400 - BAD_REQUEST | INVALID_REQUEST | The incoming request contains invalid data. |
| INVALID_MASTERSLAVE_APP | The request contains invalid primary or secondary application IDs when creating or updating an instance. |
| ERROR_NON_EXISTENT_APP_ID | The application ID does not exist. The instance could not be connected with an application. |
| ERROR_APP_REGION | The App Engine app is in a different geographical region. |
| INVALID_OPERATION | The operation isn't valid for this instance. |
| PROJECT_NAME_MISMATCH | The operation failed to create the target instance because it has a different project name from the source instance name specified. |
| ERROR_GCE_ZONE_REGION | The Compute Engine zone is in a different geographical region. |
| ERROR_UNRECOGNIZED_GCE_ZONE | The request contains an unrecognized Compute Engine zone. |
| ERROR_BOTH_GCE_ZONE_GAE_APP_SPECIFIED | The Compute Engine zone and the App Engine application ID are both specified for location preference when creating or updating an instance. The operation only uses one or the other. |
| ERROR_SSL_CERTIFICATE_COMMON_NAME | The common name can contain only alphanumeric characters, periods, dashes, spaces, and underscores. Spaces can't appear at the beginning or the end. The length can't exceed 64 characters. |
| ERROR_SSL_CERTIFICATE_COMMON_NAME_ALREADY_EXISTS | The operation failed to generate a client certificate because another certificate with the same common name exists. |
| ERROR_BINLOG_COORDINATES_VERIFICATION | The binary log coordinates used for cloning an instance are invalid in relation to the source instance. |
| ERROR_BINLOG_INVALID_FILE_NAME | The binary log filename used for cloning an instance is either empty or invalid. |
| ERROR_BINLOG_INVALID_OFFSET | The binary log position used for cloning an instance is either empty or invalid. |
| ERROR_BINLOG_NOT_ENABLED | The requested operation isn't allowed with an instance that doesn't have a binary log or binary logging enabled. |
| ERROR_INVALID_CLONE_SOURCE_PROJECT | The project for the source Cloud SQL instance doesn't match the project on the request URL. |
| ERROR_INVALID_CLONE_DESTINATION_PROJECT | The project for the destination Cloud SQL instance doesn't match the project on the request URL. |
| ERROR_BACKUP_NOT_FOUND | The system can't find a successful backup. A backup is required to carry out the operation. |
| ERROR_ADDING_ON_PREMISES_CONFIG | The system can't add the on-premises configuration for the given instance type. |
| ERROR_ON_PREMISES_INSTANCE_INVALID_OPERATION | The requested operation isn't valid for an on-premises instance. |
| ERROR_ON_PREMISES_INSTANCE_WITH_NO_HOST_PORT | An on-premises instance needs to be configured with a host:port. |
| ERROR_ON_PREMISES_INSTANCE_WITH_SSL_CONFIG | An on-premises instance can't use the SSL configuration. |
| ERROR_REPLICA_CONFIGURATION_MISSING_MASTER_INSTANCE_NAME | The replica configuration doesn't contain the master instance name to use for replication. |
| ERROR_REPLICA_CONFIGURATION_MISSING_DUMP_FILE_PATH | The replica configuration doesn't contain the dump file path when replicating from an on-premises master. |
| ERROR_REPLICA_CONFIGURATION_MISSING_USERNAME | The replica configuration doesn't contain the username (to use for the replication connection) when replicating from an on-premises master. |
| ERROR_REPLICA_CONFIGURATION_MISSING_PASSWORD | The replica configuration doesn't contain the password (to use for the replication connection) when replicating from an on-premises master. |
| ERROR_READ_REPLICA_SOURCE_TARGET_REGION_MISMATCH | The read replica must be in the same region as that of the source instance. |
| ERROR_INVALID_PROJECT | The project specified in the request is invalid. |
| ERROR_MATCHING_SOURCE_DESTINATION_INSTANCE_NAME | The instance being created can't have the same name as the source instance. |
| ERROR_INVALID_READ_REPLICA_PROJECT | The project containing the read replica doesn't match the project on the request URL. |
| ERROR_READ_REPLICA_INVALID_OPERATION | The requested operation isn't valid for a read replica. |
| ERROR_REPLICA_INVALID_OPERATION | The requested operation isn't valid for a read replica. |
| ERROR_REPLICATION_MASTER_INVALID_OPERATION | The requested operation isn't valid for a replication master instance. |
| ERROR_DISALLOWED_ENABLING_BACKUPS_FOR_READ_REPLICA | A backup can't be enabled for read replicas. |
