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Tracker SPARQL Library Reference Manual | ![]() |
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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.
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.
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/
Backends for libtracker-sparql are dynamically loaded at
run time. Currently there are only two backends which are
Tracker caches database statements which occur frequently to make subsequent repeat queries much faster. The cache size is set to 100 by default for each type (select and update queries). This must be at least 2 as a minimum, any less and a value of 3 is used instead. The number represents the number of cached statements to keep around. This environment variable is used mainly for testing purposes.
Tracker's store also has environment variables to control this behavior, see the manual pages for tracker-store regarding TRACKER_STORE_SELECT_CACHE_SIZE and TRACKER_STORE_UPDATE_CACHE_SIZE.
Historically, all queries would go through tracker-store and all requests would be logged according to the verbosity set in tracker-store.cfg (see manual pages for tracker-store.cfg). Since libtracker-sparql may circumvent tracker-store 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 0 to 3, 0=errors, 1=minimal, 2=detailed, 3=debug. By default it is 0.
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.
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.