Yes, this is two innoDB tables on both versions. The problem occurs when i am working with the transaction table. I had reported the "select count(recipient) from transactions;" request as an example. Again, thanks for your help. It is much appreciated. Here's the outputs of the requests you have required : Mariadb 10.3 : MariaDB [cfms_accounting]> select SQL_NO_CACHE count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (4,470 sec) MariaDB [cfms_accounting]> select SQL_NO_CACHE count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (4,354 sec) MariaDB 10.11 : MariaDB [cfms_accounting]> select SQL_NO_CACHE count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (0,724 sec) MariaDB [cfms_accounting]> select SQL_NO_CACHE count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (0,671 sec) SHOW CREATE TABLE transactions; CREATE TABLE `transactions` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `reference` varchar(255) NOT NULL, `recipient` varchar(255) DEFAULT NULL, `sender` varchar(255) DEFAULT NULL, `sender_reference` varchar(255) DEFAULT NULL, `amount` double(15,8) NOT NULL, `amount_type` varchar(255) NOT NULL, `old_balance` double(15,8) NOT NULL, `new_balance` double(15,8) NOT NULL, `remark` text DEFAULT NULL, `order` varchar(255) DEFAULT NULL, `form_state` text DEFAULT NULL, `creator_user_id` int(10) unsigned NOT NULL, `accounting_group_id` int(10) unsigned NOT NULL, `working_group_id` int(10) unsigned DEFAULT NULL, `resource_id` int(10) unsigned DEFAULT NULL, `transaction_type_id` int(10) unsigned NOT NULL, `start_time` timestamp NOT NULL, `end_time` timestamp NOT NULL, `created_at` timestamp NOT NULL, `updated_at` timestamp NOT NULL, `deleted_at` timestamp NULL DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `transactions_reference_unique` (`reference`), KEY `transactions_creator_user_id_foreign` (`creator_user_id`), KEY `transactions_accounting_group_id_foreign` (`accounting_group_id`), KEY `transactions_working_group_id_foreign` (`working_group_id`), KEY `transactions_transaction_type_id_foreign` (`transaction_type_id`), KEY `transactions_resource_id_foreign` (`resource_id`), KEY `end_time` (`end_time`), KEY `deleted_at` (`deleted_at`) ) ENGINE=InnoDB AUTO_INCREMENT=2848536 DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_unicode_ci Le 24/03/2025 à 17:24, Gordan Bobic a écrit :
So the problem query is: ``` select count(recipient) from transactions; ``` ?
Can you share the output of: ``` SHOW CREATE TABLE transactions; ``` ?
It could be the difference between cold caches and hot caches. Are the tables InnoDB on both versions? Is innodb_buffer_pool_size the same?
Can you run this twice, and report back the second timing? ``` select SQL_NO_CACHE count(recipient) from transactions; ```
On Mon, 24 Mar 2025 at 18:15, Olivier Miquel <olivier.miquel@mri.cnrs.fr> wrote:
Hello,
Thanks for your answer.
In this case the slowdown is occuring with simple select queries on a table. No join.
How could this be possible between two versions?
O.
Le 24/03/2025 à 16:34, Gordan Bobic a écrit :
If you are seeing a difference of 3.5 orders of magnitude, that is almost certainly not something you can tune out with configuration options. You'll need to look at the queries and work out which ones are now running with a sub-optimal execution profile. Once you identify them, you'll have to apply index or join order hints to get them back onto a sensible execution plan.
On Mon, 24 Mar 2025 at 17:16, Olivier Miquel via discuss <discuss@lists.mariadb.org> wrote:
Hello,
I am experiencing major performance problems when upgrading our version of mariadb from debian 10 ( mariadb 10.3 ) to debian 12 ( mariadb 10.5 ). It's especially when accessing a table with about 2 million records that requests are much slower ( 4.7 seconds vs 0.001 s ) to the point of making our application unusable. I've observed this between two versions of mariadb, each with default settings in Debian.
I've tried changing the settings several times, but nothing seems to help.
Do you have any idea why this big difference in performance and how to fix it?
