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SQL Navigator for Oracle 7.4 - Release Notes

Import Table

Open the Import Tables window

Open the Import Tables window from Object Menu | Import Table.

 

Select the tables to import (1)

Option Further Options and Description

Import all tables

Import all tables in the DMP file into the current user's schema regardless of which user the tables belong to.

Specify From User To User

Import all the tables owned by the From User to the To User. Specify the from and to users in the relevant fields.

To import tables from more than one user, use a space or comma (,) to separate the user names.

Manually enter table names

Type the names of the tables to import and click Add.

Do not include the schema prefix in the table name.

 

Select import options (2)

Option Description

Objects to export

Select the objects you want imported to the database from the DMP file.

Additional Parameters

Field Description

Reuse existing data files

Reuses the existing datafiles making up the database. Selecting this parameter causes the Import utility to include the Reuse parameter in the datafile clause of the CREATE TABLESPACE statement. This results in the Import utility reusing the original database's datafiles after deleting their contents.

Note:

  • The export file contains the datafile names used in each tablespace. If you select this parameter and attempt to create a second database on the same system the Import utility will overwrite the first database's datafiles when it creates the tablespace. In this situation, it is recommended that this parameter is deselected so that an error occurs if the datafiles already exist when the tablespace is created. In addition, if you need to import into the original database, select the Ignore errors parameter to add to the existing datafiles without replacing them.
  • If datafiles are stored on a raw device, deselecting this parameter does not prevent files from being overwritten.

Commit after each array insert

Sets the Import utility to commit after each array insert.

By default, the Import utility commits only after loading each table. If an error occurs, a rollback is performed before continuing with the next object.

Selecting this parameter prevents rollback segments from growing inordinately large and improves the performance of large imports. If the table has a uniqueness constraint it is recommended that this parameter is selected. If a table does not have a uniqueness constraint, the Import utility could produce duplicate rows if you reimport the data.

If a table has nested table columns or attributes, the contents of the nested tables are imported as separate tables. Therefore, the contents of the nested tables are always committed in a transaction distinct from the transaction used to commit the outer table.

If this parameter is not selected and a table is partitioned, each partition and subpartition in the export file are imported in a separate transaction.

For tables containing LONG, LOB, BFILE, REF, ROWID, UROWID, or DATE columns, array inserts are not done. If this parameter is selected, the Import utility commits these tables after each row.

Ignore errors

Specifies how object creation errors should be handled. If selected, the Import utility 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 and this parameter is selected, certain objects may be created multiple times (although they will have unique system-defined names). You can prevent this for certain objects (for example, constraints) by deselecting the Constraints parameter when importing. If you do a full import with the Constraints parameter deselected, no constraints for any tables are imported.

If a table already exists and the Ignore errors parameter is selected, then rows are imported into existing tables without any errors or messages being given. This may be helpful when importing 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 this parameter is not selected, the Import utility logs or displays object creation errors before continuing. If a table already exists, then errors are reported and the table is skipped with no rows inserted. Objects dependent on tables, such as indexes, grants, and constraints, will not be created.

Note: When importing into existing tables, if no column in the table is uniquely indexed, rows may be duplicated.

Show export file contents only

When this parameter is selected the contents of the export file are displayed and not imported. The SQL statements contained in the export are displayed in the order in which the Import utility will execute them.

Buffer size (leave blank for default)

The size of the buffer, in bytes, through which the data rows are transferred.

BUFFER determines the number of rows in the array inserted by the Import utility. The following formula gives an approximation of the buffer size that inserts a given array of rows:

buffer_size = rows_in_array * maximum_row_size

For tables containing LONG, LOB, BFILE, REF, ROWID, UROWID, or DATE columns, rows are inserted individually.

The size of the buffer must be large enough to contain the entire row, except for LOB and LONG columns. If the buffer cannot hold the longest row in a table, the Import utility attempts to allocate a larger buffer.

Note: See your Oracle operating system-specific documentation to determine the default value for this parameter.

Record Length

The length, in bytes, of the file record.

The RECORDLENGTH parameter is necessary when you must transfer the export file to another operating system that uses a different default value.

If you do not define this parameter, it defaults to your platform-dependent value for BUFSIZ. For more information about the BUFSIZ default value, see your Oracle operating system-specific documentation.

You can set RECORDLENGTH to any value equal to or greater than your system's BUFSIZ. (The highest value is 64 KB.)

Changing the RECORDLENGTH parameter affects only the size of data that accumulates before writing to the database. It does not affect the operating system file block size.

You can also use this parameter to specify the size of the Import I/O buffer.

Note: Note: See your Oracle operating system-specific documentation to determine the proper value or how to create a file with a different record size.

Provide a feedback dot each time n rows are exported

Displays a period each time the number of specified rows has been imported.

For example, if you specify 10, Import displays a period each time 10 rows have been imported.

Note: The FEEDBACK value applies to all tables being imported; it cannot be set on a per-table basis.

Specify files

Field Description

Dump file name

The name of the export file to import.

The default file extension is .dmp. This field is mandatory.

Parameter file name (.dat)

The name of the file that contains the list of import parameters.

This field is mandatory.

Log file name (.log)

The name of the log file.

All informational and error messages are written to the log file (if specified).

 

Results (3)

When execution is complete there are three tabs in the Import Tables window. The results of the import are shown on the Output tab. The Log and Parameter file tabs show the contents of their respective files.

 

Related Topics

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