The list of all the queries

Explicit locking is missing

Query goal: PostgreSQL uses multiversion concurrency control (MVCC). SELECTs do not block modifications and vice versa. One has to take steps to achieve correct behaviour.
Notes about the query: 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.
Query type: Problem detection (Each row in the result could represent a flaw in the design)
Query reliability: Low (Many false-positive results)
Query license: MIT License
Fixing suggestion: 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: Click on query to copy it

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),'<','&lt','g'),'[\r\n]','<br>','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 where the query belongs to

Collection nameCollection description
Find problems automaticallyQueries, 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 where the query belongs to

Category nameCategory description
Concurrency controlQueries of this category provide information about concurrency control.
Does not work in some earlier PostgreSQL versionQueries of this category provide information that was not available in some earlier PostgreSQL version
TransactionsQueries of this catergory provide information about the use of transactions.
User-defined routinesQueries of this category provide information about the user-defined routines

Reference materials for further reading

Reference
https://devcenter.heroku.com/articles/postgresql-concurrency

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