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what is ignore=y in import n export. Do we not to use in full export or import
[oracle@localhost trace]$ imp help=yes Import: Release 126.96.36.199.0 - Production on Sun Mar 3 11:39:54 2013 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. You can let Import prompt you for parameters by entering the IMP command followed by your username/password: Example: IMP SCOTT/TIGER Or, you can control how Import runs by entering the IMP command followed by various arguments. To specify parameters, you use keywords: Format: IMP KEYWORD=value or KEYWORD=(value1,value2,...,valueN) Example: IMP SCOTT/TIGER IGNORE=Y TABLES=(EMP,DEPT) FULL=N or TABLES=(T1:P1,T1:P2), if T1 is partitioned table USERID must be the first parameter on the command line. Keyword Description (Default) Keyword Description (Default) -------------------------------------------------------------------------- USERID username/password FULL import entire file (N) BUFFER size of data buffer FROMUSER list of owner usernames FILE input files (EXPDAT.DMP) TOUSER list of usernames SHOW just list file contents (N) TABLES list of table names IGNORE ignore create errors (N) RECORDLENGTH length of IO record GRANTS import grants (Y) INCTYPE incremental import type INDEXES import indexes (Y) COMMIT commit array insert (N) ROWS import data rows (Y) PARFILE parameter filename LOG log file of screen output CONSTRAINTS import constraints (Y) DESTROY overwrite tablespace data file (N) INDEXFILE write table/index info to specified file SKIP_UNUSABLE_INDEXES skip maintenance of unusable indexes (N) FEEDBACK display progress every x rows(0) TOID_NOVALIDATE skip validation of specified type ids FILESIZE maximum size of each dump file STATISTICS import precomputed statistics (always) RESUMABLE suspend when a space related error is encountered(N) RESUMABLE_NAME text string used to identify resumable statement RESUMABLE_TIMEOUT wait time for RESUMABLE COMPILE compile procedures, packages, and functions (Y) STREAMS_CONFIGURATION import streams general metadata (Y) STREAMS_INSTANTIATION import streams instantiation metadata (N) DATA_ONLY import only data (N) VOLSIZE number of bytes in file on each volume of a file on tape The following keywords only apply to transportable tablespaces TRANSPORT_TABLESPACE import transportable tablespace metadata (N) TABLESPACES tablespaces to be transported into database DATAFILES datafiles to be transported into database TTS_OWNERS users that own data in the transportable tablespace set Import terminated successfully without warnings. [oracle@localhost trace]$
Specifies how object creation errors should be handled. If you accept the default, IGNORE=n, Import logs or displays object creation errors before continuing.
If you specify IGNORE=y, Import overlooks object creation errors when it attempts to create database objects, and continues without reporting the errors.
Note that only object creation errors are ignored; other errors, such as operating system, database, and SQL errors, are not ignored and may cause processing to stop.
In situations where multiple refreshes from a single export file are done with IGNORE=y, certain objects can be created multiple times (although they will have unique system-defined names). You can prevent this for certain objects (for example, constraints) by doing an import with CONSTRAINTS=n. If you do a full import with CONSTRAINTS=n, no constraints for any tables are imported.
If a table already exists and IGNORE=y, then rows are imported into existing tables without any errors or messages being given. You might want to import data into tables that already exist in order to use new storage parameters or because you have already created the table in a cluster.
If a table already exists and IGNORE=n, then errors are reported and the table is skipped with no rows inserted. Also, objects dependent on tables, such as indexes, grants, and constraints, will not be created.
When you import into existing tables, if no column in the table is uniquely indexed, rows could be duplicated.