How to back up the table structure of oracle database

To back up the structure of an Oracle database table, you can use the CREATE TABLE statement همراه با EXPLAIN clause. The specific steps include: 1. Open Oracle SQL*Plus; 2. Create a file to store the DDL output; 3. Generate the CREATE TABLE statement for the table; 4. Capture the EXPLAIN PLAN output; 5. End the export; 6. Store the DDL. The generated DDL file will contain the complete structure information of the table.

Oracle database table structure backup method

How to back up the Oracle database table structure?

Answer: To back up the structure of a table in an Oracle database, you can use the CREATE TABLE statement همراه با EXPLAIN clause.

Detailed steps:

1. Open Oracle SQL*Plus

Open the Oracle SQL*Plus session and connect to The database of tables to be backed up.

2. Create a file to store the DDL output

Use the following command to create a text file to store the structure of the table:

<code class="sql">SPOOL table_structure.ddl</code>

3. Generate the CREATE TABLE statement of the table

Use the EXPLAIN PLAN clause to execute the CREATE TABLE statement, as shown below:

<code class="sql">EXPLAIN PLAN SET STATEMENT_ID = 'MY_EXPLAIN_PLAN'
FOR
CREATE TABLE table_name AS
SELECT * FROM original_table;</code>

4. Capture EXPLAIN PLAN output

This will generate an execution plan that contains the structure information of the table. Capture this output using the following command:

<code class="sql">SET LONG 1000000
SELECT LPAD(' ', 20) || DBMS_XPLAN.DISPLAY_CURSOR('MY_EXPLAIN_PLAN')
FROM DUAL;</code>

5. End the export

After completing the export, end the export using the following command:

<code class="sql">SPOOL OFF</code>

6. The table_structure.ddl

will contain the complete structure of the table, including column definitions, primary keys, and foreign key constraints.

Example:

To back up the structure of a table named customers, follow these steps:

1. Open SQL*Plus and connect to the database.
2. Create a text file named customers_structure.ddl.
3. Execute the following command:

<code class="sql">SPOOL customers_structure.ddl
EXPLAIN PLAN SET STATEMENT_ID = 'MY_EXPLAIN_PLAN'
FOR
CREATE TABLE customers AS
SELECT * FROM original_customers;
SET LONG 1000000
SELECT LPAD(' ', 20) || DBMS_XPLAN.DISPLAY_CURSOR('MY_EXPLAIN_PLAN')
FROM DUAL;
SPOOL OFF</code>

Now, the customers_structure.ddl file will contain the complete structure of the customers table.

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