-- ===================================================================
-- MARS-1096 INSTALL SCRIPT: Extend A_PROCESS_LOG and Enable Partitioning
-- ===================================================================
-- Purpose: 
-- - Extend log_message column from VARCHAR2(4000) to VARCHAR2(20000)
-- - Convert table to daily interval partitioning on log_timestamp
-- - Preserve all existing data during conversion
-- 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 := 'INSTALL_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: Extend A_PROCESS_LOG and Enable Daily Partitioning
PROMPT =========================================================================
PROMPT 
PROMPT This script will:
PROMPT - Extend log_message column from VARCHAR2(4000) to VARCHAR2(20000)
PROMPT - Convert A_PROCESS_LOG table to daily interval partitioning
PROMPT - Create backup table A_PROCESS_LOG_OLD during conversion
PROMPT - Migrate all existing records to partitioned structure
PROMPT - Automatically cleanup backup table after verification
PROMPT 
PROMPT Expected Duration: 1-2 minutes (depends on data volume)
PROMPT =========================================================================

-- Confirm installation with user
ACCEPT continue CHAR PROMPT 'Type YES to continue with installation, 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, 'Installation aborted by user');
    END IF;
END;
/
WHENEVER SQLERROR CONTINUE

PROMPT 
PROMPT =========================================================================
PROMPT Step 1: Extend Column and Enable Partitioning
PROMPT =========================================================================
@@02_MARS_1096_extend_and_partition.sql

PROMPT 
PROMPT =========================================================================
PROMPT Step 2: Verify Partitioning
PROMPT =========================================================================
@@04_MARS_1096_verify_partitioning.sql

PROMPT 
PROMPT =========================================================================
PROMPT Step 3: Cleanup Backup Table
PROMPT =========================================================================
@@05_MARS_1096_cleanup_backup.sql

PROMPT 
PROMPT =========================================================================
PROMPT MARS-1096 Installation - COMPLETED
PROMPT =========================================================================
PROMPT Check the log file for complete installation details.
PROMPT =========================================================================

spool off
quit;
