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<title>Environment Variables: Tracker SPARQL Library Reference Manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="tracker-overview-environment-variables"></a>Environment Variables</h2></div></div></div>
<p>
There are a number of environment variables which affect the way
that the libtracker-sparql library will do its work. Those
environment variables are described here.
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<span class="emphasis"><em>TRACKER_USE_LOG_FILES</em></span><p>
Don't just log to stdout and stderr, but to log files too
which are kept in $HOME/.local/share/tracker/. This came
into effect in 0.15.3 and 0.16.0. After this version of
Tracker, logging to file (usually useful for debugging)
can only be done by declaring this environment variable.
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_USE_CONFIG_FILES</em></span><p>
Don't use GSettings, instead use a config file similar to
how settings were saved in 0.10.x. That is, a file which
is much like an .ini file. These are saved to
$HOME/.config/tracker/
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_SPARQL_BACKEND</em></span><p>
Backends for libtracker-sparql are dynamically loaded at
run time. Currently there are only two backends which are
<GTKDOCLINK HREF="overview-tracker-connection-methods">explained
more closely</GTKDOCLINK> in the previous chapter. In short,
this environment variable gives the client the ability to
directly mandate which backend they want to use. The
value can be set to either "direct" or "bus". A "direct"
value means the direct access approach will be forced. A
"bus" value means a D-Bus / IPC approach will be forced.
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_SPARQL_CACHE_SIZE</em></span><p>
Tracker caches database statements which occur frequently to make
subsequent repeat queries much faster. The cache size is
set to <span class="emphasis"><em>100</em></span> by default for each type
(select and update queries). This must be at
least <span class="emphasis"><em>2</em></span> as a minimum, any less and a
value of <span class="emphasis"><em>3</em></span> is used instead. The
number represents the number of cached statements to keep
around. This environment variable is used mainly for
testing purposes.
</p>
<p>
Tracker's store also has environment variables to control
this behavior, see the manual pages
for <span class="emphasis"><em>tracker-store</em></span>
regarding <span class="emphasis"><em>TRACKER_STORE_SELECT_CACHE_SIZE</em></span>
and <span class="emphasis"><em>TRACKER_STORE_UPDATE_CACHE_SIZE</em></span>.
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_VERBOSITY</em></span><p>
Historically, all queries would go
through <span class="emphasis"><em>tracker-store</em></span> and all
requests would be logged according to the verbosity set
in <span class="emphasis"><em>tracker-store.cfg</em></span> (see manual
pages for <span class="emphasis"><em>tracker-store.cfg</em></span>). Since
libtracker-sparql may
circumvent <span class="emphasis"><em>tracker-store</em></span> if using the
direct access backend, this environment variable was added
to let clients choose the log level. The same values apply
to all other processes which have logging and a
configuration to control it. Values range
from <span class="emphasis"><em>0</em></span> to <span class="emphasis"><em>3</em></span>,
0=errors, 1=minimal, 2=detailed, 3=debug. By default it
is <span class="emphasis"><em>0</em></span>.
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_PRAGMAS_FILE</em></span><p>
Tracker has a fixed set of PRAGMA settings for creating its
SQLite connection. With this environment variable pointing to
a text file you can override these settings. The file is a
\n separated list of SQLite queries to execute on any newly
created SQLite connection in tracker-store.
</p>
</li>
<li class="listitem">
<span class="emphasis"><em>TRACKER_DISABLE_MEEGOTOUCH_LOCALE</em></span><p>
If Tracker is compiled with meegotouch locale management support,
setting this variable in the environment will disable retrieving
the locale from GConf, and the standard locale settings will be
used instead.
</p>
</li>
</ul></div>
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