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How to Get All the Sequences Grant Ddl For the Schema In Oracle?

7 minutes read

To get all the sequence grant DDL for a schema in Oracle, you can query the DBA_TAB_PRIVS view to retrieve information about privileges granted on all objects in the database. By filtering on the GRANTEE column for the specific schema and the TABLE_NAME column for sequences, you can generate the necessary grant statements for each sequence in the schema. This will include the SELECT, UPDATE, INSERT, and DELETE privileges granted on the sequences. You can then use this information to reconstruct the grant DDL statements for all sequences in the schema.


How to track changes made to DDL for sequences in Oracle schema?

To track changes made to DDL for sequences in an Oracle schema, you can use the following methods:

  1. Enable auditing: Enable auditing for DDL changes in the Oracle database. You can set up auditing on the DDL commands for sequences using the following SQL commands: Enable system-wide auditing: AUDIT ALL ON sequence BY ACCESS; Enable auditing at the schema level: AUDIT ALL ON sequence BY ACCESS WHENEVER SUCCESSFUL;
  2. Query DBA_AUDIT_OBJECT to view the audited DDL changes on sequences: SELECT * FROM DBA_AUDIT_OBJECT WHERE OBJECT_NAME = 'SEQUENCE_NAME';
  3. Use Oracle Flashback: Oracle Flashback technology allows you to view the historical changes made to objects in the database, including sequences. You can query the FLASHBACK_TRANSACTION_QUERY view to retrieve the history of changes to sequences: SELECT * FROM FLASHBACK_TRANSACTION_QUERY WHERE OPERATION = 'ALTER SEQUENCE' AND TABLE_NAME = 'SEQUENCE_NAME';
  4. Monitor the database using log mining: You can enable LogMiner to read and analyze the redo logs to track changes made to objects, including sequences. This method requires setting up LogMiner on the Oracle database and querying the V$LOGMNR_CONTENT view to view the DDL changes.


By using these methods, you can effectively track and monitor changes made to sequences in an Oracle schema.


What is the impact of modifying DDL for sequences in Oracle schema?

Modifying DDL (Data Definition Language) for sequences in an Oracle schema can have several impacts:

  1. Change in Sequence Values: Modifying the DDL for a sequence can change the values that the sequence generates. For example, changing the starting value or increment value of a sequence can result in different values being generated when the sequence is next used.
  2. Impact on Existing Data: If the DDL modification for a sequence is not carefully planned, it can potentially impact existing data that is relying on the sequence values. This can lead to inconsistency and data integrity issues within the database.
  3. Performance Impact: Changing the DDL of a sequence can impact the performance of the database. For example, modifying the cache size of a sequence can impact the speed at which new sequence values are generated.
  4. Application Dependencies: Modifying the DDL for a sequence can have implications on any applications that are using the sequence. It is important to ensure that all applications are updated to accommodate any changes made to the sequence.
  5. Data Corruption: If the DDL modification is not done correctly, it can potentially result in data corruption within the database. It is important to thoroughly test any changes made to sequences before implementing them in a production environment.


What is the importance of documenting DDL for sequences in Oracle?

Documenting DDL for sequences in Oracle is important for several reasons:

  1. Documentation helps in understanding the purpose and usage of the sequence. It provides information about the sequence name, its purpose, the columns that use the sequence, and any specific details related to the sequence.
  2. It serves as a reference for future development and maintenance tasks. When developers or database administrators need to make changes or troubleshoot issues related to the sequence, having proper documentation can save time and effort.
  3. Documentation helps in maintaining data integrity and consistency. By documenting the DDL for sequences, it becomes easier to ensure that sequences are used correctly and consistently across the database.
  4. It helps in tracking changes made to the sequence over time. By documenting the DDL statements used to create or modify the sequence, it becomes easier to track the history of changes and understand how the sequence has evolved.
  5. Documentation provides a valuable resource for new team members who might not be familiar with the database structure. It serves as a guide for understanding the sequences and their role in the database.


Overall, documenting DDL for sequences in Oracle is important for ensuring clarity, consistency, and maintainability of the database. It helps in effective database management and promotes a better understanding of the database structure.


How to extract DDL for all sequences using SQL in Oracle?

To extract the DDL for all sequences in Oracle, you can use the following query:

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SELECT 'CREATE SEQUENCE ' || sequence_name || ' ' ||
        'START WITH ' || to_char(min_value) || ' ' ||
        'INCREMENT BY ' || to_char(increment_by) || ' ' ||
        'MINVALUE ' || to_char(min_value) || ' ' ||
        'MAXVALUE ' || to_char(max_value) || ' ' ||
        'CYCLE ' || case cycle_flag when 'Y' then 'YES' else 'NO' end || ' ' ||
        'CACHE ' || to_char(cache_size) || ';' as ddl
FROM user_sequences;


This query selects the DDL statement for each sequence in the current user's schema from the user_sequences data dictionary view. It concatenates the necessary sequence attributes to form the complete DDL statement for each sequence.


You can run this query in SQL*Plus or any SQL query tool connected to your Oracle database to get the DDL for all sequences defined in the current schema.


How to analyze the DDL script for all sequences in Oracle?

To analyze the DDL script for all sequences in Oracle, you can follow these steps:

  1. Open the DDL script in a text editor or SQL development tool.
  2. Look for the CREATE SEQUENCE statements in the script. These statements define the sequences in the database.
  3. Analyze the properties and attributes specified in each CREATE SEQUENCE statement, including: Sequence name: The name of the sequence. Start value: The initial value of the sequence. Increment by: The amount by which the sequence value is incremented. Min value: The minimum value of the sequence. Max value: The maximum value of the sequence. Cycle/Nocycle: Whether the sequence should cycle back to its initial value after reaching its maximum value. Cache/Nocache: Whether sequence numbers should be pre-allocated and stored in memory for faster access. Order/Noorder: Whether the sequence numbers should be generated in the order they were requested.
  4. Check for any dependencies or references to the sequences in other objects, such as tables or views. Make sure that these dependencies are correctly defined and maintained.
  5. Verify that the DDL script includes proper error handling and exception handling for sequences to prevent any issues with sequence generation.
  6. Consider the performance implications of the sequence settings, such as the cache size and increment by value, and adjust them as needed based on the workload and usage patterns of the sequences.
  7. Finally, test the DDL script by running it in a test environment and verifying that the sequences are created successfully and functioning as expected.


By following these steps, you can effectively analyze the DDL script for all sequences in Oracle and ensure that the sequences are properly defined and managed in the database.


How to optimize the generation of DDL for sequences in Oracle schema?

  1. Use a naming convention for sequences that is consistent and easy to identify.
  2. Group sequences that are related to the same entity or process together and include comments to indicate their purpose.
  3. Use a template or code generation tool to create standardized DDL for sequences, which can help ensure consistency and avoid errors.
  4. Consider setting the CACHE value for sequences to improve performance by reducing disk I/O.
  5. Use the NOCACHE option for sequences that are not heavily used to conserve memory.
  6. Consider setting the INCREMENT BY value to a higher value if the sequence will be used to generate a large number of values quickly.
  7. Use the START WITH option to define the initial value for a sequence, which can help avoid gaps in the generated values.
  8. Review and optimize the permissions and privileges granted on sequences to ensure they are secure and adhere to the principle of least privilege.
  9. Regularly review and update the DDL for sequences as needed, such as when the requirements or usage of the sequences change.
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