ORACLE 記憶體結構理解.

UGA:

USER SESSION STATE(including resource and security)  and  CURSOR_STATUS (running memory data,eg retrieve cursor data records).

PGA: STACK SPACE,可選(sort area size,session_state,cursor_status)

Large pool:MTS,parallel,部分備份和恢復,ORACLE XA

MTS:  userRequest process---- dispatcher001----request queue for all dispatchers ----shared servers----response queue for D000,D001----user dispatcher---user process.

BUCKET and buffer cache chain  $bh