How to use the DBMS_METADATA Package In SQL

Here we will demonstrate how to use the DBMS_METADATA package to extract metadata definitions of database objects. We’ll customize the metadata extraction process to suit our requirements.

Syntax:

SELECT DBMS_METADATA.GET_DDL('object_type', 'object_name') FROM DUAL;

Example:

SELECT DBMS_METADATA.GET_DDL('TABLE', 'EMPLOYEES') FROM DUAL;

Output:

The output of the SELECT query is the DDL statement for the specified database object (EMPLOYEES table).

Export schema without data in PL/SQL Using the DBMS_METADATA Package

Explanation: In this example, we’re using the DBMS_METADATA.GET_DDL function to retrieve the Data Definition Language (DDL) for the EMPLOYEES table.

How to Export Schema Without Data in PL/SQL?

In Databases, sometimes you need to export database objects like tables, views, and procedures. You might do this for different reasons like making backups, moving data to a new place, or it with someone else. There are different ways to do this.

In this article, we will learn about How to clone a schema without data by understanding various methods along with the examples and so on.

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How to Export Only Schema Structure in Oracle?

Exporting schema without data in PL/SQL is like having a snapshot of how our database is organized, without including the actual information. It’s useful for making blueprints of our database for things like documentation or setting up the same structures in different places....

1. Exporting Schema with Data Pump

We will export the SYSTEM schema from XE database using utility “expdp”. We provide login credentials (username: SYSTEM, password: 1234) and specify the database identifier (XE) for connection. The export dump file will be stored in the directory (DATA_PUMP_DIR) with the name “expotingSchema.dmp”. Only objects which belongs to the SYSTEM schema will be exported....

2. Using the DBMS_METADATA Package

Here we will demonstrate how to use the DBMS_METADATA package to extract metadata definitions of database objects. We’ll customize the metadata extraction process to suit our requirements....

3. Using SQL Queries

Here we will utilize SQL Queries to directly extract schema object definitions from Oracle’s data dictionary views....

Conclusion

In this article, we explored three different methods for exporting schema objects in Oracle databases: Data Pump, DBMS_METADATA Package, and SQL Queries. Each method offers its own advantages and use cases, depending on the specific requirements of the task at hand. By understanding these methods, you can choose the most appropriate approach for your database export as per needs....