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PG-186: Add support to monitor query execution plan.

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This requires refactoring of code to add this functionality. Along with
that this patch contains regression test cases.
This commit is contained in:
Ibrar Ahmed
2021-03-12 18:55:12 +00:00
parent 8f69daa5dd
commit 066162c3f6
34 changed files with 10234 additions and 1173 deletions
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50
docs/USER_GUIDE.md
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@@ -400,3 +400,53 @@ postgres=# SELECT queryid, top_queryid, query, top_query FROM pg_stat_monitor;
762B99349F6C7F31 | 3408CA84B2353094 | SELECT (select $1 + $2) | select add2($1,$2)
(3 rows)
```
#### Monitor Query Execution Plan.
```sql
postgres=# SELECT substr(query,0,50), query_plan from pg_stat_monitor limit 10;
substr | query_plan
---------------------------------------------------+---------------------------------------------------------------------------------------------------------------
select o.n, p.partstrat, pg_catalog.count(i.inhpa | Limit +
| -> GroupAggregate +
| Group Key: (array_position(current_schemas(true), n.nspname)), p.partstrat +
| -> Sort +
| Sort Key: (array_position(current_schemas(true), n.nspname)), p.partstrat +
| -> Nested Loop Left Join +
| -> Nested Loop Left Join +
| -> Nested Loop +
| Join Filter: (c.relnamespace = n.oid) +
| -> Index Scan using pg_class_relname_nsp_index on pg_class c +
| Index Cond: (relname = 'pgbench_accounts'::name) +
| -> Seq Scan on pg_namespace n +
| Filter: (array_position(current_schemas(true), nspname) IS NOT NULL) +
| -> Index Scan using pg_partitioned_table_partrelid_index on pg_partitioned_table p+
| Index Cond: (partrelid = c.oid) +
| -> Bitmap Heap Scan on pg_inherits i +
| R
SELECT abalance FROM pgbench_accounts WHERE aid = | Index Scan using pgbench_accounts_pkey on pgbench_accounts +
| Index Cond: (aid = 102232)
BEGIN; |
END; |
SELECT substr(query,$1,$2), query_plan from pg_st |
SELECT substr(query,$1,$2),calls, planid,query_pl | Limit +
| -> Subquery Scan on pg_stat_monitor +
| -> Result +
| -> Sort +
| Sort Key: p.bucket_start_time +
| -> Hash Join +
| Hash Cond: (p.dbid = d.oid) +
| -> Function Scan on pg_stat_monitor_internal p +
| -> Hash +
| -> Seq Scan on pg_database d +
| SubPlan 1 +
| -> Function Scan on pg_stat_monitor_internal s +
| Filter: (queryid = p.top_queryid)
select count(*) from pgbench_branches | Aggregate +
| -> Seq Scan on pgbench_branches
UPDATE pgbench_tellers SET tbalance = tbalance + |
vacuum pgbench_tellers |
UPDATE pgbench_accounts SET abalance = abalance + |
(10 rows)
```