Postgresql backup and recovery

PostgreSQL is a powerful open source relational database that is widely used in various projects. An important part of working with PostgreSQL is backup and data recovery operations.

PostgreSQL backup:
1. Use the `pg_dump` command to create a text dump of your database:
“`
pg_dump dbname > backup.sql
“`

2. If you want to save only certain tables or data, specify the list of objects after the database name:
“`
pg_dump dbname –table=tablename –data-only > backup.sql
“`

3. To create a binary dump file, you can use the `-Fc` flag, which allows you to compactly store data.
“`
pg_dump -Fc dbname > backup.dump
“`

4. If necessary, it may be useful to add the `–no-owner' parameter to avoid problems when restoring to another server.

PostgreSQL Recovery:

1. Create a new database (if required):
“`
createdb newdb
“`

2a) To perform a SQL dump (`backup.sql`) back to the new database:
“`
psql newdb < backup.sql or cat dumpfile | psql newdb ``` 2b) To load a `.dump` format file (`backup.dump`) into a new database: ``` pg_restore -d newdb backup.dump ``` 3. If you want to load only certain tables or data , use the `--table=tablename` flag. It is important to remember about security and save backup copies of PostgreSQL databases on separate devices to prevent data loss in case of system failures or other unforeseen circumstances. I hope this information will be useful!View all data recovery questions