Why does PG _ basebackup not switch to a new Wal file?

Why does PG _ basebackup not switch to a new Wal file?

The backup history file is not created in the database cluster backed up. pg_basebackup cannot force the standby to switch to a new WAL file at the end of backup. When you are using -X none, if write activity on the primary is low, pg_basebackup may need to wait a long time for the last WAL file required for the backup to be switched and archived.

What to do if database name is ignored in PG basebackup?

The option is called –dbname for consistency with other client applications, but because pg_basebackup doesn’t connect to any particular database in the cluster, database name in the connection string will be ignored. Specifies the host name of the machine on which the server is running.

When to use PG base backup in PostgreSQL?

These are taken without affecting other clients to the database, and can be used both for point-in-time recovery (see Section 24.3) and as the starting point for a log shipping or streaming replication standby servers (see Section 25.2 ).

What does recovery.conf file do in PG _ basebackup?

The recovery.conf file will record the connection settings and, if specified, the replication slot that pg_basebackup is using, so that the streaming replication will use the same settings later on. This option can only be used together with -X stream. It causes the WAL streaming to use the specified replication slot.

Where to write the output of PG base backup?

Directory to write the output to. pg_basebackup will create the directory and any parent directories if necessary. The directory may already exist, but it is an error if the directory already exists and is not empty. When the backup is in tar mode, and the directory is specified as – (dash), the tar file will be written to stdout.

What happens when PG _ basebackup aborts with an error?

By default, when pg_basebackup aborts with an error, it removes any directories it might have created before discovering that it cannot finish the job (for example, data directory and write-ahead log directory). This option inhibits tidying-up and is thus useful for debugging. Note that tablespace directories are not cleaned up either way.

Are there limitations to online backup from standby?

Note that there are some limitations in an online backup from the standby: The backup history file is not created in the database cluster backed up. pg_basebackup cannot force the standby to switch to a new WAL file at the end of backup.

Is it possible to back up individual PostgreSQL databases?

Backups are always taken of the entire database cluster; it is not possible to back up individual databases or database objects. For individual database backups, a tool such as pg_dump must be used. The backup is made over a regular PostgreSQL connection, and uses the replication protocol.

How to backup PostgreSQL with PG _ basebackup?

The postgresql.auto.conf file will record the connection settings and, if specified, the replication slot that pg_basebackup is using, so that streaming replication will use the same settings later on. Relocates the tablespace in directory olddir to newdir during the backup.

Which is the target directory for PG basebackup?

Sets the target directory to write the output to. pg_basebackup will create this directory (and any missing parent directories) if it does not exist. If it already exists, it must be empty. When the backup is in tar format, the target directory may be specified as – (dash), causing the tar file to be written to stdout.

Which is the best value for PG base backup?

A suffix of k is also accepted, and has no effect. Valid values are between 32 kilobytes per second and 1024 megabytes per second. The purpose is to limit the impact of pg_basebackup on the running server. This option always affects transfer of the data directory.

How to clean up Wals in PostgreSQL backup policy?

In order to do a clean up of WALs, we need to keep in mind the WAL retention requirements and criteria, as losing essential WALs can be disastrous. Criteria 1: All WALs from the time of the oldest backup, which still falls in the backup retention policy and Point-in-time requirement, need to be preserved.