Display all Oracle Schemas Name
How to Display all Oracle Schemas, Oracle Database 19c, In Oracle Database 19c, Displaying All Schemas Can Be A Useful Task For Various Purposes, Such As Auditing, Monitoring, Or Understanding The Overall Database Structure. By Obtaining A Comprehensive List Of Schemas, You Gain Insights Into The Organization And Hierarchy Of Your Oracle Database. In This Article, We Will Explore Various Methods To Display All Oracle Schemas In Oracle Database 19c. We Will Cover Different Approaches, Including Sql Queries, System Views, And Command-line Utilities. So, Let's Dive In And Discover How To Accomplish This Task Effectively.
How to Display all Oracle Schemas, Oracle Database 19c: Using SQL Queries
To retrieve a list of all schemas in Oracle Database 19c using SQL queries,
you can utilize the power of the DBA_USERSview. This view contains valuable information about all users and schemas in the database. Here's an example query to display all Oracle schemas:
SELECT username FROM dba_users;
Executing this query will provide you with a result set containing the names of all schemas in your Oracle Database 19c instance. You can further enhance this query by adding additional columns from the DBA_USERSview to retrieve more details about each schema,
such as the creation date,
default tablespace,
and more.
Some More Examples And Sql Code Are Given Below
/* Formatted on 7/15/2023 12:48:09 AM (QP5 v5.391) */
SELECT DISTINCT OWNER,
SEGMENT_NAME,
PARTITION_NAME,
TABLESPACE_NAME,
CELLMEMORY FROM dba_segmentsExecuting this query will give you a list of all segments that the current user has access to. If you have sufficient privileges,
you can also use the DBA_USERS view mentioned earlier to retrieve a comprehensive list of all segments in the database.
OR
/* Formatted on 7/15/2023 12:48:09 AM (QP5 v5.391) */
SELECT DISTINCT OWNER,
SEGMENT_NAME,
PARTITION_NAME,
TABLESPACE_NAME,
CELLMEMORY FROM dba_segments WHERE owner IN (SELECT username FROM dba_users WHERE default_tablespace NOT IN ('SYSTEM', 'SYSAUX'));
OR
/* Formatted on 7/15/2023 12:54:15 AM (QP5 v5.391) */
SELECT DISTINCT owner FROM dba_segments WHERE owner NOT IN ('SYSTEM',
'XDB',
'SYS',
'TSMSYS',
'MDSYS',
'EXFSYS',
'WMSYS',
'ORDSYS',
'OUTLN',
'DBSNMP');
How to Display all Oracle Schemas, Oracle Database 19c: Using System Views
Another way to obtain a list of all schemas in Oracle Database 19c is by utilizing system views specifically designed to provide metadata information about the database objects. The ALL_USERSview is one such view that contains details about all users accessible to the current user. Here's an example query using the ALL_USERS view to display all Oracle schemas:
SELECT username FROM all_users;
Executing this query will give you a list of all schemas that the current user has access to. If you have sufficient privileges,
you can also use the DBA_USERSview mentioned earlier to retrieve a comprehensive list of all schemas in the database.
How to Display all Oracle Schemas, Oracle Database 19c: Using Command-Line Utilities
Oracle Database 19c provides command-line utilities that can assist in displaying all schemas efficiently. One such utility is SQLPlus, a powerful command-line interface for Oracle Database. Here's an example of how to use SQLPlus to obtain a list of all Oracle schemas:
- Open a terminal or command prompt.
- Launch SQL*Plus by entering the following command:
sqlplus / as sysdbaOnce connected, execute the following SQL query:
SELECT username FROM dba_users;
SQL*Plus will display the list of all schemas in the database.
Using SQL*Plus provides a convenient way to interact with the database directly from the command line and retrieve the desired information promptly.
FAQs (Frequently Asked Questions)
To find the number of objects within each schema, you can execute the following SQL query:
SELECT owner,
COUNT(*) as object_count FROM all_objects GROUP BY owner;
This query will return a result set with the schema owner and the corresponding object count.
Yes, you can display only active schemas by querying the DBA_USERS view with an additional condition. Here's an example query:
SELECT username FROM dba_users WHERE account_status='OPEN';
This query will retrieve a list of all active schemas in your Oracle Database 19c.
Yes, there are several graphical tools available that provide visual representations of Oracle schemas. Some popular tools include Oracle SQL Developer, Toad for Oracle, and PL/SQL Developer. These tools offer user-friendly interfaces with diagrams and visualizations to help you explore and understand your Oracle schemas more intuitively.
Yes, you can display schemas from a remote Oracle Database 19c instance by establishing a database link between the local and remote databases. Once the database link is established, you can execute the necessary queries or commands to retrieve the schema information from the remote instance.
Yes, you can export the list of schemas to a file by using command-line utilities like SQLPlus or by executing a query and spooling the result to a file. Here's an example of how to achieve this using SQLPlus:
Launch SQL*Plus and connect to the database.
Execute the following SQL statements:
SET PAGESIZE 0 SET FEEDBACK OFF SET HEADING OFF SPOOL schema_list.txt SELECT username FROM dba_users;
SPOOL OFFThis will save the list of schemas to the file schema_list.txt in the current directory.
To determine the default tablespace for each schema, you can execute the following SQL query:
SELECT username,
default_tablespace FROM dba_users;
This query will retrieve the schema name along with its corresponding default tablespace.
Conclusion
Displaying all Oracle schemas in Oracle Database 19c is an essential task for understanding the database structure and organization. In this article, we explored different methods to accomplish this task using SQL queries, system views, and command-line utilities like SQL*Plus. We also answered some frequently asked questions related to displaying schemas in Oracle Database 19c. By following these approaches, you can easily obtain the necessary information about the schemas in your Oracle database.
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