ORA-00054: resource busy and acquire with NOWAIT specified

ORA-00054: resource busy and acquire with NOWAIT specified
Cause: The NOWAIT keyword forced a return to the command prompt
because a resource was unavailable for a LOCK TABLE or SELECT FOR
UPDATE command.
Action: Try the command after a few minutes or enter the command without
the NOWAIT keyword.


Example:
SQL> alter table emp add (mobile varchar2(15));
*
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specified


How to avoid the ORA-00054:
    - Execute DDL at off-peak hours, when database is idle.
    - Execute DDL in maintenance window.
    - Find and Kill the session that is preventing the exclusive lock.


Other Solutions:

Solution 1:
In Oracle 11g you can set ddl_lock_timeout i.e. allow DDL to wait for the object to 
become available, simply specify how long you would like it to wait:
 
SQL> alter session set ddl_lock_timeout = 600;
Session altered.

SQL> alter table emp add (mobile varchar2(15));
Table altered. 


Solution 2:
Also In 11g, you can mark your table as read-only to prevent DML:
SQL> alter table emp read only;
Session altered.

SQL> alter table emp add (mobile varchar2(15));
Table altered.


Solution 3 (for 10g):
DECLARE
 MYSQL VARCHAR2(250) := 'alter table emp add (mobile varchar2(15))';
 IN_USE_EXCEPTION EXCEPTION;
 PRAGMA EXCEPTION_INIT(IN_USE_EXCEPTION, -54);
BEGIN
 WHILE TRUE LOOP
  BEGIN
   EXECUTE IMMEDIATE MYSQL;
   EXIT;
  EXCEPTION
   WHEN IN_USE_EXCEPTION THEN 
    NULL;
  END;
  DBMS_LOCK.SLEEP(1);
 END LOOP;
END;


Solution 4: 

Step 1: Identify the session which is locking the object
select a.sid, a.serial#
from v$session a, v$locked_object b, dba_objects c 
where b.object_id = c.object_id 
and a.sid = b.session_id
and OBJECT_NAME='EMP';

Step 2: kill that session using
alter system kill session 'sid,serial#'; 

Reference: http://docs.oracle.com/cd/B19306_01/server.102/b14219/e0.htm

Different ways to get dumpfile version - EXPDP

Lets suppose we have a dumpfile and we have no clue from which database or atleast which version of database it is exported. (assume we don’t have a log file)

We got a request to import it to other database. As per the compatibility matrix you can import only to higher versions and for this we need to know current dumpfile version.

In this situation, the following methods will help you….

Method # 1
+++++++

For classic export dump files on Unix systems, you can use below command

$ cat <dump_file_name> | head | strings

Method # 2
+++++++

From Oracle 10g, you have another way to do this. We can use DBMS_DATAPUMP.GET_DUMPFILE_INFO package to read the dumpfile header where this information will be stored. For this we need to use pre-defined stored procedure.


Here is the procedure script and other details, refer to MOS doc 462488.1

CONNECT system/manager 

CREATE OR REPLACE PROCEDURE show_dumpfile_info(
  p_dir  VARCHAR2 DEFAULT 'DATA_PUMP_DIR',
  p_file VARCHAR2 DEFAULT 'EXPDAT.DMP')
AS
-- p_dir        = directory object where dump file can be found
-- p_file       = simple filename of export dump file (case-sensitive)
  v_separator   VARCHAR2(80) := '--------------------------------------' ||
                                '--------------------------------------';
  v_path        all_directories.directory_path%type := '?';
  v_filetype    NUMBER;                 -- 0=unknown 1=expdp 2=exp 3=ext
  v_fileversion VARCHAR2(15);           -- 0.1=10gR1 1.1=10gR2 (etc.)
  v_info_table  sys.ku$_dumpfile_info;  -- PL/SQL table with file info
  type valtype  IS VARRAY(23) OF VARCHAR2(2048);
  var_values    valtype := valtype();
  no_file_found EXCEPTION;
  PRAGMA        exception_init(no_file_found, -39211);

