| 441 | The number of referencing base tables | Find how many base tables reference to a base table by using foreign keys. The more references there are the more impact the change of the table could have to the overall system. | Sofware measure | system catalog base tables only | 2021-03-12 11:02 | MIT License | |
| 442 | The number of tables based on the number of columns | Find how many tables with a certain range of the number of columns there are in the database. | Sofware measure | INFORMATION_SCHEMA+system catalog base tables | 2021-03-25 11:17 | MIT License | |
| 443 | Identifiers that explicitly say that they carry no meaning | Find identifiers that explicitly say that they carry no meaning. Such identifier is called "unnamed" or "anonymous". | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-03-17 11:06 | MIT License | |
| 444 | Incorrect characterization of a user-defined routine as an "immutable" routine | Find immutable routines that contain SELECT statements from a database (including SELECT .. FOR UPDATE), INSERT, UPDATE, DELETE, or LOCK statement. The DBMS should get a correct background information about the behaviour of a routine. Immutable routines should not have side effects and should also not ask data from a database because it could change over time. Immutable routines cannot lock tables or its specific rows. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-11-05 14:08 | MIT License | |
| 445 | A state machine is implemented with the help of a state classifier table | Find implementations of state machines that use a state classifier table. | General | system catalog base tables only | 2023-11-26 15:39 | MIT License | |
| 446 | A state machine is implemented with the help of an enumeration type | Find implementations of state machines that uses an enumeration type. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-26 15:39 | MIT License | |
| 447 | Perhaps a state machine is implemented with timestamp columns | Find implementations of state machines that uses a set of columns with a timestamp type. | Problem detection | INFORMATION_SCHEMA only | 2021-03-26 21:04 | MIT License | |
| 448 | Perhaps a state machine is implemented with Boolean columns | Find implementations of state machines that uses a set of one or more Boolean columns. These columns could have the type Boolean or could probably (based on the column name and non-participation in a foreign key) contain values that represent truth values. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 13:22 | MIT License | |
| 449 | ON DELETE SET NULL is probably missing | Find implementations of the adjacency list design pattern, where the corresponding foreign key columns are optional but the foreign key constraint does not have ON DELETE SET NULL compensating action. Implement adjacency list correctly. | Problem detection | system catalog base tables only | 2021-02-25 17:29 | MIT License | |
| 450 | Frequency of column name lengths based on the table type | Find in case of base tables, materialized views, and views the number of columns based on the length of the column name. | Sofware measure | INFORMATION_SCHEMA+system catalog base tables | 2022-11-22 14:43 | MIT License | |
| 451 | Frequency of table name lengths based on the table type | Find in case of base tables, materialized views, and views the number of tables based on the length of the table name. | Sofware measure | INFORMATION_SCHEMA+system catalog base tables | 2022-11-23 01:09 | MIT License | |
| 452 | Table inheritance (path view) | Find in case of each base table that participates in a table inheritance hierarchy the path to the table from the top-level table. Use table inheritance carefully because, for instance, certain constraints are not inherited and must be redefined on child tables. Also make sure that the identifier of each child table in an inheritance hierarchy is a hyponym of the identifier of its parent table. | General | system catalog base tables only | 2022-11-13 16:13 | MIT License | |
| 453 | ON UPDATE CASCADE is perhaps missing (based on the compensating actions of other foreign key constraints) | Find inconsistencies of using ON UPDATE CASCADE in case of foreign key constraints. An example of inconsistency is that there are two foreign key constraints in different tables that refer to the same table and its candidate key. One of the constraints has ON UPDATE CASCADE compensating action one does not. ON UPDATE CASCADE usage should be consistent, otherwise it does not allow us to change key values in the primary table. More generally, there is a set of foreign key constraints F that refer to a candidate key of table T. It cannot be the case that a proper non-empty subset of these foreign keys have ON UPDATE CASCADE compensatory action. Either all the constraints in F should have it or none of it should have it (depending on circumstances). | Problem detection | system catalog base tables only | 2022-04-30 18:39 | MIT License | |
| 454 | Recursive relationships with the same source and target | Find incorrectly implemented adjacency lists. | Problem detection | system catalog base tables only | 2021-02-25 17:30 | MIT License | |
| 455 | Textual columns that have a secondary index but the operator class for the column does not support pattern matching | Find indexed textual columns where the indexing does not consider the possibility of pattern-based search. Such columns do not have an index where the used operator class makes the index suitable for use by queries involving pattern matching expressions. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-07 11:52 | MIT License | |
| 456 | Identical indexes | Find indexes that are identical, i.e., have the same properties, including uniqueness. The query considers all types of indexes, including indexes that have been automatically created to support a constraint and function-based indexes. | Problem detection | system catalog base tables only | 2021-02-25 17:30 | MIT License | |
| 457 | Unused indexes | Find indexes that are not used by the DBMS. Remember that indexes are not a "free lunch" and they slow down the processes of updating data. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-01-19 00:23 | MIT License | |
| 458 | Unused indexes (2) | Find indexes that are not used by the DBMS. Remember that indexes are not a "free lunch" and they slow down the processes of updating data. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-01-19 00:28 | MIT License | |
| 459 | Names of indexes that do not contain the table name | Find indexes that do not support a declarative constraint and that are perhaps badly named. Table names make the names more expressive and user-friendly. | Problem detection | system catalog base tables only | 2023-01-10 18:13 | MIT License | |
| 460 | Redundant indexes | Find indexes that may be redundant. In addition to identical indexes it also considers indexes that cover the same columns and have the same properties except uniqueness. The query considers all types of indexes, including indexes that have been automatically created to support a constraint and function-based indexes. | Problem detection | system catalog base tables only | 2021-02-25 17:29 | MIT License | |