What do mysql backup and restore ?

  1. pasterrichard05 profile image61
    pasterrichard05posted 3 years ago

    What do mysql backup and restore ?

    I am newbie to mysql and want to clarify below on mysql backup and restore

    What are the things needed to backup mysql and restore it like database name, username, password etc.

    1)I have a database which need to be restored on different server so I used mysql dump command to backup the database by using username root and now during restoration on different server what is the username and password I need to use.

    2)If I have created a new empty database on new server so can I restore old database on this new database.

  2. pauldeeds profile imageSTAFF
    pauldeedsposted 3 years ago

    You will need to recreate the grants on the new server.  They typically aren't part of the mysqldump export.  There are tools, such as pt-show-grants that can help with that, but for simple configuration it should be pretty easy to just run the appropriate GRANT commands.

    A grant for the root user was probably part of the initial mysql server setup process.  If it wasn't you'll need to do that before you can do anything else.  You can import the dump using the username/password of the root user.  But, for security reasons you should use less privileged users for typical connections.

    There are some decent answers here as well:

    http://serverfault.com/questions/8860/h … new-server

  3. drynalexandr profile image61
    drynalexandrposted 3 years ago

    You have many options!!!
    If you don't get to connect on database, you will have to restore it.
    The basic restore command for restoring a full database from a disk backup image is
    db2 RESTORE DATABASE dbname FROM directory TAKEN AT timestamp
    To restore from TSM use:
    db2 RESTORE DATABASE dbname USE TSM TAKEN AT timestamp
    The timestamp represents the time the database
    was backed up (it's the timestamp you see when the backup completes and
    it also exists in the recovery history file and for backups to disk you
    can see it in the filename or path)
    Assuming the backup was done online with log archiving enabled, there is one more thing to do. When you perform an online backup, the restore must apply any transactions that were going on when the backup occurred in order to make sure the database is consistent. So now you must roll forward the database or the tablespaces to a point of consistency. For database level restores, you can roll forward to any point between the end of the backup and the current time (i.e. end of logs).
    To check if a backup image is corrupted, you can use the db2ckbkp command
    db2ckbkp -h
    To check the backups taken on your server you can perform the following command
    db2 list history backup all for
    Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
    -- --- ------------------ ---- --- ------------ ------------ --------------

    B D 20080328013138001 N D S0000002.LOG S0000002.LOG

    Contains 4 tablespace(s):
    00002 USERSPACE1

    00004 DMS_TS

    Start Time: 20080328013138
    End Time: 20080328013213

    Status: A

    EID: 8 Location: c:\SAMPLE.0\DB2\NODE0000\CATN0000\20080328
    The Start Time: 20080328013138 is the backup image timestamp.
    To roll the database forward to the end of the logs and open the database for access
    To rollforward to a given point in time you can say
    If you able to connect on database, but some tablespaces are offline or are in the not normal state, you need to check and fix the problem.
    Soon, a document will be post here with more details step by step to teach what you have to do when a database get crashed
    http://bytes.com/topic/mysql/answers/96 … ost3793382


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