PostgreSQL Query Catalog

Find the number of rules in a database, excluding the rules that are associated with system catalog tables and rules that are created to support views. Rules can be used to maintain data integrity in a database by causing rejection of incorrect insertions and updates. Therefore, the number of rules in a database gives some indications about the state of enforcing constraints at the database level.

Find the number of rules in a database in different schemas, excluding the rules that are created to support views. Rules can be used to maintain data integrity in a database by causing rejection of incorrect insertions and updates. Therefore, the number of rules in a database gives an indication about the state of enforcing constraints at the database level.

Find the number of system-generated constraint names by constraint type. Names should follow the same style. If there is a mix of system-generated and user-defined names, then the style is most probably different.

Find the number of system-generated constraint names by constraint type. Names should follow the same style. If there is a mix of system-generated and user-defined names, then the style is most probably different.

Find the number of table constraints with the cardinality bigger than one. Find the number, based on the cardinality, constraint type, and cardinality+constraint type.

Find the number of tables (base, foreign, and derived) in different schemas.

Find the number of textual base table columns, the number of optional textual base table columns (permit NULLs), and the number of mandatory textual base table columns (do not permit NULLs).

Find the number of user-defined non-trigger routines based on their schema, language, and routine type. The routines can be used to implement virtual data layer. Thus the queriy gives some indications about the possible extent of the layer.

Find the number of user-defined non-trigger routines based on their schema, security type, and being deterministic. The routines can be used to implement virtual data layer. Thus the queriy gives some indications about the possible extent of the layer.

Find the number of user-defined non-trigger routines by the number of input parameters.

Find the number of user defined triggers by action orientation (ROW, STATEMENT), action timing (BEFORE, AFTER, INSTEAD OF), and event type (INSERT, UPDATE, DELETE) and their combinations.

Find the number of views and materialized views that have a column with the xid type and the number of routines that contain a UPDATE or a DELETE statement that search condition refers to the xmin column. If one uses optimistic approach for dealing with the concurrent modifications of data, then xmin values should be presented by views and used in routines that modify or delete rows.

Find the number of views, the number of views with and without security barrier setting, and the names of views with and without the security barrier setting.

Find the patterns of the names of columns of simple primary keys. Make sure that the naming is consistent. Ideally, the names should indicate as to whether the column is a surrogate or a natural key column. PostgreSQL 14 added primary keys, unique constraints, and foreign keys to system catalogs. Thus the query was modified to exclude the results from the system catalog.

Find the patterns of the names of trigger and rule names. Make sure that the naming is consistent.

Find the privileges to use the database. c - CONNECT; C - CREATE; T - TEMPORARY.

Find the size of base tables without indexes, size of the indexes of the table, total size of the table (including its indexes) and percentage of the index size from the total size. If the size of indexes of a table is relatively high, then check as to whether all the indexes are needed.

Find the TOP 3 longest (identifiers) names of user-defined objects.

Find the total number of columns in the different types of tables as well as average number of columns in the tables as well as minimal and maximal number of columns.

Find the total number of columns with a default value as well as the number of columns with different kinds of default values (the number of columns where the default is used to implement surrogate key, the number of columns where the default is not used to implement surrogate key, the number of columns with a static default value, the number of columns with a dynamic default value).