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W E L C O ME T O D B A T E C H N O L O GI E S

W E L C O ME T O D B A T E C H N O L O GI E S. O R A C LE D A T A B A SE A R C HI T E C T U RE – 1 By Mr . PRASAD MYNUMPATI 18 Years Real Time in

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W E L C O ME T O D B A T E C H N O L O GI E S

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  1. WELCOMETODBATECHNOLOGIES ORACLEDATABASEARCHITECTURE – 1 By Mr. PRASAD MYNUMPATI 18 Years Real Time in INDIA-USA http://www.dbatechnologies.net/ www.dbatechnologies.net Building Career With Passion

  2. Architecture • Main components of Architecture • 1. ORACLE INSTANCE • SGA (Memory) & • Background Process • 2.ORACLE DATABASE • Storage Level

  3. ORACLE Instance Architecture – SGA • What is ORACLE INSTANCE? • Physical Memory (SGA) & Processes • SGA should be able to open in physical memory • What is SWAP? • Swap also a type of file system on HDD, it is used by OS when Real memory usage is at high • Swap must be available before installing OracleSoftware

  4. Oracle Instance Architecture – PROCESSES • Each connection to UNIX operating system is process • While starting up instance • – SGA (Memory Structures) • – Background Process ($ps) • Background process are required to manage memory structures and database files. • Some of the important background process are: DBWn, LGWR, SMON, PMON, ARCH,RECO

  5. Instance Architecture SGA-MandateandOptionalmemory structures and background processes Streams Pool Large DBWn LGWR SMON PMON CKPT RECO

  6. What is ORACLE DATABASE? • ORACLE DATABASE is a combination of 3 different types of files • Different types of files (C,R,D) • -Control Files • -Redo log files • -Data files

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