BEGIN

-- Dump file details:
-- ==================
-- For Oracle10g Release 2 and higher:
--    dbms_datapump.KU$_DFHDR_FILE_VERSION        CONSTANT NUMBER := 1;
--    dbms_datapump.KU$_DFHDR_MASTER_PRESENT      CONSTANT NUMBER := 2;
--    dbms_datapump.KU$_DFHDR_GUID                CONSTANT NUMBER := 3;
--    dbms_datapump.KU$_DFHDR_FILE_NUMBER         CONSTANT NUMBER := 4;
--    dbms_datapump.KU$_DFHDR_CHARSET_ID          CONSTANT NUMBER := 5;
--    dbms_datapump.KU$_DFHDR_CREATION_DATE       CONSTANT NUMBER := 6;
--    dbms_datapump.KU$_DFHDR_FLAGS               CONSTANT NUMBER := 7;
--    dbms_datapump.KU$_DFHDR_JOB_NAME            CONSTANT NUMBER := 8;
--    dbms_datapump.KU$_DFHDR_PLATFORM            CONSTANT NUMBER := 9;
--    dbms_datapump.KU$_DFHDR_INSTANCE            CONSTANT NUMBER := 10;
--    dbms_datapump.KU$_DFHDR_LANGUAGE            CONSTANT NUMBER := 11;
--    dbms_datapump.KU$_DFHDR_BLOCKSIZE           CONSTANT NUMBER := 12;
--    dbms_datapump.KU$_DFHDR_DIRPATH             CONSTANT NUMBER := 13;
--    dbms_datapump.KU$_DFHDR_METADATA_COMPRESSED CONSTANT NUMBER := 14;
--    dbms_datapump.KU$_DFHDR_DB_VERSION          CONSTANT NUMBER := 15;
-- For Oracle11gR1:
--    dbms_datapump.KU$_DFHDR_MASTER_PIECE_COUNT  CONSTANT NUMBER := 16;
--    dbms_datapump.KU$_DFHDR_MASTER_PIECE_NUMBER CONSTANT NUMBER := 17;
--    dbms_datapump.KU$_DFHDR_DATA_COMPRESSED     CONSTANT NUMBER := 18;
--    dbms_datapump.KU$_DFHDR_METADATA_ENCRYPTED  CONSTANT NUMBER := 19;
--    dbms_datapump.KU$_DFHDR_DATA_ENCRYPTED      CONSTANT NUMBER := 20;
-- For Oracle11gR2:
--    dbms_datapump.KU$_DFHDR_COLUMNS_ENCRYPTED   CONSTANT NUMBER := 21;
--    dbms_datapump.KU$_DFHDR_ENCRIPTION_MODE     CONSTANT NUMBER := 22;
-- For Oracle12cR1:
--    dbms_datapump.KU$_DFHDR_COMPRESSION_ALG     CONSTANT NUMBER := 23;

-- For Oracle10gR2: KU$_DFHDR_MAX_ITEM_CODE       CONSTANT NUMBER := 15;
-- For Oracle11gR1: KU$_DFHDR_MAX_ITEM_CODE       CONSTANT NUMBER := 20;
-- For Oracle11gR2: KU$_DFHDR_MAX_ITEM_CODE       CONSTANT NUMBER := 22;
-- For Oracle12cR1: KU$_DFHDR_MAX_ITEM_CODE       CONSTANT NUMBER := 23;

-- Show header output info:
-- ========================

  dbms_output.put_line(v_separator);
  dbms_output.put_line('Purpose..: Obtain details about export ' ||
        'dumpfile.        Version: 18-DEC-2013');
  dbms_output.put_line('Required.: RDBMS version: 10.2.0.1.0 or higher');
  dbms_output.put_line('.          ' ||
        'Export dumpfile version: 7.3.4.0.0 or higher');
  dbms_output.put_line('.          ' ||
        'Export Data Pump dumpfile version: 10.1.0.1.0 or higher');
  dbms_output.put_line('Usage....: ' ||
        'execute show_dumfile_info(''DIRECTORY'', ''DUMPFILE'');');
  dbms_output.put_line('Example..: ' ||
        'exec show_dumfile_info(''MY_DIR'', ''expdp_s.dmp'')');
  dbms_output.put_line(v_separator);
  dbms_output.put_line('Filename.: ' || p_file);
  dbms_output.put_line('Directory: ' || p_dir);

-- Retrieve Export dumpfile details:
-- =================================

  SELECT directory_path INTO v_path FROM all_directories
   WHERE directory_name = p_dir
      OR directory_name = UPPER(p_dir);

  dbms_datapump.get_dumpfile_info(
           filename   => p_file,       directory => UPPER(p_dir),
           info_table => v_info_table, filetype  => v_filetype);

  var_values.EXTEND(23);
  FOR i in 1 .. 23 LOOP
    BEGIN
      SELECT value INTO var_values(i) FROM TABLE(v_info_table)
       WHERE item_code = i;
    EXCEPTION WHEN OTHERS THEN var_values(i) := '';
    END;
  END LOOP;

  dbms_output.put_line('Disk Path: ' || v_path);

