There is a copy of the oracle database - the database was turned off and data was copied from /oradata/ and /fast recovery area/ How to restore such a backup? Just to return the files from the backup to their places and set permisions does not work, I get a bunch of errors.
Related
I put MariaDB in ProgramData on Windows 10, create a system restore point, create a database in MariaDB, fill the database and roll back to the restore point, the database remains, but all the tables are empty, they open with an error table doesn't exist in engine
What can be wrong?
I need to take oracle database full backup (online) which is in archivelog mode. My current archive redo log partition space is very less, so i backup and delete archived redo log files then and there to manage the space. My question if i take rman full online backup without archive redo logs using command "backup incremental level 0 database" will it be consistent or not while restoring?
Backing up a running Oracle Database in ARCHIVELOG mode will create an inconsistent (hot) backup. You can verify this by running rman> list backup; (checking SCN of datafile, controlfile, spfile). With inconsistent backup - when restoring DB'll be inconsistent state and require some archive(s) to recover to an specific SCN.
I downloaded and installed the SQLite ODBC Driver from http://ch-werner.de/sqliteodbc/. Works great with one issue. I can't seem to get an exclusive lock if another app has the database open.
I'm using a CAD application called Altium. I'm trying to build a prototype parts database in SQLITE to house data. I installed the ODBC driver referenced above and I can get to the data just fine. The issue is if I try to open the same database in an app like SQLITEStudio or DB Browser for SQLITE I can never get an exclusive lock to write new records. Altium never closes its connection and I don't know if that's the problem or not.
When I read https://www.sqlite.org/lockingv3.html it seems to indicate that multiple processes would need to communicate in order for one to obtain an exclusive lock (necessary for a write). This leads me to believe my issue is the first app never releasing it's shared lock so the second app can never get an exclusive lock. Am I interpreting this correctly?
I'm experiencing the same difficulties with SQLite as an Altium database. The database file can't be updated while Altium is open and had created a connection to the database. There are two workarounds I've found so far:
Enable Write Ahead Logging style database journal
The default database journal style, DELETE, creates a copy of the database, temporarily, writes to the database file, and, when the write is verified, deletes the temporary copy.
Write ahead logging, WAL, puts all changes in a temporary file while leaving the original copy of the database alone. Processes accessing the database parse the database file and the WAL temporary files, and return information reflecting all changes. I can confirm that writes outside of Altium are seen when doing a database refresh within Altium.
The writes stored in the WAL file are written to the original database when a checkpoint operation happens. Either when a process calls PRAGMA wal_checkpoint; or after a number of operations specified by the WAL Auto Checkpoint setting.
You can enable WAL journal mode in DB Browser's Edit Pragmas tab:
DB Browser Database Settings
The problem still isn't fixed, though. Checkpointing the database doesn't work while Altium is open. The database file is still locked from changes.
The caveat for us is that we want to backup and maintain a history of the database file in Git (yes, this is not a recommended use of Git). Writes to the journal files aren't tracked in Git, which doesn't see a change in the database file until it is checkpointed. This means that we can't push or pull from Git while Altium is open. We could track the database and journal files, but the other consequence is that a simple checkpoint with no data changes will be seen by Git as a change.
Use an alternative ODBC driver
I tested an alternative, proprietary ODBC driver from devart. When I configure Altium to connect to the SQLite database using the devart driver, DB Browser has no problems writing to the file while Altium is open, regardless of journal settings. Altium can also see those changes with a refresh operation.
Conclusion
Christian Werner's ODBC driver (as of version 0.9996) is locking the file in a manner that the devart driver does not, even while Atlium maintains a connection to the database through the driver. WAL journal mode can be a workaround for some situations.
Is necessary copy a database within a single server. Was chosen way to "File-Per-Table Tablespaces to Another Server" as it is the fastest for large databases.
The official documentation states that the database name must be the same on the source server and the destination server.
What if the source server and the destination server - this is one and the same server?
Is there any way in order to be able to copy the database files from one database to another within a server quickly.
Or somehow a way to get "File-Per-Table Tablespaces to Another Server" to ignore the name of the database?
Info server: OS: MS Windows Server 2008
MySQL Server: MySQL 5.5 or MariaDB
Tables Type: InnoDB (if MariaDB - InnoDB plugin)
Portability Considerations for .ibd Files
When you move or copy .ibd files, the database directory name must be the same on the source and destination systems. The table definition stored in the InnoDB shared tablespace includes the database name. The transaction IDs and log sequence numbers stored in the tablespace files also differ between databases.
EDITED:
I would create the backup files as suggested in the method, but would also export the schema as create table statements. After the backup I would use the rename table command to move the existing files to another database. Then Iwould recreate the schema in mz current database using the create table statements and then would import back the namespace as described.
I have an existing sqlite db file(Windows phone 8) which I use only for reading tables (Not Inserting anything)
the sqlite file gets copied to ApplicationData.Current.LocalFolder so db file are at both location.My problem is how to give security to the db file so that it should not be copied by any other user(hacker) or any application that access Local folder or Installation folder.
Is there any solution db file be copy protected without encrpting or any other simpler solution.
I am not sure if any other app can access that DB however you can always create a password protected SQLlite DB. Take a look here for more info.