Finding sequences and triggers associated with an Oracle table

Question

I have used this query to fetch the list of sequences belonging to an Oracle database user:

SELECT * FROM all_sequences x,all_tables B
WHERE x.sequence_owner         


        

Answer 1

One way would be to run these queries to check if there are any sequence's Pseudocolumns (NEXTVAL and CURRVAL ) used in your functions , procedures, packages, Triggers or PL/SQL JAVA SOURCE.

select * from user_source where 
         UPPER(TEXT) LIKE '%NEXTVAL%';   

select * from all_source where 
         UPPER(TEXT) LIKE '%NEXTVAL%';  

Then go to the specific Procedure, Function or Trigger to check which column/table gets populated by a sequence. The query could also be used with '%CURRVAL%'

This might not help if you are running inserts from JDBC or other external applications using a sequence.

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Oracle 12c introduced the IDENTITY columns, using which you could create a table with an identity column, which is generated by default.

CREATE TABLE t1 (c1 NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY, 
                   c2 VARCHAR2(10));

This will internally create a sequence that auto-generates the value for the table's column.So, If you would like to know which sequence generates the value for which table, you may query the all_tab_columns

SELECT data_default AS sequence_val
    ,table_name
    ,column_name
FROM all_tab_columns
WHERE OWNER = 'HR'
    AND identity_column = 'YES';

SEQUENCE_VAL                             |TABLE_NAME               |COLUMN_NAME
-----------------------------------------|-------------------------------------
"HR"."ISEQ$$_78160".nextval              |T1                       |C1