Start Access table updating time stamp

Access table updating time stamp

To delete the data that is currently in a table, you use the DELETE statement, which is commonly referred to as a delete query. The DELETE statement can remove one or more records from a table and generally takes this form: The DELETE statement does not remove the table structure—only the data that is currently being held by the table structure.

In both cases, you use the SQL statement INSERT INTO to accomplish the task.

INSERT INTO statements are commonly referred to as append queries.

Check out all our database development sessions at OOW19 BANNER -------------------------------------------------------------------------------- Oracle Database 11g Release - 64bit Production PL/SQL Release - Production CORE Production TNS for Linux: Version - Production NLSRTL Version - Production For conflict resolution, I added a timestamp column to these tables.

What is the most efficient way to update each row with the current timestamp with the least period of locking on the tables and possibly archive log generation and also commit every 10,000 rows?

When you are inserting records from another table, each value being inserted must be compatible with the type of field that will be receiving the data.

The following INSERT INTO statement inserts all the values in the Customer ID, Last Name, and First Name fields from the tbl Old Customers table into the corresponding fields in the tbl Customers table.

p=1:0:::: P11_QUESTION_ID:2575782100346318728 You could drop the new columns and add them back again.

But dropping columns generates lots of redo and has locking implications.

SET SERVEROUTPUT ON SIZE UNLIMITED DECLARE table_own VARCHAR2 (30); table_name VARCHAR2 (30); l_time TIMESTAMP := SYSTIMESTAMP; sqlstmt VARCHAR2 (1000); CURSOR table_cur IS SELECT a.owner, a.table_name FROM dba_tables a, dba_segments b WHERE a. SEGMENT_NAME AND a.owner = b.owner AND a.owner NOT IN ('ANONYMOUS', 'APEX_030200', 'APEX_PUBLIC_USER', 'APPQOSSYS', 'CTXSYS', 'DBSNMP', 'DIP', 'EXFSYS', 'FLOWS_FILES', 'MDSYS', 'ORACLE_OCM', 'ORDDATA', 'ORDPLUGINS', 'ORDSYS', 'OUTLN', 'MDDATA', 'MGMT_VIEW', 'OLAPSYS', 'OWBSYS', 'OWBSYS_AUDIT', 'SPATIAL_CSW_ADMIN_USR', 'SPATIAL_WFS_ADMIN_USR', 'SI_INFORMTN_SCHEMA', 'SYS', 'SYSTEM', 'WMSYS', 'XDB', 'XS$NULL', 'SYSMAN', 'OLAPSYS') AND (a.owner, a.table_name) NOT IN (SELECT owner, table_name FROM dba_tab_columns WHERE column_name = 'LAST_DML_TIME' AND NUM_NULLS IS NOT NULL) ORDER BY b.bytes / 1024 / 1024 / 1024 DESC; BEGIN OPEN table_cur; LOOP FETCH table_cur INTO table_own, table_name; EXIT WHEN table_cur%NOTFOUND; sqlstmt := 'update ' || table_own || '.' || table_name || ' set last_dml_time = ''' || l_time || ''''; EXECUTE IMMEDIATE sqlstmt; i := i 1; IF MOD (i, 10000) = 0 THEN COMMIT; END IF; END LOOP; CLOSE table_cur; END; / You've already missed the fastest way: Add the column as not null with a default of sysdate!

This is an "instant" operation as of 11g:

To modify the data that is currently in a table, you use the UPDATE statement, which is commonly referred to as an update query.