY_ERROR View
Step 2) Create a Procedure that Prints the Value in an ANYDATA Object
Step 3) Create a Procedure that Prints a Specified LCR
Step 4) Create a Procedure that Prints All the LCRs in the Error Queue
Step 5) Create a Procedure that Prints All the Error LCRs for a Transaction

Step 1   Grant Explicit SELECT Privilege on the DBA_APPLY_ERROR View

The user who creates and runs the print_errors and print_transaction procedures described in the following sections must be granted explicit SELECT privilege on the DBA_APPLY_ERROR data dictionary view. This privilege cannot be granted through a role. Running the GRANT_ADMIN_PRIVILEGE procedure in the DBMS_STREAMS_AUTH package on a user grants this privilege to the user. To grant this privilege to a user directly, complete the following steps:

GRANT SELECT ON DBA_APPLY_ERROR TO strmadmin;
GRANT EXECUTE ON DBMS_APPLY_ADM TO strmadmin;

Step 2   Create a Procedure that Prints the Value in an ANYDATA Object
The following procedure prints the value in a specified ANYDATA object for some selected data types. Optionally, you can add more data types to this procedure.

CREATE OR REPLACE PROCEDURE print_any(data IN ANYDATA) IS
tn  VARCHAR2(61);
str VARCHAR2(4000);
CHR VARCHAR2(1000);
num NUMBER;
dat DATE;
rw  RAW(4000);
res NUMBER;
BEGIN
IF data IS NULL THEN
DBMS_OUTPUT.PUT_LINE('NULL value');
RETURN;
END IF;
tn := data.GETTYPENAME();
IF tn = 'SYS.VARCHAR2' THEN
res := data.GETVARCHAR2(str);
DBMS_OUTPUT.PUT_LINE(SUBSTR(str,0,253));
ELSIF tn = 'SYS.CHAR' THEN
res := data.GETCHAR(CHR);
DBMS_OUTPUT.PUT_LINE(SUBSTR(CHR,0,253));
ELSIF tn = 'SYS.VARCHAR' THEN
res := data.GETVARCHAR(CHR);
DBMS_OUTPUT.PUT_LINE(CHR);
ELSIF tn = 'SYS.NUMBER' THEN
res := data.GETNUMBER(num);
DBMS_OUTPUT.PUT_LINE(num);
ELSIF tn = 'SYS.DATE' THEN
res := data.GETDATE(dat);
DBMS_OUTPUT.PUT_LINE(dat);
ELSIF tn = 'SYS.RAW' THEN
-- res := data.GETRAW(rw);
-- DBMS_OUTPUT.PUT_LINE(SUBSTR(DBMS_LOB.SUBSTR(rw),0,253));
DBMS_OUTPUT.PUT_LINE('BLOB Value');
ELSIF tn = 'SYS.BLOB' THEN
DBMS_OUTPUT.PUT_LINE('BLOB Found');
ELSE
DBMS_OUTPUT.PUT_LINE('typename is ' || tn);
END IF;
END print_any;
/

Step 3   Create a Procedure that Prints a Specified LCR
The following procedure prints a specified LCR. It calls the print_any procedure created in “Create a Procedure that Prints the Value in an ANYDATA Object”.

