7 calls to DatabaseTasks::fail()

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.

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