Tuesday, October 2, 4:
Administration Administering MongoDB is usually a simple task. From taking backups to setting up multinode systems with replication, most administrative tasks are quick and painless.
This reflects a general philosophy of MongoDB, which is to minimize the number of dials in the system. Whenever possible, configuration is done automatically by the system rather than forcing users and administrators to tweak configuration settings.
That said, there are still some administrative tasks that require manual intervention. Here's the big picture: MongoDB is run as a normal command-line program using the mongod executable.
MongoDB features a built-in admin interface and monitoring functionality that is easy to integrate with third-party monitoring packages. MongoDB supports basic, database-level authentication including read-only users and a separate level of authentication for admin access.
There are several different ways of backing up a MongoDB system, the choice of which depends on a couple of key considerations. This chapter will go into more detail about what administrators need to know to deploy Mongo robustly in production.
A couple of the options are widely used and important to be aware of: When mongod starts up, it creates a mongod. If you attempt to start another MongoDB server using the same data directory, it will give an error: By default, mongod uses portwhich is unlikely to be used by another process besides other mongod processes.
If you try to start mongod on a port that is already being used, it will give an error: This will create the file if it does not exist, assuming you have write permissions to the directory.
It will also overwrite the log file if it already exists, erasing any older log entries. So, to start the server as a daemon listening on port and sending all output to mongodb. This might be an easy thing to miss, especially if MongoDB is being started from an init script, but the log often contains important warnings that prevent later errors from occurring.
However, you might see something like this: This is development version of MongoDB. Not recommended for production. Sat Apr 24 The second warning occurs because we are running a bit build of MongoDB.
This can be useful if you have a large set of options you want to use or are automating the task of starting up MongoDB. To tell the server to get options from a configuration file, use the -f or --config flags. The options supported in a configuration file are exactly the same as those accepted at the command line.
Doing so will cause the database to shut down without going through the steps outlined earlier and could lead to corrupt data files. This is an admin command and must be run on the admin database. The shell features a helper function to make this easier: Fortunately, MongoDB has functionality that makes monitoring easy.
Using the Admin Interface By default, starting mongod also starts up a very basic HTTP server that listens on a port 1, higher than the native driver port. All of the information presented can also be seen through the shell, but the HTTP interface gives a nice, easy-to-read overview.
To see the admin interface, start the database and go to http: Use 1, higher than the port you specified, if you used the --port option when starting MongoDB. As you can see, this interface gives access to assertion, locking, indexing, and replication information about the MongoDB server.
It also gives some more general information, like the log preamble and access to a list of available database commands.Jun 12, · ExcecSQL Error: attempt to write a readonly database If this is your first visit, be sure to check out the FAQ by clicking the link above.
You may have to register before you can post: click the register link above to proceed. It could be that the handle on the file has not yet been released when the file system task is executed. To see if this is the case, add a script task before the file system task that will wait.
SQL error: attempt to write a readonly database. Administrator アカウントでインストールしたシステムが使っている SQLite のデータベースを、管理者権限を持つ別のアカウントで操作しようとしたこと、要するに permission が無かったことがエラー発生の原因 .
@Garrett, DanielRoseman is saying that it is not good practice to use sqlite3 database in production. You have option to use postgres or mysql. DigitalOcean deployment also provides you .
New SQL Server install — confused logging on via the command line. it's the default). Specifying -U will attempt to login with a SQL login. Here's an example where I connect to a local named instance using Windows auth and run a simple command.
I speak and write English quite well. The Microsoft link I provided does not mention a. Copy the master, model, and msdb database files (both mdf and ldf) from the folder you saved them in to the correct location for the new install and remove the readonly flag from the files, and change the file ACL’s so that the SQL Service account has Full Control over the files.