## IMPORT SCHEMA

You can use the IMPORT SCHEMA command to import the data belonging to the application of the specified schema.

### Prerequisites

You require the TESTDB demo database. Create the database user MONA if not set up already. Create the HOTEL schema as user MONA if it does not already exist.

You have exported the required data using the EXPORT SCHEMA Command.

Only the owner of the schema may execute the IMPORT SCHEMA command. Start the Loader as database administrator MONA and log on to the demo database TESTDB. Use the session mode.

loadercli –d testdb –u mona,red –s hotel

### Examples

The data from the HOTEL schema is to be imported into the TESTDB database.

You can make entries after the keyword CATALOG and/or DATA to select what is to be imported, the database catalog and/or the data belonging to the application.

If you import a table, the Loader also creates all the objects and links (views, foreign key dependencies with other tables…) that are defined for the table. If the necessary objects are not present and the import therefore cannot be executed, the Loader notifies you of the fact. Typical error messages include: -25451 and -25392. If these errors occur, the import is terminated at this point.

#### Importing the Database Catalog of a Schema

You can import the database catalog information belonging to the application of the schema.

IMPORT SCHEMA hotel
CATALOG INSTREAM 'hotel_ddl.catalog'

The database catalog (CATALOG) is imported in the DDL format (default value).

See also:

Loader, Data Stream

#### Importing the Application Data of a Schema

You can import the application data of the schema.

IMPORT SCHEMA hotel
DATA INSTREAM 'hotel_pages.data'

The application data (DATA) is imported in the PAGES format (default value).

IMPORT SCHEMA hotel
DATA INSTREAM 'hotel_records.data' RECORDS

The application data (DATA) is imported in the RECORDS format.

A PAGES import uses a database format (based on a page) and does not write log entries, so it is faster than an import that uses the RECORDS format of the Loader. However, the tables imported in the PAGES format are write-protected until you back up the data.

See also:

Loader, PAGES, RECORDS

#### Importing the Database Catalog and the Application Data of a Schema

You can import the data belonging to the application of a schema.

IMPORT SCHEMA hotel
CATALOG INSTREAM 'hotel_ddl.catalog'
DATA INSTREAM 'hotel_pages.data'

Observe the sequence of the syntax elements. Always enter the syntax element for the import of the database catalog first, and then the syntax element for the import of the application data.

#### Excluding Tables from the Import

By specifying a data stream after the keyword CONFIGURATION, you can exclude the application data of selected tables that are specified in this data stream. The tables must be identified in the data stream by specifying their schema and the table name.

Test the Loader behavior for different tables. When you exclude tables, you must be careful not to violate any dependencies, such as by excluding the tables CITY or HOTEL.

You want to exclude the EMPLOYEE table from the import. Create the employee.configuration file with the following contents:

HOTEL,EMPLOYEE

Specify the following import command in the Loader session mode. Observe the sequence of the syntax elements. First, enter the syntax element that excludes the table from the import.

IMPORT SCHEMA hotel
CONFIGURATION INSTREAM'employee.configuration'
CATALOG INSTREAM 'hotel_ddl.catalog'
DATA INSTREAM 'hotel_pages.data'

The database catalog entries of all tables are always imported, regardless of the restrictions made in employee.configuration.

#### Additional Log Functions

If you specify a data stream after the keyword PACKAGE, the command entries from the SYSLOADER.TRANSFORMATIONMODEL table are exported to this data stream. This is an additional log option. Always enter the PACKAGE syntax element as the last syntax element.

IMPORT SCHEMA hotel
CATALOG INSTREAM 'hotel_ddl.catalog'
PACKAGE OUTSTREAM 'hotel_csv.package'

See also:

Loader, Additional Log Functions (package_spec)

### Complete Syntax of the IMPORT SCHEMA Command

Combining the syntax options can result in correspondingly complex commands. Observe the sequence of the syntax elements.

IMPORT SCHEMA hotel
CONFIGURATION INSTREAM FILE 'employee.configuration' CSV ASCII
CATALOG INSTREAM FILE 'hotel_ddl.catalog' DDL
DATA INSTREAM FILE 'hotel_pages.data' PAGES
PACKAGE OUTSTREAM FILE 'hotel_csv.package' CSV

For a complete syntax description, see IMPORT SCHEMA Command in the Loader documentation.

See also:

Other commands for Importing