CREATE OR REPLACE PROCEDURE print_lcr(lcr IN ANYDATA) IS
typenm    VARCHAR2(61);
ddllcr    SYS.LCR$_DDL_RECORD;
proclcr   SYS.LCR$_PROCEDURE_RECORD;
rowlcr    SYS.LCR$_ROW_RECORD;
res       NUMBER;
newlist   SYS.LCR$_ROW_LIST;
oldlist   SYS.LCR$_ROW_LIST;
ddl_text  CLOB;
ext_attr  ANYDATA;
BEGIN
typenm := lcr.GETTYPENAME();
DBMS_OUTPUT.PUT_LINE('type name: ' || typenm);
IF (typenm = 'SYS.LCR$_DDL_RECORD') THEN
res := lcr.GETOBJECT(ddllcr);
DBMS_OUTPUT.PUT_LINE('source database: ' ||
ddllcr.GET_SOURCE_DATABASE_NAME);
DBMS_OUTPUT.PUT_LINE('owner: ' || ddllcr.GET_OBJECT_OWNER);
DBMS_OUTPUT.PUT_LINE('object: ' || ddllcr.GET_OBJECT_NAME);
DBMS_OUTPUT.PUT_LINE('is tag null: ' || ddllcr.IS_NULL_TAG);
DBMS_LOB.CREATETEMPORARY(ddl_text, TRUE);
ddllcr.GET_DDL_TEXT(ddl_text);
DBMS_OUTPUT.PUT_LINE('ddl: ' || ddl_text);
-- Print extra attributes in DDL LCR
ext_attr := ddllcr.GET_EXTRA_ATTRIBUTE('serial#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('serial#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := ddllcr.GET_EXTRA_ATTRIBUTE('session#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('session#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := ddllcr.GET_EXTRA_ATTRIBUTE('thread#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('thread#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := ddllcr.GET_EXTRA_ATTRIBUTE('tx_name');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('transaction name: ' || ext_attr.ACCESSVARCHAR2());
END IF;
ext_attr := ddllcr.GET_EXTRA_ATTRIBUTE('username');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('username: ' || ext_attr.ACCESSVARCHAR2());
END IF;
DBMS_LOB.FREETEMPORARY(ddl_text);
ELSIF (typenm = 'SYS.LCR$_ROW_RECORD') THEN
res := lcr.GETOBJECT(rowlcr);
DBMS_OUTPUT.PUT_LINE('source database: ' ||
rowlcr.GET_SOURCE_DATABASE_NAME);
DBMS_OUTPUT.PUT_LINE('owner: ' || rowlcr.GET_OBJECT_OWNER);
DBMS_OUTPUT.PUT_LINE('object: ' || rowlcr.GET_OBJECT_NAME);
DBMS_OUTPUT.PUT_LINE('is tag null: ' || rowlcr.IS_NULL_TAG);
DBMS_OUTPUT.PUT_LINE('command_type: ' || rowlcr.GET_COMMAND_TYPE);
oldlist := rowlcr.GET_VALUES('old');
FOR i IN 1..oldlist.COUNT LOOP
IF oldlist(i) IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('old(' || i || '): ' || oldlist(i).column_name);
print_any(oldlist(i).data);
END IF;
END LOOP;
newlist := rowlcr.GET_VALUES('new', 'n');
FOR i IN 1..newlist.COUNT LOOP
IF newlist(i) IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('new(' || i || '): ' || newlist(i).column_name);
print_any(newlist(i).data);
END IF;
END LOOP;
-- Print extra attributes in row LCR
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('row_id');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('row_id: ' || ext_attr.ACCESSUROWID());
END IF;
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('serial#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('serial#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('session#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('session#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('thread#');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('thread#: ' || ext_attr.ACCESSNUMBER());
END IF;
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('tx_name');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('transaction name: ' || ext_attr.ACCESSVARCHAR2());
END IF;
ext_attr := rowlcr.GET_EXTRA_ATTRIBUTE('username');
IF (ext_attr IS NOT NULL) THEN
DBMS_OUTPUT.PUT_LINE('username: ' || ext_attr.ACCESSVARCHAR2());
END IF;
ELSE
DBMS_OUTPUT.PUT_LINE('Non-LCR Message with type ' || typenm);
END IF;
END print_lcr;
/

Step 4   Create a Procedure that Prints All the LCRs in the Error Queue

The following procedure prints all of the LCRs in all of the error queues. It calls the print_lcr procedure created in ” Step3) Create a Procedure that Prints a Specified LCR”.

CREATE OR REPLACE PROCEDURE print_errors IS
CURSOR c IS
SELECT LOCAL_TRANSACTION_ID,
SOURCE_DATABASE,
MESSAGE_NUMBER,
MESSAGE_COUNT,
ERROR_NUMBER,
ERROR_MESSAGE
FROM DBA_APPLY_ERROR
ORDER BY SOURCE_DATABASE, SOURCE_COMMIT_SCN;
i      NUMBER;
txnid  VARCHAR2(30);
source VARCHAR2(128);
msgno  NUMBER;
msgcnt NUMBER;
errnum NUMBER := 0;
errno  NUMBER;
errmsg VARCHAR2(2000);
lcr    ANYDATA;
r      NUMBER;
BEGIN
FOR r IN c LOOP
errnum := errnum + 1;
msgcnt := r.MESSAGE_COUNT;
txnid  := r.LOCAL_TRANSACTION_ID;
source := r.SOURCE_DATABASE;
msgno  := r.MESSAGE_NUMBER;
errno  := r.ERROR_NUMBER;
errmsg := r.ERROR_MESSAGE;
DBMS_OUTPUT.PUT_LINE('*************************************************');
DBMS_OUTPUT.PUT_LINE('----- ERROR #' || errnum);
DBMS_OUTPUT.PUT_LINE('----- Local Transaction ID: ' || txnid);
DBMS_OUTPUT.PUT_LINE('----- Source Database: ' || source);
DBMS_OUTPUT.PUT_LINE('----Error in Message: '|| msgno);
DBMS_OUTPUT.PUT_LINE('----Error Number: '||errno);
DBMS_OUTPUT.PUT_LINE('----Message Text: '||errmsg);
FOR i IN 1..msgcnt LOOP
DBMS_OUTPUT.PUT_LINE('--message: ' || i);
lcr := DBMS_APPLY_ADM.GET_ERROR_MESSAGE(i, txnid);
print_lcr(lcr);
END LOOP;
END LOOP;
END print_errors;
/