  IF v_filetype >= 1 THEN
    -- Get characterset name:
    BEGIN
      SELECT var_values(5) || ' (' || nls_charset_name(var_values(5)) ||
        ')' INTO var_values(5) FROM dual;
    EXCEPTION WHEN OTHERS THEN null;
    END;
    IF v_filetype = 2 THEN
      dbms_output.put_line(
         'Filetype.: ' || v_filetype || ' (Original Export dumpfile)');
      dbms_output.put_line(v_separator);
      SELECT DECODE(var_values(13), '0', '0 (Conventional Path)',
        '1', '1 (Direct Path)', var_values(13))
        INTO var_values(13) FROM dual;
      dbms_output.put_line('...Characterset ID of source db..: ' || var_values(5));
      dbms_output.put_line('...Direct Path Export Mode.......: ' || var_values(13));
      dbms_output.put_line('...Export Version................: ' || var_values(15));
    ELSIF v_filetype = 1 OR v_filetype = 3 THEN
      SELECT SUBSTR(var_values(1), 1, 15) INTO v_fileversion FROM dual;
      SELECT DECODE(var_values(1),
                    '0.1', '0.1 (Oracle10g Release 1: 10.1.0.x)',
                    '1.1', '1.1 (Oracle10g Release 2: 10.2.0.x)',
                    '2.1', '2.1 (Oracle11g Release 1: 11.1.0.x)',
                    '3.1', '3.1 (Oracle11g Release 2: 11.2.0.x)',
                    '4.1', '4.1 (Oracle12c Release 1: 12.1.0.x)',
        var_values(1)) INTO var_values(1) FROM dual;
      SELECT DECODE(var_values(2), '0', '0 (No)', '1', '1 (Yes)',
        var_values(2)) INTO var_values(2) FROM dual;
      SELECT DECODE(var_values(14), '0', '0 (No)', '1', '1 (Yes)',
        var_values(14)) INTO var_values(14) FROM dual;
      SELECT DECODE(var_values(18), '0', '0 (No)', '1', '1 (Yes)',
        var_values(18)) INTO var_values(18) FROM dual;
      SELECT DECODE(var_values(19), '0', '0 (No)', '1', '1 (Yes)',
        var_values(19)) INTO var_values(19) FROM dual;
      SELECT DECODE(var_values(20), '0', '0 (No)', '1', '1 (Yes)',
        var_values(20)) INTO var_values(20) FROM dual;
      SELECT DECODE(var_values(21), '0', '0 (No)', '1', '1 (Yes)',
        var_values(21)) INTO var_values(21) FROM dual;
      SELECT DECODE(var_values(22),
                    '1', '1 (Unknown)',
                    '2', '2 (None)',
                    '3', '3 (Password)',
                    '4', '4 (Password and Wallet)',
                    '5', '5 (Wallet)',
        var_values(22)) INTO var_values(22) FROM dual;
      SELECT DECODE(var_values(23),
                    '2', '2 (None)',
                    '3', '3 (Basic)',
                    '4', '4 (Low)',
                    '5', '5 (Medium)',
                    '6', '6 (High)',
        var_values(23)) INTO var_values(23) FROM dual;
      IF v_filetype = 1 THEN
        dbms_output.put_line(
           'Filetype.: ' || v_filetype || ' (Export Data Pump dumpfile)');
        dbms_output.put_line(v_separator);
        dbms_output.put_line('...Database Job Version..........: ' || var_values(15));
        dbms_output.put_line('...Internal Dump File Version....: ' || var_values(1));
        dbms_output.put_line('...Creation Date.................: ' || var_values(6));
        dbms_output.put_line('...File Number (in dump file set): ' || var_values(4));
        dbms_output.put_line('...Master Present in dump file...: ' || var_values(2));
        IF dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE > 15 AND v_fileversion >= '2.1' THEN
          dbms_output.put_line('...Master in how many dump files.: ' || var_values(16));
          dbms_output.put_line('...Master Piece Number in file...: ' || var_values(17));
        END IF;
        dbms_output.put_line('...Operating System of source db.: ' || var_values(9));
        IF v_fileversion >= '2.1' THEN
          dbms_output.put_line('...Instance Name of source db....: ' || var_values(10));
        END IF;
        dbms_output.put_line('...Characterset ID of source db..: ' || var_values(5));
        dbms_output.put_line('...Language Name of characterset.: ' || var_values(11));
        dbms_output.put_line('...Job Name......................: ' || var_values(8));
        dbms_output.put_line('...GUID (unique job identifier)..: ' || var_values(3));
        dbms_output.put_line('...Block size dump file (bytes)..: ' || var_values(12));
        dbms_output.put_line('...Metadata Compressed...........: ' || var_values(14));
        IF dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE > 15 THEN
          dbms_output.put_line('...Data Compressed...............: ' || var_values(18));
          IF dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE > 22 AND v_fileversion >= '4.1' THEN
            dbms_output.put_line('...Compression Algorithm.........: ' || var_values(23));
          END IF;
          dbms_output.put_line('...Metadata Encrypted............: ' || var_values(19));
          dbms_output.put_line('...Table Data Encrypted..........: ' || var_values(20));
          dbms_output.put_line('...Column Data Encrypted.........: ' || var_values(21));
          dbms_output.put_line('...Encryption Mode...............: ' || var_values(22));
        END IF;
      ELSE
        dbms_output.put_line(
           'Filetype.: ' || v_filetype || ' (External Table dumpfile)');
        dbms_output.put_line(v_separator);
        dbms_output.put_line('...Database Job Version..........: ' || var_values(15));
        dbms_output.put_line('...Internal Dump File Version....: ' || var_values(1));
        dbms_output.put_line('...Creation Date.................: ' || var_values(6));
        dbms_output.put_line('...File Number (in dump file set): ' || var_values(4));
        dbms_output.put_line('...Operating System of source db.: ' || var_values(9));
        IF v_fileversion >= '2.1' THEN
          dbms_output.put_line('...Instance Name of source db....: ' || var_values(10));
        END IF;
        dbms_output.put_line('...Characterset ID of source db..: ' || var_values(5));
        dbms_output.put_line('...Language Name of characterset.: ' || var_values(11));
        dbms_output.put_line('...GUID (unique job identifier)..: ' || var_values(3));
        dbms_output.put_line('...Block size dump file (bytes)..: ' || var_values(12));
        IF dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE > 15 THEN
          dbms_output.put_line('...Data Compressed...............: ' || var_values(18));
          IF dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE > 22 AND v_fileversion >= '4.1' THEN
            dbms_output.put_line('...Compression Algorithm.........: ' || var_values(23));
          END IF;
          dbms_output.put_line('...Table Data Encrypted..........: ' || var_values(20));
          dbms_output.put_line('...Encryption Mode...............: ' || var_values(22));
        END IF;
      END IF;
      dbms_output.put_line('...Internal Flag Values..........: ' || var_values(7));
      dbms_output.put_line('...Max Items Code (Info Items)...: ' ||
                  dbms_datapump.KU$_DFHDR_MAX_ITEM_CODE);
    END IF;
  ELSE
    dbms_output.put_line('Filetype.: ' || v_filetype);
    dbms_output.put_line(v_separator);
    dbms_output.put_line('ERROR....: Not an export dumpfile.');
  END IF;
  dbms_output.put_line(v_separator);