| ERROR_INVALID_READ_REPLICA_ACTIVATION_POLICY | The read replica is not specified as 'ALWAYS'. |
| ERROR_INVALID_INSTANCE_TYPE_CLOUDSQL | A Cloud SQL instance that isn't a replica can't have an associated master instance name. |
| ERROR_INVALID_INSTANCE_TYPE_READ_REPLICA | A read replica must have an associated master instance. |
| ERROR_INVALID_INSTANCE_PROPERTY_DATABASE_REPLICATION_ENABLED | The database replication setting is only used on a read replica. |
| ERROR_DISALLOWED_DISABLED_DATABASE_REPLICATION_ON_REPLICA_CREATION | The database replication flag must be enabled when creating a read replica. |
| ERROR_EXPORT_UNKNOWN_FILE_TYPE | The export file type is unknown. |
| ERROR_EXPORT_SQL_DATABASE_COUNT | The operation requires that you specify exactly one database and one table when exporting a SQL file. |
| ERROR_EXPORT_CSV_DATABASE_COUNT | The operation requires that you specify, at most, one database when exporting a CSV file. |
| ERROR_IMPORT_UNKNOWN_FILE_TYPE | The import file type is unknown. |
| ERROR_DATABASE_TYPE_UNSUPPORTED_FOR_REPLICATION | The replication and cloning operations aren't supported for this database type. |
| ERROR_DATABASE_TYPE_UNSUPPORTED_FOR_READ_REPLICA | The read replica isn't supported for this database type. |
| ERROR_READ_REPLICA_INCOMPATIBLE_DATABASE_TYPES | The database versions for the source and target instances are incompatible for replication. |
| ERROR_INSTANCES_INCOMPATIBLE_FOR_REPLICATION | The source and target instances are incompatible for replication. |
| ERROR_UNSUPPORTED_PUBLIC_KEY | The provided public key uses an invalid or unsupported format. |
| ERROR_INVALID_BACKUP_RUN_STATUS | The backup run status isn't valid for the given request. |
| ERROR_FAILOVER_REPLICA_ALREADY_EXISTS | A failover replica already exists. |
| ERROR_INVALID_FAILOVER_REPLICA_OPERATION | The requested operation isn't allowed for a failover replica. |
| ERROR_FAILOVER_REPLICA_AND_MASTER_IN_SAME_ZONE | The failover replica must be in a different zone than the master instance. |
| ERROR_NO_FAILOVER_REPLICA | The requested operation requires a failover replica. |
| ERROR_EXPORT_CSV_SELECT_QUERY_SIZE_EXCEED_LIMIT | The Select query exceeds the size limit for the CSV export operation. |
| ERROR_INVALID_HA_MASTER_OPERATION | The requested operation isn't valid for an HA master instance. |
| ERROR_INVALID_HAS_REPLICA_OPERATION | The requested operation isn't valid for an instance that has a replica. |
| ERROR_INSTANCE_NAME_CONFLICT | There is an existing instance with the given name. |
| ERROR_BACKUP_SIZE_EXCEEDS_INSTANCE_SIZE | Restore from backup can't be done to the instance with storage size smaller than the backup size. |
| ERROR_INVALID_PRIMARY_IP_RANGE | The IP address of the primary database is in an unsupported IP address range. Non-RFC 1918 IPs are not supported. To set up replicas, change the IP address of the primary server. |
| ERROR_INVALID_REPLICA_REGION_TOPOLOGY | Requested operation would cause circular region dependency in replica chain. |
| ERROR_REPLICA_DEPTH_LIMIT_EXCEEDED | Requested operation would cause exceeding the limit of 4 levels on the depth of cascading replicas. |
| ERROR_DISALLOWED_UPDATING_EXTERNAL_SERVER_REPLICA_REPLICATION_STATE | Updating the replication state setting of an external server replica instance isn't allowed. Use the stopReplica or startReplica API instead. |
| ERROR_DISALLOWED_UPDATING_EXTERNAL_SERVER_REPLICA_REPLICATION_STATE | Updating the replication state setting of an external server replica instance isn't allowed. Use the stopReplica or startReplica API instead. |
| ERROR_EXTERNAL_SERVER_REPLICA_GTID_MODE | External server replica must have gtid_mode=ON in order to have a read replica. |
| ERROR_PITR_BACKUP_RUN_NOT_DELETABLE | This upgrade backup cannot be deleted because it's within the point-in-time recovery retention period for the instance. You can delete it earlier if you adjust the retention period or disable point-in-time recovery. |
| ERROR_PROTECTED_INSTANCE_DELETION_FAILURE | The instance is protected. Please disable the deletion protection and try again. To disable deletion protection, update the instance settings with deletionProtectionEnabled set to false. |
| ERROR_READ_REPLICA_UNDER_EXTERNAL_SERVER_REPLICA_NOT_SYNCED | To have a read replica, there must be an initial sync completed on the external server replica. |
