Oracle Architecture and Metrics




Oracle Architecture and Metrics

Here is an illustrated Nutshell FAQ on Oracle explained in-depth using a hands-on approach and constructivist sequence. This crystalizes stacks of books, several classes, thousands of user group entries, and years of hard-won experience.

Topics this page ... Authorization Methods Background Processes Catalog.sql Checkpoint Process (CKPT) Clusters in Tables Control Files Datafiles Data Dictionary Views DSS (Decision Support System) Enqueues Extents Fragmentation Instances Latches Library Cache Log Writer (LGWR) Memory areas OLTP (On-Line Transaction Processing) Packages Parameter File Password Files Performance Views Process Monitor (PMON) Program Global Area (PGA) Processes RMAN Redo Logs Rollback Segments Sequences SID (System Identifier) Shared Pool Shared SQL Pool Sorting Synonyms Server Services Server Manager utility System Global Area (SGA) System Monitor (SMON) Triggers Views
 

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Overview: Architecture Core Components

The Oracle Database Management System (DBMS) consists of several components (loosely similar to UNIX's implementation of the multitasking operating system):

  • Oracle core software and scripts installed in the folder specified in $ORACLE_HOME environment variable and in Windows Registry.
  • Clients establishing sessions connecting to user applications by going through interfaces using Protocols.
  • Databases” have two parts:
    • Instances (the “brain" of the system) provide the capability of accessing stored data. Each instance consists of:
      • data files in static storage devices,
      • memory areas in RAM used by
      • background processes servicing requests and user applications
  • Development and Query Tools managing the DBMS such as the Enterprise Manager and The Database configuration Assistant (DBCA); and

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