I know how to restore a single table form postgresql database backup file.
For Example: To restore password_history table i use the below command and it works fine.
pg_restore --data-only --table=password_history C:\Users\sjayaram\Desktop\dcmdb-01-17-2014-10-19-18.backup > passwordhistory.txt
Whats the command to restore a single "View" from postgresql database backup file.
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I have a .sql file of the database backup. PostgreSQL is installed in my system and I use pgadmin4 to communicate with database. I want to restore this .sql file using pgadmin. Can someone please guide me.
An SQL script that was generated with pg_dump without the --inserts option cannot be restored with pgAdmin, because the COPY data are mixed with the statements. You need psql for that.
You could use one of the other backup formats ("custom", "directory" or "tar") and use pgAdmin to restore that. But all that pgAdmin does in this case is call pg_restore, so you might as well do that yourself from the command line.
Another option is to launch the "psql tool" from pgAdmin, which is nothing else than psql. Then you can load the dump with \i dumpfile.sql.
I'm having difficulty restoring a DB to an AWS RDS Postgresql instance. Context is that i am backing up from one RDS instance and restoring to another RDS insurance. They both have the same version of Postgresql 9.6.5.
I was able to take a dump using the following command:
./pg_dump.exe -U dbuser -W -h prod-pgsql-rds.3ft5coqxjdnq.eu-west-2.rds.amazonaws.com -d devdb > c:\tmp\backup.sql
From the resulting .sql file, I then attempted a restore to another RDS instance which is also using Postgresql 9.6.5 using below command:
./pg_restore.exe -U dbuser -d testdevdb -h dev-pgsql-rds.cym8coqx52lq.eu-west-2.rds.amazonaws.com "c:\tmp\backup.sql"
*I also tried the -f switch in the above restore command instead of the " " quotes before/after the file name
But when I try to restore it to a newly created database I get the following error:
pg_restore: [archiver] input file does not appear to be a valid archive
Can anyone help? FYI, I am using PGAdmin 4 via Windows PowerShell. I have to edit some of the values in the strings above due to data sensitivity.
pg_restore is only used for the other, non-plain-text output formats that pg_dump can output. For .sql dumps, you just use psql. See the docs on restoring from backups.
In a Unix env, you'd do psql [yourflags] < /tmp/backup.sql, but I'm unfamiliar with powershell and don't know if it supports < for input redirection; hopefully either it's present or you know the equivalent PowerShell syntax.
So I couldn't get psql or pg_restore to work so opted to import the .SQL file into via the SQL query tool in PGAmdin. This through up some errors so had to make several changes to the .SQL file and perform below:
Commented out a couple of lines that were causing errors
Elevated permissions for the user and made him the owner of for the Schema and DB properties by right-clicking on these via PGAdmin
The .sql file was making several references to the user from the source RDS DB so had to do a find and replace with a user account created for the destination RDS DB. Alternatively, I could have just created a new user on the destination DB with the same username and password as the source DB and then make him the owner in ref to step 2.
I have downloaded pg_dump data from DeepDive Open Datasets. It is a file with extension .sql and to my knowledge that is a text file with SQL commands in it to recreate the database. I'm trying to peruse the data. How do I set up a Postgres database to do that?
I tried to use pgAdmin4 to view the data. However, I'm not sure how to set up and add a new server to read the data. I'm not sure if that is the correct approach.
I would appreciate any guidance with this.
You would view the dump itself with a pager like more or less; such a dump is a plain text file with SQL statements.
To restore such a dump you need to use psql, the command line client:
psql -U postgres -d adatabase -f dumpfile.sql
pgAdmin cannot restore such a dump, because it contains COPY ... FROM STDIN statements intermixed with the data.
I am taking the dump of postgres database using "pg_dump database_name > backup.sql". Later on I am doing some modifications in the original database(database_name) and then I am restoring the data from the backup file(backup.sql). But the result is that, the database doesn't gets restored to the original state, instead it adds the original data to the modified data(modified + original).I just want it to restore to the original state, shall i delete all the data from the database before restoring it from the backup file, since it gives the original state of the database. Or is there any other way to do this?
The default format fo pg_dump is plain, so it creates a COPY statement. Hence when you psql backup.sql you just run those copy over existing data. To rewrite data, you should either drop tables first or pg_dump -F c and pg_restore -c.
Warning - in both cases it will destroy old data (this seems what you want though)
-c
--clean Clean (drop) database objects before recreating them. (Unless --if-exists is used, this might generate some harmless error messages, if any objects were not present in the destination database.)
As #Craig Ringer suggests, drop/recreate from backup would be much easier and cleaner. To drop database you run DROP DATABASE au - note that there should be no connected users to success. Then you have to create db: CREATE DATABASE au and run psql -f backup.sql -d au
Take the dump with -c option: pg_dump -c database_name > backup.sql. See pg_dump docs.
I have a dump of PostgreSQL database, which I created with command:
pg_dump database_name > dumpname.sql
I would like to restore database from this dump but I get manny errors "...already exists". Is it possible to overwrite existing database records from dump? I have to restore database, but I can't drop it.
If you use the --clean option of pg_dump, the tables will be dropped and recreated.