How can I check the time when table data was modified in Oracle?

To view the modification time of table data, you can follow these steps:

1. Utilize Oracle’s Flashback Query feature to view table data at a specific point in time by including AS OF TIMESTAMP or AS OF SCN clauses in your query. For example:

SELECT * FROM your_table_name AS OF TIMESTAMP TO_TIMESTAMP('2022-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS');

This will display table data that was modified before January 1, 2022, 00:00:00.

1. You can use system views in Oracle to see the modification time of a table. You can query the ALL_TAB_MODIFICATIONS view to see the table modification logs. For example:

SELECT * FROM ALL_TAB_MODIFICATIONS WHERE TABLE_NAME = 'your_table_name';

This will display the modification history of the table, including the modification time and type of operation.

1. Utilize Oracle’s logging feature to view the modification time of a table. Enable logging for the table and use the LOGMNR tool to query the table’s modification records. For example:

SELECT SCN, TIMESTAMP FROM V$LOGMNR_CONTENTS WHERE SEG_NAME = 'your_table_name';

This will display the modification history of the table, including the modification time and SCN number.

By using the above methods, you can view the modification time of table data and understand the modification history of the table.