7 calls to DatabaseTasks::fail() in Drupal 7

DatabaseTasks::checkEngineVersion in includes/install.inc

Check the engine version.

DatabaseTasks::connect in includes/install.inc

Check if we can connect to the database.

DatabaseTasks::runTestQuery in includes/install.inc

Run SQL tests to ensure the database can execute commands with the current user.

DatabaseTasks_pgsql::checkBinaryOutput in includes/database/pgsql/install.inc

Check Binary Output.

DatabaseTasks_pgsql::checkEncoding in includes/database/pgsql/install.inc

Check encoding is UTF8.

DatabaseTasks_pgsql::checkPHPVersion in includes/database/pgsql/install.inc

Check PHP version.

DatabaseTasks_pgsql::initializeDatabase in includes/database/pgsql/install.inc

Make PostgreSQL Drupal friendly.