API This chapter explains the classes available in JGroups that will be used by applications to build reliable group communication applications. The focus is on creating and using channels. Information in this document may not be up-to-date, but the nature of the classes in JGroups described here is the same. All of the classes discussed here are in the org.
To remotely access an Oracle database, there exists a separate process referred to as the Oracle listener. In the Dedicated Server configuration versus the Shared Server configuration every established database session has its own process executing on the server.
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.
PostgreSQL also has the concept of a warm standby since 8. There are no separately named processes like in Oracle for the different duties within the database environment.
If you were to look at the process list ps the name of the processes would be postgres. However, on most platforms, PostgreSQL modifies its command title so that individual server processes can readily be identified.
You may need to adjust the parameters used for commands such as ps and top to show these updated titles in place of the process name "postgres".
The processes seen in a process list can be some of the following: Master process - launches the other processes, background and session processes.
Writer process - background process that coordinates database writes, log writes and checkpoints. Stats collector process - background process collecting information about server activity.
The server processes communicate with each other using semaphores and shared memory to ensure data integrity throughout concurrent data access. The databases are separate from one another usually sharing only the Oracle listener process.
PostgreSQL has the concept of a database cluster. A database cluster is a collection of databases that is stored at a common file system location the "data area". It is possible to have multiple database clusters, so long as they use different data areas and different communication ports.
The processes along with the file system components are all shared within the database cluster. 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 following are some of the cluster configuration files: This subdirectory is the default location for the database's files; in particular, its system catalogs are stored there. Several components that Oracle DBAs usually equate to one database are shared between databases within a PostgreSQL cluster, including the parameter file, control file, redo logs, tablespaces, accounts, roles, and background processes.
The physical representation of a tablespace within PostgreSQL is simple: When a database is created, the default tablespace is where by default all of the database objects are stored.
In Oracle this would be similar to the System, User, and Temporary tablespaces. Preferably the location of the system catalog information and the application data structures would reside in separately managed tablespaces. However, there exists no size limitation except physical boundaries placed on the device by the OS.Home Subscribe PostgreSQL C tutorial.
This is a C programming tutorial for the PostgreSQL database. It covers the basics of PostgreSQL programming with the C API. In this guide we'll run you through installing Bitbucket Data Center, which is a clustered solution, in a Linux environment. This guide covers installing for the first time, with no existing data, or that you already have a production instance of Bitbucket Server, and that you are aiming to migrate that to a Bitbucket Data Center instance.
JGroups is toolkit for reliable group communication. Processes can join a group, send messages to all members or single members and receive messages from members in the group. This tutorial will specifically cover the process of setting up Telegraf and InfluxDB to monitor PostgreSQL. For any newcomers to the scene, PostgreSQL (or just Postgres for short) is a really.
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