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Graph/runtime-sql-substatement-observability

Pattern

Runtime SQL Instrumentation

runtime-sql-substatement-observability

A recurring observability shape where developers need to identify which specific statement inside a larger SQL block is executing, leading to plan/runtime instrumentation via auto_explain, pg_stat_* limits, or pgsentinel to pinpoint the active sub-statement.

Node Details

Public graph metadata

Updated5/1/2026

Connections

30 linked nodes

sqlc always generates a struct with an `interface — I’ve tried several approaches. Tension: I need to aggregate more complex data into a slice. Outcome: Composite and record types aren't yet supported by `sqlc`.

Tension: When I run it on dev server again but with extended events capturing (or profiler trace) running, it runs slowly just like prod. Outcome: If I pause the trace, it's immediately fast again.

facing error that `event loop is closed` — I have been working on yet another API using FastAPI and trying to write test cases for the APIs. Tension: using `asyncpg` driver/library to connect to the main db and for testcases using `aiosqlite` driver/library. Outcome: re-run the tests and report back on if it mitigates the issue.

tx.Begin + tx.Commit + tx.Rollback + set_config + core query — on each query you must write something like `set_config('')` or `SET LOCAL` first. Tension: It significantly increases amount of code required on a backend. Outcome: just query.

When I try to define the above function in a query in pgAdmin 4. Tension: I would like to come up with a way that I can define the dates I want in one place, and refer to these definitions in my actual queries. Outcome: you have to ask the database administrator to either create the function or grant the `CREATE` privilege on the schema to you.

ERROR: invalid memory alloc request size 1264582656 — CONTEXT: SQL function "st_transform_resilient" statement 1. Tension: No effect, no ERROR changes. Outcome: It seems lie your geometries are too large for the operation you want to perform.

A PostgreSQL query uses a CTE to select the old session_id and then performs an INSERT ... ON CONFLICT DO UPDATE, returning the CTE’s result as the previous value. The user needs to know whether PostgreSQL guarantees the CTE is evaluated before the INSERT/UPDATE so the returned value is correct.

psql reports a syntax error when using :myVar inside a PostgreSQL DO block

Postgres gives me no warning after the interval expired. Tension: What is the difference with triggering a check, and this check constraint? Outcome: At any rate, remove the buggy check constraint.

figure out which statement from the block is currently running in Postgres. Outcome: The simple solution is to throw in, at positions you want to know ...

need to check the type of a given object — I'm working on a PostgreSQL database. Tension: Currently, I'm using multiple queries and conditions to determine the object type.

"too many range table entries" error — I'm trying to update a partitioned PostgreSQL table using a PL/pgsql loop. Tension: it contains a self join on a large table. Outcome: If I hardcode the partition to update in the WHERE clauses, it works just fine.

Creating a generated column by using a PL/pgSQL function returned an error indicating the function returned more than one row. The function was defined to return a single int but the query inside effectively produced results for multiple rows in amp_pumpstations.

I need to find the tables involved by each function. — understand a new ERP system and the tables involved when different business functions are taking place. Tension: if we have a vehicle purchase, we need to identify table that this function has inserted/updated data. Outcome: Is there any similar tool in PostgreSQL?

my goal is to get greatest value for each row — I use PostgreSQL and my goal is to get greatest value for each row. Tension: is there a way i can know which column these values are belong to? Outcome: Expected smth like: id greatest column.

User is confused about the difference between PostgreSQL psql meta-commands \l and \d, and how to inspect template0 and template1 databases and their tables.

Grafana can query PostgreSQL via Explore, but the visual query builder shows no tables/columns in the table dropdown ("no options found").

I need to log all changes(example: granting superuser to user) in user and role, log adding new user/roles, log dropping the user/role. — This is regarding to monitor the security of our data. Tension: ensure user/roles changes are logged into table or even in log file.

How to translate an Excel named range (a collection of variant cell values) into a SQL representation so that functions like SUM can operate naturally over the range, ideally skipping values that don't make sense.

Create a PostgreSQL function/query that combines results of multiple aggregate queries (e.g., counts from different tables) into a single-row record.

Querying `pg_stat_user_indexes` gives a long list of results with 0 scans — Primary Instance being used for the (transactional) application and a Read Replica being used for analytical purposes. Tension: we are not sure how to interpret those stats regarding the replicas with enough confidence to drop some of the indexes. Outcome: Can they be different in the primary and replica?

more than one row returned by a subquery used as an expression.

this record is inserted with the date and time from my local host and not from the database server — inserting a new record into my PostgreSQL database. Tension: The time on this server is different than on my localhost.

Trying to find an equivalent in PostgreSQL/EDB for Oracle's ROWID pseudocolumn to uniquely identify a row and use it in queries.

A user with DBA privileges can grant DBA to another user inside an invoker-rights (AUTHID CURRENT_USER) PL/SQL function executed by the first user, effectively escalating the second user's privileges. The experiment shows that executing BBB's function from AAA results in BBB gaining DBA privileges.

expr-eval comes with a lot of possibilities like ternary conditions, variable declarations and so on. — I want to re-run the calculation with the incoming data on the server using PHP. Tension: there is no equivalent library for PHP. Outcome: would be the way of running such a verification?

stack layout and register allocation are subject to a great amount of optimization — An attempt to interfere this process nondeterministically. Tension: benchmarks will become useless. Outcome: nondeterministic performance.

trigger programs, check constraints, view definitions, etc. — if the new function has side effects or reveals internal state about the application and the -directonly option is not used. Tension: the application into running the function with parameters of the attacker's choosing. Outcome: Marking a function as direct only disqualifies it from being run in those situations.

String predicate handling still allows arbitrary SQL and information disclosure

the user can inspect the code. Tension: the user can inspect the code, but if it is used in the backend the users cannot see the queries or credentials. Outcome: it would be best if you did that in the backend.

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