PostgreSQL uses multiversion concurrency control (MVCC). SELECTs do not block modifications and vice versa. One has to take steps to achieve correct behaviour.
Notes
Refers to the column pg_proc.prokind and thus works starting from PostgreSQL 11. In the returned body of routine the query replaces each newline character with the line break (br) tag for the better readability in case the query result is displayed in a web browser. There could be multiple routines with the same name but with different parameters in the same schema (overloading). Thus, for the unique identification of the routine it is necessary to present also its parameters in addition to the schema name and routine name. The query assumes that explicit locking is needed if the routine reads data into a variable or in a subquery and as the result raises an exception or decides as to whether to modify data or not.
Type
Problem detection (Each row in the result could represent a flaw in the design)
If needed use LOCK statement to lock the entire table or SELECT … FOR UPDATE to lock specific rows.
Data Source
INFORMATION_SCHEMA+system catalog
SQL Query
SELECT
pg_namespace.nspname AS routine_schema,
pg_proc.proname AS routine_name,
pg_get_function_identity_arguments(pg_proc.oid) AS parameters,
CASE WHEN pg_proc.prokind='f' THEN 'FUNCTION'
WHEN pg_proc.prokind='p' THEN 'PROCEDURE'
WHEN pg_proc.prokind='w' THEN 'WINDOW FUNCTION' END AS routine_type,
regexp_replace( regexp_replace(pg_get_functiondef(pg_proc.oid),'<','<','g'),'[\r\n]',' ','g') AS routine_src
FROM
pg_catalog.pg_proc,
pg_catalog.pg_namespace
WHERE
pg_proc.pronamespace = pg_namespace.oid
AND pg_proc.prokind<>'a'
AND pg_proc.proname NOT IN ('f_assume_you_must_use_files', 'f_check_format_comma_separated_list', 'f_check_password', 'f_default_value_with_no_match')
AND pg_namespace.nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
AND (pg_get_functiondef(pg_proc.oid)~*'([[:space:]]*SELECT[[:space:]]|[[:space:]]*PERFORM[[:space:]])(?=[^;]*FROM[[:space:]])')
AND (pg_get_functiondef(pg_proc.oid)~*'([[:space:]]RAISE[[:space:]]+EXCEPTION|[[:space:]]INSERT[[:space:]]|[[:space:]]UPDATE[[:space:]]|[[:space:]]DELETE[[:space:]])')
AND (pg_get_functiondef(pg_proc.oid)!~*'WITH[[:space:]].*[(].*([[:space:]]INSERT[[:space:]]|[[:space:]]UPDATE[[:space:]]|[[:space:]]DELETE[[:space:]]).*[)].*')
AND (pg_get_functiondef(pg_proc.oid)!~*'([[:space:]]*LOCK[[:space:]]|[[:space:]]*FOR[[:space:]]+UPDATE)')
ORDER BY routine_schema, routine_name, parameters;
Collections
This query belongs to the following collections:
Name
Description
Find problems automatically
Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .
Categories
This query is classified under the following categories:
Name
Description
Concurrency control
Queries of this category provide information about concurrency control.
Does not work in some earlier PostgreSQL version
Queries of this category provide information that was not available in some earlier PostgreSQL version
Transactions
Queries of this catergory provide information about the use of transactions.
User-defined routines
Queries of this category provide information about the user-defined routines