EXCEPTION
  WHEN no_data_found THEN
    dbms_output.put_line('Disk Path: ?');
    dbms_output.put_line('Filetype.: ?');
    dbms_output.put_line(v_separator);
    dbms_output.put_line('ERROR....: Directory Object does not exist.');
    dbms_output.put_line(v_separator);
  WHEN no_file_found THEN
    dbms_output.put_line('Disk Path: ' || v_path);
    dbms_output.put_line('Filetype.: ?');
    dbms_output.put_line(v_separator);
    dbms_output.put_line('ERROR....: File does not exist.');
    dbms_output.put_line(v_separator);
END;

/

Sample Output

SET serveroutput on SIZE 1000000

ORA-02374, ORA-12899, ORA-02372 during Data Pump expdp/impdp from 12c WE8MSWIN1252 into 12c AL32UTF8

PROBLEM

During a data pump expdp/impdp from 12c WE8MSWIN1252 into 12c AL32UTF8, I received several errors in the data pump import log file:

07-JUN-18 17:00:12.953: ORA-02374: conversion error loading table "XXX"."ABC"
07-JUN-18 17:00:12.953: ORA-12899: value too large for column ABC_NDC (actual: 22, maximum: 11)
07-JUN-18 17:00:12.953: ORA-02372: data for row: ABC_NDC : 0X'9F9F9F9F9F9F9F9F9F9F9F'


07-JUN-18 22:46:02.663: KUP-11007: conversion error loading table "XXX"."ABC"
07-JUN-18 22:46:02.663: ORA-12899: value too large for column ABC_TOB (actual: 5, maximum: 4)
07-JUN-18 22:46:02.663: KUP-11009: data for row: ABC_TOB : 0X'303136A0'

CAUSE

The cause of these errors is related to the fact that I am migrating data from a database with a single-byte character set (WE8MSWIN1252) into one with a multi-byte character set (AL32UTF8). This means that some single-byte characters will be “expanded” into multi-byte characters, and if the column was already filled completely, ORA-12899 will be raised, showing the maximum allowed column value and the actual value needed to fit all the characters into the multi-byte column.

