I want to take differential backup of a MYSQL DB, this backup should contain the data after the last full backup was taken. and then I should be able to restore both full and latest differential backup.
Ref: Like we do in MSSQL database.
I am able to take full backup with "mysqldump" but not able to find a way to take differential backup
MySQL does not manage incremental backups.
If you really want to do, you need to use another tool, like XtraBackup
Related
I'm working on trying to setup my local database with some mock data to work with. We have a development AWS account with a postgres database. I would like to create a backup of it, export it to my local computer, and restore to my local postgres database.
I've been trying to find how to do this online, but everything I'm finding is on how to backup to AWS and to restore back to AWS. I tried creating a snapshot and exporting it via S3 - but the snapshot doesn't produce a sql file to restore from like I was expecting.
If anyone can point me in the right direction I would very much appreciate it :)
I am afraid that the only chance you have is pg_dump/pg_restore.
Even if Amazon lets you get your hands on its file system backups, which I doubt, they may be of little use to you, since Amazon runs modified versions of PostgreSQL and you cannot be sure that the physical file format is identical to PostgreSQL.
A linux VM with postgres 9.4 was hacked into. (Two processes taking 100% cpu, weird files in /tmp, did not reoccur after kill(s) and restart.) It was decided to install the system from scratch on a new machine (with postgres 9.6). The only data needed was in one of postgres databases. A pg_dump of the database was made after the attack.
Regardless of whether the data - the tables/rows/etc. - were modified during the attack: is it safe to restore the database in the new system?
I consider using pg_restore with the -O option (ignores the user permissions)
The two dangers are:
important data could have been modified
back doors could have been installed in your database
With the first, you're on your own how to verify that your data are ok. The safest thing would be to use a backup from before the machine was compromized, but this would mean data loss.
For the second, I would run a pg_dumpall -s and spend a day reading it carefully. Compare it with a dump from a backup made before the breach. Watch out for weird object and column names and functions with SECURITY DEFINER.
I have full, differential and transactional backups of the database. I was trying to restore one by one; but only the full backup is getting restored, but after that when I am trying to restore the differential backup facing issue with SQL Server Management Studio. So I tried with some SQL commands, this is the link what I tried with to restore, but no luck
Restore differential backup
Can anyone tell me the steps tor restore these backups? Thank you
It is important to be acquainted with the restore sequence of how a full database backup is restored.
First, restore full database backup, differential database backup and all transaction log backups WITH NORECOVERY option. After that, bring back database online using WITH RECOVERY option.
Following is a sample Restore Sequence
RESTORE DATABASE FROM full_database_backup WITH NORECOVERY;
GO
RESTORE DATABASE FROM differential_backup WITH NORECOVERY;
GO
RESTORE LOG FROM log_backup WITH NORECOVERY;
GO
-- Repeat this until you restore last log backup
RESTORE DATABASE WITH RECOVERY;
GO
Note:
While performing a RESTORE operation using more than one file, always use the NORECOVERY flag. This will keep the database offline to prevent any changes which could create some integrity issues. Once all the backup files have been restored, run the RESTORE command with the RECOVERY option to get the database online and operational.
Source: URL
I am currently using pg_dump piped to gzip piped to split. But the problem with this is that all output files are always changed. So checksum-based backup always copies all data.
Are there any other good ways to perform an incremental backup of a PostgreSQL database, where a full database can be restored from the backup data?
For instance, if pg_dump could make everything absolutely ordered, so all changes are applied only at the end of the dump, or similar.
Update: Check out Barman for an easier way to set up WAL archiving for backup.
You can use PostgreSQL's continuous WAL archiving method. First you need to set wal_level=archive, then do a full filesystem-level backup (between issuing pg_start_backup() and pg_stop_backup() commands) and then just copy over newer WAL files by configuring the archive_command option.
Advantages:
Incremental, the WAL archives include everything necessary to restore the current state of the database
Almost no overhead, copying WAL files is cheap
You can restore the database at any point in time (this feature is called PITR, or point-in-time recovery)
Disadvantages:
More complicated to set up than pg_dump
The full backup will be much larger than a pg_dump because all internal table structures and indexes are included
Does not work well for write-heavy databases, since recovery will take a long time.
There are some tools such as pitrtools and omnipitr that can simplify setting up and restoring these configurations. But I haven't used them myself.
Also check out http://www.pgbackrest.org
pgBackrest is another backup tool for PostgreSQL which you should be evaluating as it supports:
parallel backup (tested to scale almost linearly up to 32 cores but can probably go much farther..)
compressed-at-rest backups
incremental and differential (compressed!) backups
streaming compression (data is compressed only once at the source and then transferred across the network and stored)
parallel, delta restore (ability to update an older copy to the latest)
Fully supports tablespaces
Backup rotation and archive expiration
Ability to resume backups which failed for some reason
etc, etc..
Another method is to backup to plain text and use rdiff to create incremental diffs.
I need to back up my database but I don't have enough disk space to dump it. Can I just use duplicity to perform incremental backups on the data directory? Would that corrupt the backup somehow? I don't mind a few of the latest rows missing, but I would like my backup to not be destroyed.
Does anyone know what the case is?
Thanks!
See this page. I believe duplicity uses rsync type mechanism, so you cannot simply grab the directory and go - see the page of that page about rsync. If you need to do a file system level backup, while online, then you'll need some sort of atomicity like snapshots.
Most likely, the backup simply wouldn't work.
Postgres has lots of backup options though, like PITR. I suggest a read through the fine manual.
No, you can't backup the data directory while the database service is running. You could backup the WAL-segments for a point in time recovery when you want to restore. You have to make sure you test your recovery as well, it's a litte more complicated then pgrestore of an ordinary dump.