pg_hba.conf - Client authentication configuration file.nf - Parameter or main server configuration file.
The following are some of the cluster configuration files: The PGDATA directory contains several subdirectories and configuration files. All the data needed for a database cluster is stored within the cluster's data directory, commonly referred to as PGDATA (after the name of the environment variable that can be used to define it). The processes along with the file system components are all shared within the database cluster. It is possible to have multiple database clusters, so long as they use different data areas and different communication ports. A database cluster is a collection of databases that is stored at a common file system location (the "data area"). PostgreSQL has the concept of a database cluster. The databases are separate from one another usually sharing only the Oracle listener process. Within a server, one or more Oracle instances can be built. The server processes communicate with each other using semaphores and shared memory to ensure data integrity throughout concurrent data access.
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Note: PostgreSQL also has the concept of a warm standby (since 8.2) with the shipping of archive logs (introduced in 8.0). To keep things simple any comparisons with an Oracle database will always refer to a single instance managing a single database, RAC and Data Guard will not be mentioned. In the Dedicated Server configuration (versus the Shared Server configuration) every established database session has its own process executing on the server.To remotely access an Oracle database, there exists a separate process referred to as the Oracle listener.In the latter case Oracle uses ASM (Automatic Storage Management) to address data. This may be files on a local file system, NFS files or SAN Devices.
An Oracle database consists of the database datafiles, control files, redo log files, archive log files, and parameter file.The important Oracle background processes are the following:.An Oracle instance consists of the Oracle background processes and the allocated memory within the shared global area (SGA) and the program global area (PGA).An Oracle database server consists of an Oracle instance and an Oracle database.For completeĭocumentation refer to the PostgreSQL manuals.
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Intended to be an introduction to PostgreSQL, not a tutorial or a completeĭefinition of how to administer a PostgreSQL database. Some terms and the management of a PostgreSQL database. The following article contains information to help an Oracle DBA understand