![]() Other possible file layouts are discussed in Section 20.2.īy default postgres starts in the foreground and prints log messages to the standard error stream. Typically, -D or PGDATA points directly to the data area directory created by initdb. The location must be specified by the -D option or the PGDATA environment variable there is no default. When postgres starts it needs to know the location of the data area. More than one postgres instance can run on a system at one time, so long as they use different data areas and different communication ports (see below). A database cluster is a collection of databases that is stored at a common file system location (the “ data area”). One postgres instance always manages the data of exactly one database cluster. The postgres instance then starts a separate server process to handle the connection. In order for a client application to access a database it connects (over a network or locally) to a running postgres instance. The below example shows that list the databases by using \list command.Postgres is the PostgreSQL database server. List the databases by using \list command The below example shows that list the databases by using \list command.Ĥ. ![]() List the databases by using \list command The below example shows that list the databases by using the \l command.ģ. ![]() List the databases by using the \l command The below example shows that list the databases by using \l command.Ģ. Pg_database catalog table is very important to fetch the information related to all the databases.īelow is an example of a list of the databases.
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