Thanks for your help,
______________
_______
MariaDB [cfms_accounting]> DESCRIBE transactions; +---------------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------------+------------------+------+-----+---------+----------------+ | id | int(10) unsigned | NO | PRI | NULL | auto_increment | | reference | varchar(255) | NO | UNI | NULL | | | recipient | varchar(255) | YES | | NULL | | | sender | varchar(255) | YES | | NULL | | | sender_reference | varchar(255) | YES | | NULL | | | amount | double(15,8) | NO | | NULL | | | amount_type | varchar(255) | NO | | NULL | | | old_balance | double(15,8) | NO | | NULL | | | new_balance | double(15,8) | NO | | NULL | | | remark | text | YES | | NULL | | | order | varchar(255) | YES | | NULL | | | form_state | text | YES | | NULL | | | creator_user_id | int(10) unsigned | NO | MUL | NULL | | | accounting_group_id | int(10) unsigned | NO | MUL | NULL | | | working_group_id | int(10) unsigned | YES | MUL | NULL | | | resource_id | int(10) unsigned | YES | MUL | NULL | | | transaction_type_id | int(10) unsigned | NO | MUL | NULL | | | start_time | timestamp | NO | | NULL | | | end_time | timestamp | NO | MUL | NULL | | | created_at | timestamp | NO | | NULL | | | updated_at | timestamp | NO | | NULL | | | deleted_at | timestamp | YES | MUL | NULL | | +---------------------+------------------+------+-----+---------+----------------+
MariaDB [cfms_accounting]> ANALYZE TABLE transactions; +------------------------------+---------+----------+----------+ | Table | Op | Msg_type | Msg_text | +------------------------------+---------+----------+----------+ | cfms_accounting.transactions | analyze | status | OK | +------------------------------+---------+----------+----------+ 1 row in set (0,107 sec)
Server version: 10.3.39-MariaDB-0+deb10u2 Debian 10
MariaDB [cfms_accounting]> SELECT count(*) from transactions; +----------+ | count(*) | +----------+ | 1912563 | +----------+ 1 row in set (0,616 sec)
MariaDB [cfms_accounting]> EXPLAIN select count(recipient) from transactions; +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ | 1 | SIMPLE | transactions | ALL | NULL | NULL | NULL | NULL | 1942730 | | +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ 1 row in set (0,002 sec)
MariaDB [cfms_accounting]> select count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (0,001 sec)
Server version: 10.11.11-MariaDB-0+deb12u1 Debian 12
MariaDB [cfms_accounting]> ANALYZE TABLE transactions; +------------------------------+---------+----------+----------+ | Table | Op | Msg_type | Msg_text | +------------------------------+---------+----------+----------+ | cfms_accounting.transactions | analyze | status | OK | +------------------------------+---------+----------+----------+ 1 row in set (0,058 sec)
MariaDB [cfms_accounting]> select count(*) from transactions; +----------+ | count(*) | +----------+ | 1912563 | +----------+ 1 row in set (0,333 sec)
MariaDB [cfms_accounting]> EXPLAIN select count(recipient) from transactions; +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ | 1 | SIMPLE | transactions | ALL | NULL | NULL | NULL | NULL | 1779448 | | +------+-------------+--------------+------+---------------+------+---------+------+---------+-------+ 1 row in set (0,002 sec)
MariaDB [cfms_accounting]> select count(recipient) from transactions; +------------------+ | count(recipient) | +------------------+ | 419 | +------------------+ 1 row in set (4,778 sec)
-- Olivier Miquel Administrateur Système et Réseau Plate-forme technologique MRI Tel : 06.50.19.27.43 Mail:olivier.miquel@mri.cnrs.fr
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-- Olivier Miquel Administrateur Système et Réseau Plate-forme technologique MRI Tel : 06.50.19.27.43 Mail:olivier.miquel@mri.cnrs.fr
-- Olivier Miquel Administrateur Système et Réseau Plate-forme technologique MRI Tel : 06.50.19.27.43 Mail:olivier.miquel@mri.cnrs.fr