SQL Database Language

  1. Transaction Management and Concurrency
    1. Transaction Fundamentals
      1. Transaction Definition
        1. Unit of Work Concept
          1. Transaction Boundaries
            1. Transaction States
            2. ACID Properties
              1. Atomicity
                1. All-or-Nothing Principle
                  1. Transaction Rollback
                    1. Partial Execution Prevention
                    2. Consistency
                      1. Data Integrity Maintenance
                        1. Constraint Enforcement
                          1. Valid State Transitions
                          2. Isolation
                            1. Concurrent Transaction Separation
                              1. Interference Prevention
                                1. Isolation Level Control
                                2. Durability
                                  1. Permanent Change Commitment
                                    1. System Failure Recovery
                                      1. Data Persistence Guarantee
                                    2. Transaction Control Commands
                                      1. BEGIN TRANSACTION
                                        1. Transaction Initiation
                                          1. Explicit Transaction Start
                                          2. COMMIT Operations
                                            1. Change Confirmation
                                              1. Permanent Data Modification
                                                1. Transaction Completion
                                                2. ROLLBACK Operations
                                                  1. Change Reversal
                                                    1. Transaction Cancellation
                                                      1. Error Recovery
                                                      2. SAVEPOINT Management
                                                        1. Partial Rollback Points
                                                          1. Nested Transaction Simulation
                                                            1. ROLLBACK TO SAVEPOINT
                                                              1. RELEASE SAVEPOINT
                                                              2. AUTOCOMMIT Mode
                                                                1. Automatic Transaction Handling
                                                                  1. Single Statement Transactions
                                                                    1. Mode Configuration
                                                                  2. Concurrency Control
                                                                    1. Concurrent Access Issues
                                                                      1. Multi-User Environment Challenges
                                                                        1. Lock-Based Concurrency Control
                                                                          1. Optimistic vs Pessimistic Control
                                                                          2. Concurrency Problems
                                                                            1. Dirty Reads
                                                                              1. Uncommitted Data Reading
                                                                                1. Transaction Isolation Failure
                                                                                2. Non-Repeatable Reads
                                                                                  1. Inconsistent Read Results
                                                                                    1. Data Modification Between Reads
                                                                                    2. Phantom Reads
                                                                                      1. New Row Appearance
                                                                                        1. Range Query Inconsistency
                                                                                        2. Lost Updates
                                                                                          1. Concurrent Modification Conflicts
                                                                                            1. Update Overwriting
                                                                                          2. Isolation Levels
                                                                                            1. READ UNCOMMITTED
                                                                                              1. Lowest Isolation Level
                                                                                                1. Dirty Read Permission
                                                                                                  1. Performance Benefits
                                                                                                    1. Data Consistency Risks
                                                                                                    2. READ COMMITTED
                                                                                                      1. Committed Data Only
                                                                                                        1. Dirty Read Prevention
                                                                                                          1. Default Level in Many Systems
                                                                                                          2. REPEATABLE READ
                                                                                                            1. Consistent Read Results
                                                                                                              1. Phantom Read Possibility
                                                                                                                1. Higher Isolation Guarantee
                                                                                                                2. SERIALIZABLE
                                                                                                                  1. Highest Isolation Level
                                                                                                                    1. Complete Transaction Isolation
                                                                                                                      1. Performance Impact
                                                                                                                        1. Deadlock Risk
                                                                                                                        2. Isolation Level Selection
                                                                                                                          1. Performance vs Consistency Trade-offs
                                                                                                                            1. Application Requirements
                                                                                                                              1. Concurrency Needs

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                                                                                                                          11. Database Security and Access Control