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This commit is contained in:
Grzegorz Michalski
2026-02-02 10:59:29 +01:00
commit ecd833f682
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MARS_Packages/REL01/MARS-1096/rollback_mars1096.sql Normal file
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-- ===================================================================
-- MARS-1096 ROLLBACK SCRIPT: Revert A_PROCESS_LOG Changes
-- ===================================================================
-- Purpose: Rollback all changes from MARS-1096 installation
-- - Revert log_message column from VARCHAR2(20000) to VARCHAR2(4000)
-- - Remove daily interval partitioning (restore to non-partitioned table)
-- - Preserve all existing data during rollback
-- Author: Grzegorz Michalski
-- Date: 2025-12-03
-- Version: 1.0.0
-- ===================================================================
-- Dynamic spool file generation (using SYS_CONTEXT - no DBA privileges required)
var filename VARCHAR2(100)
BEGIN
:filename := 'ROLLBACK_MARS_1096_' || SYS_CONTEXT('USERENV', 'CON_NAME') || '_' || TO_CHAR(SYSDATE,'YYYYMMDD_HH24MISS') || '.log';
END;
/
column filename new_value _filename
select :filename filename from dual;
spool &_filename
SET ECHO OFF
SET TIMING ON
SET SERVEROUTPUT ON SIZE UNLIMITED
SET PAUSE OFF
PROMPT =========================================================================
PROMPT MARS-1096: Rollback A_PROCESS_LOG Changes
PROMPT =========================================================================
PROMPT WARNING: This will reverse all changes from MARS-1096 installation!
PROMPT
PROMPT Changes to be reverted:
PROMPT - Revert log_message column: VARCHAR2(20000) -> VARCHAR2(4000)
PROMPT - Remove daily interval partitioning
PROMPT - Restore to non-partitioned table structure
PROMPT
PROMPT CRITICAL: All existing data will be preserved during rollback
PROMPT =========================================================================
-- Confirm rollback with user
ACCEPT continue CHAR PROMPT 'Type YES to continue with rollback, or Ctrl+C to abort: '
WHENEVER SQLERROR EXIT SQL.SQLCODE
BEGIN
IF '&continue' IS NULL OR TRIM('&continue') IS NULL OR UPPER(TRIM('&continue')) != 'YES' THEN
RAISE_APPLICATION_ERROR(-20001, 'Rollback aborted by user');
END IF;
END;
/
WHENEVER SQLERROR CONTINUE
PROMPT
PROMPT =========================================================================
PROMPT Step 1: Rollback Table Structure
PROMPT =========================================================================
DECLARE
v_row_count NUMBER := 0;
v_table_exists NUMBER := 0;
BEGIN
-- Check if old backup table still exists
SELECT COUNT(*) INTO v_table_exists
FROM user_tables
WHERE table_name = 'A_PROCESS_LOG_OLD';
IF v_table_exists > 0 THEN
-- If backup exists, simply restore it
DBMS_OUTPUT.PUT_LINE('Restoring from backup table A_PROCESS_LOG_OLD');
EXECUTE IMMEDIATE 'ALTER TABLE CT_MRDS.A_PROCESS_LOG RENAME TO A_PROCESS_LOG_PARTITIONED';
EXECUTE IMMEDIATE 'ALTER TABLE CT_MRDS.A_PROCESS_LOG_OLD RENAME TO A_PROCESS_LOG';
-- Revert column size
EXECUTE IMMEDIATE 'ALTER TABLE CT_MRDS.A_PROCESS_LOG MODIFY (log_message VARCHAR2(4000))';
EXECUTE IMMEDIATE 'DROP TABLE CT_MRDS.A_PROCESS_LOG_PARTITIONED PURGE';
DBMS_OUTPUT.PUT_LINE('Rollback complete using backup table.');
ELSE
-- No backup, need to convert back manually
DBMS_OUTPUT.PUT_LINE('No backup found. Converting partitioned table to non-partitioned.');
EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM CT_MRDS.A_PROCESS_LOG' INTO v_row_count;
DBMS_OUTPUT.PUT_LINE('Records to migrate: ' || v_row_count);
-- Create non-partitioned table
EXECUTE IMMEDIATE q'[CREATE TABLE CT_MRDS.A_PROCESS_LOG_NP (
a_process_log_key NUMBER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
guid VARCHAR2(32),
Username VARCHAR2(128),
Osuser VARCHAR2(128),
Machine VARCHAR2(64),
Module VARCHAR2(64),
process_name VARCHAR2(200),
procedure_name VARCHAR2(200),
procedure_parameters VARCHAR2(20000),
log_level VARCHAR2(10),
log_message VARCHAR2(4000),
log_timestamp TIMESTAMP DEFAULT SYSTIMESTAMP
)]';
-- Copy all data
EXECUTE IMMEDIATE 'INSERT /*+ APPEND */ INTO CT_MRDS.A_PROCESS_LOG_NP (
guid, Username, Osuser, Machine, Module, process_name, procedure_name,
procedure_parameters, log_level, log_message, log_timestamp
) SELECT guid, Username, Osuser, Machine, Module, process_name, procedure_name,
procedure_parameters, log_level, log_message, log_timestamp
FROM CT_MRDS.A_PROCESS_LOG';
COMMIT;
-- Swap tables
EXECUTE IMMEDIATE 'ALTER TABLE CT_MRDS.A_PROCESS_LOG RENAME TO A_PROCESS_LOG_PARTITIONED';
EXECUTE IMMEDIATE 'ALTER TABLE CT_MRDS.A_PROCESS_LOG_NP RENAME TO A_PROCESS_LOG';
EXECUTE IMMEDIATE 'DROP TABLE CT_MRDS.A_PROCESS_LOG_PARTITIONED PURGE';
DBMS_OUTPUT.PUT_LINE('Rollback complete.');
END IF;
END;
/
PROMPT
PROMPT =========================================================================
PROMPT Step 2: Verify Rollback
PROMPT =========================================================================
-- Verify column size reverted
SELECT column_name, data_type, data_length
FROM user_tab_columns
WHERE table_name = 'A_PROCESS_LOG' AND column_name = 'LOG_MESSAGE';
-- Verify partitioning removed
SELECT COUNT(*) AS partition_count
FROM user_tab_partitions
WHERE table_name = 'A_PROCESS_LOG';
-- Verify record count preserved
SELECT COUNT(*) AS total_records FROM CT_MRDS.A_PROCESS_LOG;
PROMPT
PROMPT =========================================================================
PROMPT MARS-1096 Rollback - COMPLETED
PROMPT =========================================================================
PROMPT Check the log file for complete rollback details.
PROMPT Expected results:
PROMPT - LOG_MESSAGE column: VARCHAR2(4000)
PROMPT - Partition count: 0 (non-partitioned)
PROMPT - Total records: Should match pre-rollback count
PROMPT =========================================================================
spool off
quit;