Case Assignment: Database Directories

Case Assignment: Database Directories

Case Assignment: Database Directories

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Unit 2 discussion Database Search Choose a topic related to health that has meaning to your personal health, interests, and well-being. This may be a disease, such as diabetes, or a healthy fitness activity. Conduct a database search comparing one of the following database directories with Google Scholar. CINAHL and Google Scholar PubMed and Google Scholar Explain how you were able to narrow down the number of article hits you had initially, and present within your post a summary of the credible article you chose as your resource. How do you know your article choice is credible? Which database do you prefer and why? How will using a database search facilitate your scholarly work; nursing work (evidence-based practice); and personal self-development?

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The database directory
A Derby database is stored in files that live in a directory of the same name as the database. Database directories typically live in system directories.

Note: An in-memory database does not use the file system, but the size limits listed in the table later in this topic still apply. For some limits, the maximum value is determined by the available main memory instead of the available disk space and file system limitations.
A database directory contains the following, as shown in the following figure.

log directoryContains files that make up the database transaction log, used internally for data recovery (not the same thing as the error log).
seg0 directoryContains one file for each user table, system table, and index (known as conglomerates).
service.properties fileA text file with internal configuration information.
tmp directory(might not exist.) A temporary directory used by Derby for large sorts and deferred updates and deletes. Sorts are used by a variety of SQL statements. For databases on read-only media, you might need to set a property to change the location of this directory. See “Creating Derby Databases for Read-Only Use”.
jar directory(might not exist.) A directory in which jar files are stored when you use database class loading.
Read-only database directories can be archived (and compressed, if desired) into jar or zip files. For more information, see Accessing a read-only database in a zip/jar file.

The following figure shows the files and directories in the Derby database directories that are used by the Derby software.