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The Logger class allows us to use generic logging methods for situations in which the level of logging is not predefined. The following are generic logging methods: public void log(Priority p, Object message); public void log(Priority p, Object message, Throwable t); public void log(String fqcn, Priority p, Object message, Throwable t); The first two methods are obvious in the sense that they accept the logging level and the message object as the argument, and optionally accept a java.lang.Throwable instance. The last method is the most generic one, and it takes an extra argument, fqcn, which is the fully

You also incur a performance cost when SQL Server returns the data to the calling application because it uses the tabular data stream (TDS) protocol, which is not as optimal as the native data transfer capabilities inherent in the file system You also need to consider how storing files in a database will affect your database connections and database server load Remember, if someone is downloading a 200MB file, then you ll need an open connection for the duration of the download This can be problematic if you have connection-based licensing for your SQL Server, and it can cause performance issues if you end up with too many connections open at once Although the file system outperforms database file storage, some factors can narrow the performance gap If you are working with relatively small files, you ll see less of a performance hit.

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Smaller files use few database pages so they are easier to reassemble, and they won t hold database connections open as long as larger files Infrequently accessed files also make for better performance because the biggest hits you incur happen when files are saved and retrieved You can also always upgrade the hardware in your database server if you re not getting the kind of performance you desire..

Database backups automatically include files stored in the database because those files are treated just like any other database data. This makes backing up files stored in a database easier in the sense that you do not have to set up any additional routines to back up those files. Of course, most backup applications can easily backup files on the file system as well, so it s not an overly compelling reason to choose one way or the other. The same goes for database replication. Files in a database are automatically replicated just like any other data in a database, but it isn t too difficult to set up file replication between two servers.

qualified name of the caller class. The generic logging methods are rarely used directly from an application. But any wrapper class in the Logger class may use these generic methods internally to print logging information. All the preceding methods accept as a parameter a java.lang.Object, which is the message to be printed. This can represent any arbitrary object. The Logger object passes this object to the associated Appender object(s), and Appender objects in turn pass the message to the Layout objects. The Layout objects will interpret the object and render it into a human-readable format. I will discuss this process with the help of org.apache.log4j.or.ObjectRenderer in 5.

Storing files in a database requires a bit more coding than just saving files directly to the file system. You have to write more code to upload the file, and you have to write all the code to retrieve the file from the database and send it back to the user. You may also find yourself coding workarounds for database file storage because components naturally assume files are stored on the file system. Programmatic complexity, although a bit more work, gives you complete control over serving files. This means that you can create advanced security and authorization schemes to control which users have access to what files.