7 calls to DatabaseTasks::fail()

DatabaseTasks::checkEngineVersion in drupal-7.x/includes/install.inc
Check the engine version.
DatabaseTasks::connect in drupal-7.x/includes/install.inc
Check if we can connect to the database.
DatabaseTasks::runTestQuery in drupal-7.x/includes/install.inc
Run SQL tests to ensure the database can execute commands with the current user.
DatabaseTasks_pgsql::checkBinaryOutput in drupal-7.x/includes/database/pgsql/install.inc
Check Binary Output.
DatabaseTasks_pgsql::checkEncoding in drupal-7.x/includes/database/pgsql/install.inc
Check encoding is UTF8.
DatabaseTasks_pgsql::checkPHPVersion in drupal-7.x/includes/database/pgsql/install.inc
Check PHP version.
DatabaseTasks_pgsql::initializeDatabase in drupal-7.x/includes/database/pgsql/install.inc
Make PostgreSQL Drupal friendly.