Common Oracle Data Dictionary tables

Common Oracle Data Dictionary tables view the default tablespace of the current user
SQL> select username, default_tablespace from user_users;

View the role of the current user
SQL> select * From user_role_privs;

View the system and table-level permissions of the current user
SQL> select * From user_sys_privs;
SQL> select * From user_tab_privs;

View All tables under a user
SQL> select * From user_tables;

View column attributes of all tables under a user

SQL> select * From user_tab_columns where table_name =: table_name;

Display User Information (tablespace)
Select default_tablespace, temporary_tablespace
From dba_users where username = 'game ';

1. User

View the default tablespace of the current user
SQL> select username, default_tablespace from user_users;

View the role of the current user
SQL> select * From user_role_privs;

View the system and table-level permissions of the current user
SQL> select * From user_sys_privs;
SQL> select * From user_tab_privs;

Displays the permissions of the current session.
SQL> select * From session_privs;

Displays the system permissions of a specified user.
SQL> select * From dba_sys_privs where grantee = 'game ';

Show privileged users
Select * from V $ pwfile_users;

Display User Information (tablespace)
Select default_tablespace, temporary_tablespace
From dba_users where username = 'game ';

Show user profile
Select profile from dba_users where username = 'game ';

2. Tables

View All tables under a user
SQL> select * From user_tables;

View tables whose names contain log characters
SQL> select object_name, object_id from user_objects
Where instr (object_name, 'log')> 0;

View the creation time of a table
SQL> select object_name, created from user_objects where object_name = upper ('& table_name ');

View the size of a table
SQL> select sum (bytes)/(1024*1024) as "size (m)" from user_segments
Where segment_name = upper ('& table_name ');

View the table in the Oracle memory Partition
SQL> select table_name, cache from user_tables where instr (cache, 'y')> 0;

3. Index

View the number and category of Indexes
SQL> select index_name, index_type, table_name from user_indexes order by table_name;

View indexed fields
SQL> select * From user_ind_columns where index_name = upper ('& index_name ');

View index size
SQL> select sum (bytes)/(1024*1024) as "size (m)" from user_segments
Where segment_name = upper ('& index_name ');

4. Serial number

View the serial number. last_number is the current value.
SQL> select * From user_sequences;

5. View

View view name
SQL> select view_name from user_views;

View the SELECT statement for creating a view
SQL> set view_name, text_length from user_views;
SQL> set long 2000; Description: You can set the size of set long based on the text_length value of the view.
SQL> select text from user_views where view_name = upper ('& view_name ');

6. Synonyms

View synonym name
SQL> select * From user_synonyms;

7. Constraints

View the constraints of a table
SQL> select constraint_name, constraint_type, search_condition, r_constraint_name
From user_constraints where table_name = upper ('& table_name ');

SQL> select C. constraint_name, C. constraint_type, CC. column_name
From user_constraints C, user_cons_columns CC
Where C. Owner = upper ('& table_owner') and C. table_name = upper ('& table_name ')
And C. Owner = cc. Owner and C. constraint_name = cc. constraint_name
Order by CC. position;

8. storage functions and processes

View the status of functions and processes
SQL> select object_name, status from user_objects where object_type = 'function ';
SQL> select object_name, status from user_objects where object_type = 'Procedure ';

View functions and processesSource code
SQL> select text from all_source where owner = user and name = upper ('& plsql_name ');