Writing files papers in different subdirectories

Hello

Is it possible to write logs in different subdirectories. I want to write records of type or class. For example, put the records of dogs in a directory, cats in another directory. But the same environment, an Animal as the main environment. Can you give me an example of code for this example if possible.

Thanks in advance.

Hello

It would be interesting for us, first, make sure that there is a clear understanding of how I store data. I use an approach based on the journal to store data. There is no separate database file, that is, records database and logs are stored together transaction is a single sequential journal composed of several log files. These files of newspapers I are single addition with inserts of records, deletions and updates added at the end of the current log file (logs files I are the NNNNNNNN.jdb files). More information here.

There is a means of distributing the files of newspapers I in several directories that allows to improve the throughput by distributing the disk i/o on multiple disks or file systems. See the documentation section of several subdirectories environment . However, this does not mean that your databases, locked in the files of newspapers I, will be equally distributed in all of those directories.

In order to separate data sets as you wish, by type or class (Animal/dog, Pet/Cat etc.), you can use several environments I - each environment will correspond to the type of animal data that you will store. However, there are important disadvantage to the use of multiple environments; a single transaction cannot span/include changes in more than one environment.
You also need to consider using a cache shared for these multiple environments, in order to make more efficient use of memory rather than using private caches.
See the sections of documentation environments and configuration of a Cache shared for several environments . Below is a snippet of code showing how you would open multiple environment using a shared cache:

...
// Environment references as needed (dog, cats, horses etc)
Environment dogEnv = null;
Environment catEnv = null;
Environment horseEnv = null;
...

// Open the Animal subtypes environments (the directories needs to exist)
try {
     EnvironmentConfig envConfig = new EnvironmentConfig();
     envConfig.setAllowCreate(true);
     envConfig.setSharedCache(true);
     ...

     dogEnv = new Environment(new File("/test/animal/dog"), envConfig);
     catEnv = new Environment(new File("/test/animal/cat"), envConfig);
     horseEnv = new Environment(new File("/test/animal/horse"), envConfig);
     ...
} catch (DatabaseException dbe) {
     ...
}

Kind regards
Andrei

Tags: Database

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