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high-concurrency-best-practices: improve example #6808

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Apr 14, 2022
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high-concurrency-best-practices: improve example #6808

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high-concurrency-best-practices: improve example
dveeden Nov 12, 2021
c19ad74
Merge remote-tracking branch 'upstream/master' into hotspot_example
dveeden Dec 8, 2021
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20 changes: 19 additions & 1 deletion best-practices/high-concurrency-best-practices.md
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Expand Up @@ -65,7 +65,25 @@ This table is simple in structure. In addition to `id` as the primary key, no se
{{< copyable "sql" >}}

```sql
INSERT INTO TEST_HOTSPOT(id, age, user_name, email) values(%v, %v, '%v', '%v');
SET SESSION cte_max_recursion_depth = 1000000;
INSERT INTO TEST_HOTSPOT
SELECT
n, -- ID
RAND()*80, -- Number between 0 and 80
CONCAT('user-',n),
CONCAT(
CHAR(65 + (RAND() * 25) USING ascii), -- Number between 65 and 65+25, converted to a character, A-Z
'-user-',
n,
'@example.com'
)
FROM
(WITH RECURSIVE nr(n) AS
(SELECT 1 -- Start CTE at 1
UNION ALL SELECT n + 1 -- increase n with 1 every loop
FROM nr WHERE n < 1000000 -- stop loop at 1_000_000
) SELECT n FROM nr
) a;
```

The load comes from executing the above statement intensively in a short time.
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