Update sql-statement-show-profiles.md to reference statement summary tables

[adamf-db]

What is changed, added or deleted? (Required)

Add a link to statement summary tables to help users looking for how to get profiling information in TiDB.

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[dveeden]

We could try to come up with a query that mimics SHOW PROFILES.

mysql> SELECT SLEEP(5);
+----------+
| SLEEP(5) |
+----------+
|        0 |
+----------+
1 row in set (5.01 sec)

mysql> SELECT QUERY_SAMPLE_TEXT,AVG_LATENCY FROM information_schema.statements_summary;
+---------------------------------------------------------------------------------+-------------+
| QUERY_SAMPLE_TEXT                                                               | AVG_LATENCY |
+---------------------------------------------------------------------------------+-------------+
| SELECT SLEEP(5)                                                                 |  5000863698 |
| SELECT QUERY_SAMPLE_TEXT,AVG_LATENCY FROM information_schema.statements_summary |      721116 |
| select @@version_comment limit 1                                                |      499801 |
| SELECT * FROM information_schema.statements_summary                             |     1243165 |
+---------------------------------------------------------------------------------+-------------+
4 rows in set (0.00 sec)

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-18 21:58:13.191518824 +0000 UTC m=+479534.755816530: ☑️ agreed by dveeden.
• 2024-01-22 02:26:24.414342661 +0000 UTC m=+754825.978640366: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot]

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[qiancai]

/retest