How do I use a specific database in PostgreSQL?

How do I use a specific database in PostgreSQL?

Set Up a PostgreSQL Database on Windows

1. Download and install a PostgreSQL server.
2. Add the PostgreSQL bin directory path to the PATH environmental variable.
3. Open the psql command-line tool:
4. Run a CREATE DATABASE command to create a new database.
5. Connect to the new database using the command: \c databaseName.

How do I duplicate a Postgres database?

To create a copy of a database, run the following command in psql:

1. CREATE DATABASE [Database to create] WITH TEMPLATE [Database to copy] OWNER [Your username];
2. CREATE DATABASE [Database to create] WITH TEMPLATE [Database to copy] OWNER [Your username];
3. SELECT pg_terminate_backend(pg_stat_activity.

How do I archive a Postgres database?

So, we can considered to archive the old data with the below process,

1. Clone a new database(DB-2) from existing database(DB-1).
2. Delete an old data from DB-1, so it will have only the last 2 years records.In case If I need old data can connect DB-2.
3. Every month should move an old data from DB-1 to DB-2, and delete.

What is PITR in PostgreSQL?

PITR refers to PostgreSQL’s ability to start from the restore of a full backup, then progressively fetch and apply archived WAL files up to a specified timestamp. When a PostgreSQL server process starts up and discovers a recovery. conf file in the data directory, it starts up in a special mode called “recovery mode”.

What is Max_wal_size?

max_wal_size (integer) Maximum size to let the WAL grow during automatic checkpoints. This is a soft limit; WAL size can exceed max_wal_size under special circumstances, like under heavy load, a failing archive_command, or a high wal_keep_segments setting. The default is 1 GB.

Where are Postgres WAL files?

WAL logs are stored in the directory pg_xlog under the data directory, as a set of segment files, normally each 16 MB in size (but the size can be changed by altering the –with-wal-segsize configure option when building the server).

What is Pg_is_in_recovery?

pg_is_in_recovery() is a system function for retrieving the recovery status of an instance. pg_is_in_recovery() was added in PostgreSQL 9.0.

What is PostgreSQL replication?

What Is PostgreSQL Replication? The process of copying data from a PostgreSQL database server to another server is called PostgreSQL Replication. The source database server is usually called the Master server, whereas the database server receiving the copied data is called the Replica server.

How to do point in time recovery with PostgreSQL 9.2?

This post describes how to do point in time recovery with PostgreSQL 9.2 : PITR. Point in time recovery (PITR) simply means restoring data upto certain point in time. This method uses low level API backups, if you want to implement PITR using pg_basebackup utility then read my other post here.

How to save time for Pitr in PostgreSQL?

To save the time needed for PITR, you can add another slave that can always be delayed by a certain amount of time—this could be hours or days. For example, if I know that my deployment is determined to be successful when no issues are observed in the first 12 hours, then I might delay one of the standbys by 12 hours.

How is the archiving done in PostgreSQL database?

To provide the database administrator with flexibility, PostgreSQL tries not to make any assumptions about how the archiving will be done. Instead, PostgreSQL lets the administrator specify a shell command to be executed to copy a completed segment file to wherever it needs to go.

How to do a database backup in PostgreSQL?

Taking a file system level backup of database directory is very simple and here are the steps to do it: 1. Connect to database as a super user and issue the following command to start backup process: “varlibpgsql” can be any string, this label identifies this backup operation uniquely.