[HANA] HANA DB Startup

DB Startup overview

 

HDB daemon startup overview

 

• Runlevel 1-2

 

• Runlevel 3-5

 

 

Indexserver Startup Overview

 

1. Core/CPU Information Collection
   
   
   
   
2. Persistency Initialization
   
   
   
   
   
3. Row Store
   
   
   
   
4. Log Replay
   
   
   
   
   
   
5. DTX (Distributed Transaction) Consistency Check / How it work?
   • DTX Consistency Check : 분산 트랜잭션을 위한 트랜잭션의 정합성 체크
   • Terminology
     • LSN (Log Sequence Number)
       • Log 위치를 가리킴
       • DTX Consistency에서 LSN은 Log Position 대신 사용
     • Master & Slave Volumes : 모든 volume이 분산 트랜잭션과 관련됨
       • Vaious Combination
         • 1node (Master: Master indexserver, Slave: xsengine)
         • 2nodes (Master indexserver, Slave: indexserver, xsengine)
   • How it works?
     • Both Master & Slave sides get LSNs of the slave individually
     • The master compare them
       • Match : Savepoint
       • Mis-Match : Crash
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6. RS Consistency Check
   
   
   
7. HANA DB is ready - DONE
   
   
   
   

Ananlysis Tip