9 files declare their use of SchemaObjectExistsException in Zircon Profile 8

DatabaseBackend.php in core/lib/Drupal/Core/Cache/DatabaseBackend.php

Contains \Drupal\Core\Cache\DatabaseBackend.

DatabaseCacheTagsChecksum.php in core/lib/Drupal/Core/Cache/DatabaseCacheTagsChecksum.php

Contains \Drupal\Core\Cache\DatabaseCacheTagsChecksum.

DatabaseStorage.php in core/lib/Drupal/Core/Config/DatabaseStorage.php

Contains \Drupal\Core\Config\DatabaseStorage.

DbImportCommand.php in core/lib/Drupal/Core/Command/DbImportCommand.php

Contains \Drupal\Core\Command\DbImportCommand.

MenuTreeStorage.php in core/lib/Drupal/Core/Menu/MenuTreeStorage.php

Contains \Drupal\Core\Menu\MenuTreeStorage.

Schema.php in core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php

Contains \Drupal\Core\Database\Driver\sqlite\Schema.

Schema.php in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

Contains \Drupal\Core\Database\Driver\pgsql\Schema.

Schema.php in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Contains \Drupal\Core\Database\Driver\mysql\Schema.

SchemaTest.php in core/modules/system/src/Tests/Database/SchemaTest.php

Contains \Drupal\system\Tests\Database\SchemaTest.