Database Overview

RDBMS

Administra muchos datos

Ambientes multiusuario

Mantiene relaciones entre los datos

Provee acceso seguro a datos

Alto desempeo en respuesta a peticiones

Terminologia

Base de datos

Coleccion de datos Guardados en Tablespaces

Logicos

Tratados como una unidad

ObjetosTabla

Indices

Real Application Cluster (RAC)

Instancia

combinacionOracle Background processes

Memory Buffers

Cada BD Oracle necesita una instancia

Memoria

SGA

Processes

System Identifier (DBSID)

Unicamete 3 Letras

Identificador del sistema de BD.

Tablespace

Data Dictionary

1. Database Architecture

Listener

Procesos

shadow proces

Database Writer

background processes

Area de Memoria

System Global Area (SGA)

row cache

database buffer cache

shared poolShared SQL Area/Shared Cursor Cache

Data Dictionary Cache / Row Cache

Redo Log BufferOnline Redo Log File

Large Pool

PGA(Program global area)Optimal work area size

Automatic Program Global Area

Datablock

Dirtyblock

Onepass sort

Multipass sort

CheckpointCheckpoint Process (CKPT)

Redo Entries/After Images

Log Writer (LGWR)

Online Redo Log

System Change Number (SCN)

Undo Entries/Before Images

Log Switch

Log Sequence Number (LSN)

Control File

Mirroring

Archiver (ARC0)Offline Redo Log File

System Monitor (SMON

Process Monitor (PMON)

Directorios

dbs (Unix) / database (Win

sapdata

origlogA/B, mirrorlogA/B

oraarch

saptracesaptrace/background

saptrace/usertrace

saparch

Sapbackup

sapreorg, sapcheck

Variables de entorno

ORACLE_SID

ORACLE_HOME

SAPDATA_HOME

ORA_NLS10 UNIX

2. Connecting to the Database

Oracle System Privileges

Sistema

Objeto

SYSDBA/SYSOPER

user accessNiveles de acceso

Operting system

database

SAP system

Operating System Users and Groups

UNIXora

adm

Windowsadm

SAPService

Oracle Database UsersSYS

SYSOPER

Usuarios Oracle creados por SAP

UNIXOPS$ADM

OPS$ORA

WindowsOPS$\ADM

OPS$\SAPSERVICE

SAP SAPR3

Operating System AuthenticationREMOTE_OS_AUTHENT=TRUE

OS_AUTHENT_PREFIX=OPS$

Oracle Database Roles

Conectarse a Oracle:

sqlplus /nolog

connect /AS SYSDBA

connect /AS SYSOPER

Work Process Connection to OracleSO OPS$

SAP / SAPR3 en la tabla SAPUSER

Database Architecture.mmap - 15/01/2009 -