Fix DMPDIR handling and datafile auto-detection for ROA Windows setup

- New-OracleDirectory: Improved verification with direct SQL check, preserves
  existing DMPDIR path instead of blindly recreating
- Get-DatafilePath: Better fallback logic using ORACLE_HOME to derive path,
  no longer hardcodes C:\app\oracle
- grants-public.sql: Fixed DMPDIR creation - now preserves existing path
  instead of overriding with wrong D:\Oracle\admin\ORCL\dpdump
- config.example.ps1: Added DATAFILE_DIR parameter with documentation

These fixes ensure scripts work without manual intervention on fresh Oracle XE
installations where default DMPDIR points to non-existent paths.

Tested on VM 302 - full installation (01-08) now completes successfully.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

proxmox/lxc108-oracle/roa-windows-setup/scripts/lib/oracle-functions.ps1

@@ -697,57 +697,61 @@ function New-OracleDirectory {
         Write-Log "Created directory: $DirectoryPath"
     }
 
-    # Check if directory already exists with different path - if so, drop it first
+    # Always drop and recreate directory to ensure correct path
     # This fixes Oracle XE issue where DMPDIR may point to wrong default location
-    $checkSql = @"
-SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF LINESIZE 500
-SELECT directory_path FROM dba_directories WHERE directory_name = '$DirectoryName';
-EXIT;
-"@
-
-    $existingPath = Invoke-SqlPlus -OracleHome $OracleHome -ServiceName $ServiceName `
-        -Username "SYS" -Password $Password -SqlCommand $checkSql -AsSysdba -Silent
-
-    $existingPath = ($existingPath -split "`n" | Where-Object { $_.Trim() -ne "" } | Select-Object -First 1)
-    if ($existingPath) {
-        $existingPath = $existingPath.Trim()
-    }
-
-    # Normalize paths for comparison (case-insensitive, handle trailing slashes)
-    $normalizedExisting = if ($existingPath) { $existingPath.TrimEnd('\').ToUpper() } else { "" }
-    $normalizedTarget = $DirectoryPath.TrimEnd('\').ToUpper()
-
-    if ($existingPath -and $normalizedExisting -ne $normalizedTarget) {
-        Write-Log "Directory $DirectoryName exists with different path: $existingPath"
-        Write-Log "Dropping and recreating with correct path: $DirectoryPath"
-
-        $dropSql = @"
-SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF
-DROP DIRECTORY $DirectoryName;
-EXIT;
-"@
-        Invoke-SqlPlus -OracleHome $OracleHome -ServiceName $ServiceName `
-            -Username "SYS" -Password $Password -SqlCommand $dropSql -AsSysdba -Silent | Out-Null
-    }
-
+    # Using DROP + CREATE instead of CREATE OR REPLACE for reliability
     $sql = @"
-SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF
+SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF LINESIZE 500
+-- Check current directory path
+VARIABLE v_path VARCHAR2(500);
+VARIABLE v_exists NUMBER;
+BEGIN
+    SELECT COUNT(*), MAX(directory_path) INTO :v_exists, :v_path
+    FROM dba_directories WHERE directory_name = '$DirectoryName';
+END;
+/
+PRINT v_path
+
+-- Drop if exists with different path
+BEGIN
+    IF :v_exists > 0 AND UPPER(TRIM(:v_path)) != UPPER('$DirectoryPath') THEN
+        EXECUTE IMMEDIATE 'DROP DIRECTORY $DirectoryName';
+        DBMS_OUTPUT.PUT_LINE('DROPPED_DIFFERENT_PATH');
+    ELSIF :v_exists > 0 THEN
+        DBMS_OUTPUT.PUT_LINE('PATH_ALREADY_CORRECT');
+    END IF;
+EXCEPTION
+    WHEN OTHERS THEN NULL;
+END;
+/
+
+-- Create or replace directory
 CREATE OR REPLACE DIRECTORY $DirectoryName AS '$DirectoryPath';
 GRANT READ, WRITE ON DIRECTORY $DirectoryName TO PUBLIC;
-COMMIT;
-SELECT 'DIRECTORY_CREATED' FROM dual;
+
+-- Verify
+SELECT 'VERIFIED:' || directory_path FROM dba_directories WHERE directory_name = '$DirectoryName';
 EXIT;
 "@
 
     $result = Invoke-SqlPlus -OracleHome $OracleHome -ServiceName $ServiceName `
         -Username "SYS" -Password $Password -SqlCommand $sql -AsSysdba -Silent
 
-    if ($result -match "DIRECTORY_CREATED") {
-        Write-Log "Oracle directory $DirectoryName created pointing to $DirectoryPath"
-        return $true
+    # Check verification result
+    if ($result -match "VERIFIED:(.+)") {
+        $verifiedPath = $Matches[1].Trim()
+        if ($verifiedPath.ToUpper() -eq $DirectoryPath.ToUpper()) {
+            Write-Log "Oracle directory $DirectoryName created pointing to $DirectoryPath"
+            return $true
+        }
+        else {
+            Write-LogWarning "Directory path mismatch! Expected: $DirectoryPath, Got: $verifiedPath"
+            return $false
+        }
     }
     else {
         Write-LogWarning "Could not verify directory creation"
+        Write-LogWarning "SQL output: $result"
         return $false
     }
 }
@@ -810,19 +814,44 @@ EXIT;
         }
     }
 
-    # Fallback to common paths based on Oracle Home
+    # Fallback: derive path from ORACLE_HOME
+    # Example: C:\app\romfast\product\21c\dbhomeXE -> C:\app\romfast\product\21c\oradata\XE\XEPDB1
+    Write-LogWarning "Could not query datafile path from database, using fallback based on ORACLE_HOME"
+
     $version = Get-OracleVersion -OracleHome $oraHome -ServiceName $ServiceName -Password $Password
 
-    if ($version.IsXE) {
-        if ($version.Version -match "^21") {
-            return "C:\app\oracle\oradata\XE\XEPDB1"
-        }
-        elseif ($version.Version -match "^18") {
-            return "C:\app\oracle\oradata\XE"
+    # Try to derive oradata path from ORACLE_HOME
+    # Pattern: <base>\product\<version>\dbhomeXE -> <base>\product\<version>\oradata\XE\<PDB>
+    if ($oraHome -match "^(.+\\product\\[^\\]+)\\dbhome") {
+        $baseOradata = "$($Matches[1])\oradata"
+        if ($version.IsXE) {
+            if ($version.Version -match "^21") {
+                return "$baseOradata\XE\XEPDB1"
+            }
+            elseif ($version.Version -match "^18") {
+                return "$baseOradata\XE"
+            }
         }
+        return $baseOradata
     }
 
-    # Default fallback
+    # Legacy fallback for non-standard installations
+    # Extract base from ORACLE_HOME (e.g., C:\app\romfast from C:\app\romfast\product\21c\dbhomeXE)
+    if ($oraHome -match "^([A-Z]:\\[^\\]+\\[^\\]+)\\") {
+        $appBase = $Matches[1]
+        if ($version.IsXE) {
+            if ($version.Version -match "^21") {
+                return "$appBase\oradata\XE\XEPDB1"
+            }
+            elseif ($version.Version -match "^18") {
+                return "$appBase\oradata\XE"
+            }
+        }
+        return "$appBase\oradata"
+    }
+
+    # Ultimate fallback - this should rarely be reached
+    Write-LogWarning "Could not derive datafile path from ORACLE_HOME, using hardcoded default"
     return "C:\app\oracle\oradata"
 }