Set the calculated number as its value and restart your PostgreSQL service. Open the PostgreSQL config file (nf) and find the max_wal_senders. Based on the above information you need to calculate the number of WAL sender processes and update the config. Also you need two WAL sender processes for creating a Standalone Hot Backups. PostgreSQL uses WAL to sync changes with replica servers in Streaming Replication method.So if you have Streaming Replication in place, you need one WAL sender process for each slave. Max_wal_senders is the maximum number of simultaneously running WAL sender processes. Set hot_standby as its value and restart your PostgreSQL service. Just open the PostgreSQL config file (nf) and find the wal_level. For Binary Backups you need to set this value to hot_standby. The default value is minimal, which writes only the information needed to recover from a crash or immediate shutdown. There is an item in Postgresql configuration file called wal_level which determines how much information is written to the WAL. We call these backups Binary Backups and these are the steps you need to follow to have one. It means if you take a file system backup and re-play the WAL commands generated during the backup process on the result file-set, then you will have a consistent backup which can be used to restore PostgreSQL to the exact state the database was when the backup finished. PostgreSQL uses a mechanism called write ahead log (WAL) to records every change made to the database's data files. If you directly copy the files that PostgreSQL uses to store the data in, you will have a File system level backup which can be restored by copy back those files.Īlthough this method is faster than creating a dump file, you can't use it while the PostgreSQL server is up and running, because the files you are trying to copy may change during the process and the result file-set will not be consistent.Įssentially this means that you can not use this method to backup a production PostgreSQL server as you are not able to shutdown your database every hour to take a backup. This is the fastest method you can use for taking a PostgreSQL backup. The good news is there are some other backup methods you can use to have a faster backup/restore process. I can't imagine a simpler process for the backup and restore of a database However as the backup file contains many many SQL commands, creating and restoring backups for a large database may take a very long time and that could make your backups useless - especially if you need to restore in a failover scenario. $ psql -U your-user-name dbname < backup-file
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