Definition of prefixInfo array structure. Rather than redefining DatabaseSchema::getPrefixInfo() for each driver, by defining the defaultSchema

abstract public Schema::addIndex($table, $name, $fields, array $spec)

Primary front-controller for the database system. This class is uninstantiatable and un-extendable. It acts to encapsulate all control and shepherding

public Schema::indexExists($table, $name)

protected Schema::getNormalizedIndexes(array $spec)

public Schema::constraintExists($table, $name)

public Schema::dropIndex($table, $name) Drop