61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
---
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title: "Postgresql Tips"
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date: 2025-04-30
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draft: false
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tags: ["linux", "Debian", "Postgresql", "Database", "pg_dump"]
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authors: ["trent"]
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post: 37
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---
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date: 2025-04-30
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## Introduction
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Sometimes you want to recreate an postgresql database on a different
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server or postgresql instance.
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And so here are some tips how to do that.
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## Backup and Restore Using Tar File
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### create a backup with `pg_dump`
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* switch to postgres user `su - postgres`
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* create backup `pg_dump -d mytestdb -F tar -f mytestdb.tar`
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* or with specific port `pg_dump -p5432 -d mytestdb -F tar -f mytestdb.tar`
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* examine contents of tar `tar -tvf mytestdb.tar`
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* alternately make a compressed backup
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* `pg_dump -d mytestdb -Fc -f mytestdb_compressed_backup`
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### restore with `pg_restore`
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* switch to postgres user `su - postgres`
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* start psql `psql -p5432`
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* `postgres# CREATE USER mytestuser;`
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* `postgres# \password mytestuser`
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* `postgres# CREATE DATABASE mytestdb WITH OWNER mytestuser;`
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* list users `postgres# \du`
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* list databases `postgres# \l`
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* `exit`
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* `pg_restore -p5432 -d mytestdb mytestdb.tar`
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* or `pg_restore -p5432 -d mytestdb mytestdb_compressed_backup`
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### verify the restored database
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* switch to postgres user `su - postgres`
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* start psql `psql -p5432`
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* change database `postgres# \c mytestdb`
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* list tables `postgres# \d` or `postgres# \dt`
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## Backup and Restore Schema Only
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### create a backup with `pg_dump`
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* switch to postgres user `su - postgres`
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* create backup `pg_dump --schema-only -d mytestdb -f mytestdb_schema.sql`
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* or with specific port `pg_dump -p54342 --schema-only -d mytestdb -f mytestdb_schema.sql`
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* examine sql file `less mytestdb_schema.sql`
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* note that the generated sql assigns ownership of each table, to that of the original database owner, upon creation
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### restore with `psql` command
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* switch to postgres user `su - postgres`
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* `psql -p5432 -d mytestdb -f mytestdb_schema.sql`
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### verify the restored database
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* switch to postgres user `su - postgres`
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* start psql `psql -p5432`
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* change database `postgres# \c mytestdb`
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* list tables `postgres# \d` or `postgres# \dt`
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