To run this procedure after you create it, enter the following:

SET SERVEROUTPUT ON SIZE 1000000
EXEC print_errors

Step 5   Create a Procedure that Prints All the Error LCRs for a Transaction
The following procedure prints all the LCRs in the error queue for a particular transaction. It calls the print_lcr procedure created in “Create a Procedure that Prints a Specified LCR”.

CREATE OR REPLACE PROCEDURE print_transaction(ltxnid IN VARCHAR2) IS
i      NUMBER;
txnid  VARCHAR2(30);
source VARCHAR2(128);
msgno  NUMBER;
msgcnt NUMBER;
errno  NUMBER;
errmsg VARCHAR2(2000);
lcr    ANYDATA;
BEGIN
SELECT LOCAL_TRANSACTION_ID,
SOURCE_DATABASE,
MESSAGE_NUMBER,
MESSAGE_COUNT,
ERROR_NUMBER,
ERROR_MESSAGE
INTO txnid, source, msgno, msgcnt, errno, errmsg
FROM DBA_APPLY_ERROR
WHERE LOCAL_TRANSACTION_ID =  ltxnid;
DBMS_OUTPUT.PUT_LINE('----- Local Transaction ID: ' || txnid);
DBMS_OUTPUT.PUT_LINE('----- Source Database: ' || source);
DBMS_OUTPUT.PUT_LINE('----Error in Message: '|| msgno);
DBMS_OUTPUT.PUT_LINE('----Error Number: '||errno);
DBMS_OUTPUT.PUT_LINE('----Message Text: '||errmsg);
FOR i IN 1..msgcnt LOOP
DBMS_OUTPUT.PUT_LINE('--message: ' || i);
lcr := DBMS_APPLY_ADM.GET_ERROR_MESSAGE(i, txnid); -- gets the LCR
print_lcr(lcr);
END LOOP;
END print_transaction;
/

To run this procedure after you create it, pass to it the local transaction identifier of a error transaction. For example, if the local transaction identifier is 1.17.2485, then enter the following:

SET SERVEROUTPUT ON SIZE 1000000
EXEC print_transaction('1.17.2485')

How to locate local transaction identifier of a error transaction? To check for apply errors, run the following query:

COLUMN APPLY_NAME HEADING 'Apply|Process|Name' FORMAT A10
COLUMN SOURCE_DATABASE HEADING 'Source|Database' FORMAT A10
COLUMN LOCAL_TRANSACTION_ID HEADING 'Local|Transaction|ID' FORMAT A11
COLUMN ERROR_NUMBER HEADING 'Error Number' FORMAT 99999999
COLUMN ERROR_MESSAGE HEADING 'Error Message' FORMAT A20
COLUMN MESSAGE_COUNT HEADING 'Messages in|Error|Transaction' FORMAT 99999999
 
SELECT APPLY_NAME,
       SOURCE_DATABASE,
       LOCAL_TRANSACTION_ID,
       ERROR_NUMBER,
       ERROR_MESSAGE,
       MESSAGE_COUNT
  FROM DBA_APPLY_ERROR;

If there are any apply errors, then your output looks similar to the following:

Apply                 Local                                         Messages in
Process    Source     Transaction                                         Error
Name       Database   ID          Error Number Error Message        Transaction
---------- ---------- ----------- ------------ -------------------- -----------
APPLY_FROM MULT3.EXAM 1.62.948            1403 ORA-01403: no data found     1_MULT3PLE.COM
APPLY_FROM MULT2.EXAM 1.54.948            1403 ORA-01403: no data found     1_MULT2PLE.COM

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One Response to “ Monitoring Streams Replication| How to Display Detailed Information About Apply Errors? ”

  1. Streams Replication| Monitoring Oracle Streams Apply Processes at Destination Server | EveryDay Practical Solutions for an Oracle/SQL Server DBA On 18 November 2011 at 1:33 pm

    [...] Monitoring Streams Replication| How to Display Detailed Information About Apply Errors? [...]

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