\chapter{Using Bacula catalog to grab information}
\label{UseBaculaCatalogToExtractInformationChapter}
\index[general]{Statistics}

Bacula catalog contains lot of information about your IT infrastructure, how
many files, their size, the number of video or music files etc. Using Bacula
catalog during the day to get them permit to save resources on your servers.

In this chapter, you will find tips and information to measure bacula
efficiency and report statistics.

\section{Job statistics}
If you (or probably your boss) want to have statistics on your backups to
provide some \textit{Service Level Agreement} indicators, you could use a few
SQL queries on the Job table to report how many:

\begin{itemize}
\item jobs have run
\item jobs have been successful
\item files have been backed up
\item ...
\end{itemize}

However, these statistics are accurate only if your job retention is greater
than your statistics period. Ie, if jobs are purged from the catalog, you won't
be able to use them. 

Now, you can use the \textbf{update stats [days=num]} console command to fill
the JobHistory table with new Job records. If you want to be sure to take in
account only \textbf{good jobs}, ie if one of your important job has failed but
you have fixed the problem and restarted it on time, you probably want to
delete the first \textit{bad} job record and keep only the successful one. For
that simply let your staff do the job, and update JobHistory table after two or
three days depending on your organization using the \textbf{[days=num]} option.

These statistics records aren't used for restoring, but mainly for
capacity planning, billings, etc.

The Bweb interface provides a statistics module that can use this feature. You
can also use tools like Talend or extract information by yourself.

The {\textbf Statistics Retention = \lt{}time\gt{}} director directive defines
the length of time that Bacula will keep statistics job records in the Catalog
database after the Job End time. (In \texttt{JobHistory} table) When this time
period expires, and if user runs \texttt{prune stats} command, Bacula will
prune (remove) Job records that are older than the specified period.

You can use the following Job resource in your nightly \textbf{BackupCatalog}
job to maintain statistics.
\begin{verbatim}
Job {
  Name = BackupCatalog
  ...
  RunScript {
    Console = "update stats days=3"
    Console = "prune stats yes"
    RunsWhen = After
    RunsOnClient = no
  }
}
\end{verbatim}