There are several solutions to this problem: increase the size of the source column or truncate the data before the import, stick to the same character set, pre-create the tables with modified column sizes in the source database before the import

If you have a lot of rows with conversion errors in your import log file, there’s another solution. This requires the installation of the Database Character Set Scanner utility (csscan) into your source database.

Csscan is installed by running the csminst.sql script under $ORACLE_HOME/rdbms/admin. This script will create a user “csmig”. It’s a good idea to first modify the following line so the user csmig doesn’t write into the SYSTEM tablespace:

alter user csmig default tablespace SYSTEM quota unlimited on SYSTEM

In my case, I replaced SYSTEM by SYSAUX.

Let’s install csscan into our source database:

$ cd $ORACLE_HOME/rdbms/admin
$ sqlplus /nolog

SQL*Plus: Release 12.2.0.1.0 Production on Fri Jun 8 11:28:41 2018

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

SQL> conn / as sysdba
Connected.
SQL> set TERMOUT ON
SQL> set ECHO ON
SQL> spool csminst.log
SQL> @csminst.sql

After this you should check the csminst.log file for errors. 

Now that csscan is installed, you can use it to check specific schemas or tables for data conversion problems during the migration to another character set. I executed it as follows (you will need the password of the SYS user):

$ csscan \”sys as sysdba\” LOG=/tmp/csscan.log USER=XXX CAPTURE=Y TOCHAR=AL32UTF8 ARRAY=1024000 PROCESS=3

This will analyze all character data stored in the tables of the schema "VSVW2LO112_1801". The script will create 3 log files. The log file with the extension “.err” has the list of all affected rows with their corresponding ROWID’s. You can count the affected rows from the log file using the UNIX “grep” command:

$ grep -i “exceed column size” /tmp/csscan.log.err|wc -l

38

So, in my case, 38 rows from the "" schema will have conversion problems during the migration to the AL32UTF8 character set.

You can remove csscan by dropping the user “csmig”. More information regarding csscan can be found on My Oracle Support, please see document ID 1297961.1.

select VALUE, ISDEFAULT   from v$parameter   where NAME='nls_length_semantics';
VALUE           ISDEFAULT
--------------- --------------------
BYTE            TRUE

select VALUE   from nls_database_parameters   where parameter='NLS_CHARACTERSET';
VALUE
---------------

WE8MSWIN1252

DataPump Export (EXPDP) Fails With Error ORA-39826

SYMPTOM

06-JUN-18 09:27:43.735: ORA-31693: Table data object "XXX"."LOC_PK_ID" failed to load/unload and is being skipped due to error:

06-JUN-18 09:27:43.735: ORA-31693: Table data object "XXX"."LOC_PK_ID" failed to load/unload and is being skipped due to error:
x

ORA-02354: error in exporting/importing data

ORA-39826: Direct path load of view or synonym (XXX.LOC_PK_ID) could not be resolved.

06-JUN-18 09:27:43.742: ORA-31693: Table data object "XXX"."PL_PK_ID" failed to load/unload and is being skipped due to error:

ORA-02354: error in exporting/importing data

ORA-39826: Direct path load of view or synonym (XXX.PL_PK_ID) could not be resolved.
 

CAUSE

Export backup has completed and backup was validated.  The below error was because of table was dropped during the run-time of EXPDP export that’s why doesn't find the table at the time of exporting that table.


 

SOLUTION

 

Please check whether the objects reported in the error message exist or not. The example below is related to the object mentioned in above error message:

SELECT OWNER, OBJECT_NAME, OBJECT_TYPE, STAUS, LAST_DDL_TIME

FROM   DBA_OBJECTS

WHERE  OWNER = 'XXX' AND OBJECT_NAME IN ('LOC_PK_ID');

no row selected
 

If the query returns no rows, then you can expect the ORA-39826 is raised. You should make sure that the object exists when it is exported and it is not removed during the runtime of export. Dropping an object during the master control table of DataPump export is created and filled but before the actual table contents are exported, will result in these type of error.