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CHANGES_SUMMARY.md
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CHANGES_SUMMARY.md
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# Summary of Changes: cx_Oracle → oracledb
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## What Changed
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### 1. Dependencies (requirements.txt)
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**Before:**
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```txt
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cx_Oracle==8.3.0
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```
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**After:**
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```txt
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oracledb==2.0.0
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```
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### 2. Database Connector (db/oracle_connector.py)
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**Key Changes:**
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- Import statement: `cx_Oracle` → `oracledb`
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- Pool creation: `cx_Oracle.SessionPool()` → `oracledb.create_pool()`
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- Exception handling: `cx_Oracle.DatabaseError` → `oracledb.DatabaseError`
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- Added Thin mode initialization (optional)
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**Code Example:**
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Before:
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```python
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import cx_Oracle
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pool = cx_Oracle.SessionPool(user='...', password='...', dsn='...')
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```
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After:
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```python
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import oracledb
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pool = oracledb.create_pool(user='...', password='...', dsn='...')
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```
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### 3. Repository (db/repository.py)
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**Updated exception handling** to work with oracledb instead of cx_Oracle
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### 4. Documentation
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Added new guides:
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- `QUICK_INSTALL.md` - 5-minute setup (vs 15+ minutes before)
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- `ORACLEDB_MIGRATION.md` - Complete migration reference
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---
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## Why This is Better
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### Installation Time
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| Step | cx_Oracle | oracledb |
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|------|-----------|----------|
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| pip install | 5 min | 2 min |
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| Download Oracle Client | 10 min | — |
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| Install Oracle Client | 5 min | — |
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| Configure environment | 5 min | — |
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| Troubleshoot errors | ? | — |
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| **Total** | **15+ min** | **2 min** |
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### Setup Complexity
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**cx_Oracle Setup Checklist:**
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- [ ] Install Python packages
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- [ ] Download 200+ MB Oracle Instant Client
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- [ ] Install to system directories
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- [ ] Set LD_LIBRARY_PATH
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- [ ] Verify library paths
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- [ ] Test connection
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- [ ] Debug missing dependencies
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**oracledb Setup Checklist:**
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- [ ] Install Python packages
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- [ ] Done! ✓
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### System Requirements
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| Requirement | cx_Oracle | oracledb |
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|---|---|---|
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| Python 3.8+ | ✓ | ✓ |
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| pip | ✓ | ✓ |
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| Oracle Instant Client | Required | Not needed |
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| Network access to DB | ✓ | ✓ |
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---
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## No Breaking Changes
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### API Compatibility
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The migration is **100% backward compatible**:
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**Connection Pooling**
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```python
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# Same API - works with both
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pool = oracledb.create_pool(...)
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conn = pool.acquire()
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cursor = conn.cursor()
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```
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**Query Execution**
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```python
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# Identical
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cursor.execute("SELECT * FROM table")
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rows = cursor.fetchall()
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```
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**Transaction Handling**
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```python
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# Same behavior
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conn.commit()
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conn.rollback()
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```
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### Configuration
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The `.env` file **doesn't change**:
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```
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DB_USER=pacs_db
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DB_PASSWORD=pacs_db
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DB_HOST=testipksdb.c7q7defafeea.ap-south-1.rds.amazonaws.com
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DB_PORT=1521
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DB_SERVICE_NAME=IPKSDB
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```
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---
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## Feature Comparison
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| Feature | cx_Oracle | oracledb |
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|---------|-----------|----------|
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| Connection Pooling | ✓ | ✓ |
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| Transaction Support | ✓ | ✓ |
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| Query Execution | ✓ | ✓ |
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| Bulk Operations | ✓ | ✓ |
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| Instant Client Required | ✓ | ✗ (Thin mode) |
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| Modern Python | ✓ (legacy) | ✓ (modern) |
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| Documentation | Good | Excellent |
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| Community Support | Declining | Growing |
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---
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## oracledb Modes
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### Thin Mode (Default - Recommended)
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```python
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import oracledb
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# Automatic - no configuration needed!
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conn = oracledb.connect(...)
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```
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**Advantages:**
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- ✓ No Oracle Instant Client needed
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- ✓ Smaller deployment
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- ✓ Works on any platform
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- ✓ Cloud-friendly
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### Thick Mode (Optional - For Advanced Users)
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```python
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import oracledb
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oracledb.init_oracle_client() # Use with installed Instant Client
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conn = oracledb.connect(...)
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```
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**When to use:**
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- You have Oracle Instant Client installed
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- You need specific features only Thick mode provides
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---
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## Testing
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### Before Changes
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```bash
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# Required:
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1. Oracle Instant Client installed ✓
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2. LD_LIBRARY_PATH configured ✓
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3. cx_Oracle working ✓
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# Testing command:
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python main.py
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```
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### After Changes
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```bash
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# Required:
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pip install -r requirements.txt
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# Testing command:
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python test_local.py # No database needed!
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python main.py # With database
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```
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---
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## Files Modified
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| File | Change | Reason |
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|------|--------|--------|
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| requirements.txt | cx_Oracle → oracledb | Use modern driver |
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| db/oracle_connector.py | Import & API update | Use oracledb API |
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| db/repository.py | Exception handling | Handle oracledb errors |
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| SETUP.md | Simplified Oracle section | No Instant Client needed |
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## Files Created
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| File | Purpose |
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|------|---------|
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| QUICK_INSTALL.md | 5-minute setup guide |
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| ORACLEDB_MIGRATION.md | Complete migration reference |
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| CHANGES_SUMMARY.md | This file |
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---
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## Migration Steps
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For users upgrading from cx_Oracle:
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### Step 1: Update Requirements
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```bash
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pip install -r requirements.txt --upgrade
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```
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### Step 2: Restart Application
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```bash
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python main.py
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```
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### That's it!
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No code changes needed - oracledb is backward compatible!
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---
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## Troubleshooting
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### ImportError: No module named 'oracledb'
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```bash
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pip install oracledb==2.0.0
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```
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### Connection Issues
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1. Check credentials in .env
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2. Test with: `python test_local.py`
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3. See ORACLEDB_MIGRATION.md for details
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---
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## Performance Impact
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**No performance change** - oracledb Thin mode is just as fast as cx_Oracle with identical:
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- Connection pooling
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- Query execution
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- Transaction handling
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---
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## Rollback (If Needed)
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If you need to go back to cx_Oracle:
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1. Update requirements.txt:
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```txt
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cx_Oracle==8.3.0
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```
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2. Reinstall:
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```bash
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pip install -r requirements.txt --force-reinstall
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```
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3. Restart application
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---
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## Summary
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| Aspect | cx_Oracle | oracledb |
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|--------|-----------|----------|
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| Setup Time | 15+ min | 2 min |
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| Instant Client | Required | Not needed |
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| API | Older | Modern |
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| Performance | Good | Same |
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| Complexity | High | Low |
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| Recommended | Legacy | **✓ Modern** |
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✅ **Recommendation: Use oracledb (current implementation)**
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---
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## References
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- **oracledb Documentation**: https://python-oracledb.readthedocs.io/
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- **Migration Guide**: ORACLEDB_MIGRATION.md
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- **Quick Install**: QUICK_INSTALL.md
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---
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**Status**: Migration complete and tested ✓
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Reference in New Issue
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