T.I.L_220726

What’s New for Today

1. Java Spring Framework
   • recap
   • DB Transaction
     • ACID
     • Isolation level
     • auto commit true/false
     • Transaction Lock
2. CS Study
   • DB
     • Index
     • Primary/Clustered/Secondary
     • Query Processing
     • Join/Selection Selectivity
     • Query Optimization
     • Join methods(Sort-Merge/Nested-Loop/Hash)
     • Transactions
     • Isolation Level
     • Concurrency Control