Consultas de base de datos de perfil
Al escribir en una base de datos, puede resultar útil ejecutar la generación de perfiles para identificar el impacto de esos cambios. La generación de perfiles mantiene un registro de las consultas de base de datos y aumenta la precisión en tiempo de ejecución.
Para habilitar el perfil de consultas de base de datos:
-
Habilite la generación de perfiles.
code language-sql SET @@profiling = 1; ... run some queries -
Mostrar el registro de consultas.
code language-sql SHOW profiles -
Borre la cola del perfil.
code language-sql SET @@profiling = 0; SET @@profiling_history_size = 0; SET @@profiling_history_size = 100; SET @@profiling = 1;
Ejemplo de registro
MariaDB [6fck2obu3244c]> show profiles;
+----------+------------+---------------------------------------------------------------------------------------------------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+---------------------------------------------------------------------------------------------------------------------------------+
| 2 | 0.00375905 | ALTER TABLE mcom_logged_messages_queue DROP INDEX status |
| 3 | 1.13660446 | CREATE INDEX `idx_status_direction` ON mcom_logged_messages_queue (status, direction) |
| 4 | 0.00270735 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 5 | 0.00376312 | ALTER TABLE mcom_logged_messages_queue DROP INDEX status |
| 6 | 0.00585975 | ALTER TABLE mcom_logged_messages_queue DROP INDEX idx_status_direction |
| 7 | 1.16887269 | CREATE INDEX `idx_status` ON mcom_logged_messages_queue (status) |
| 8 | 0.00299303 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 9 | 0.00379892 | ALTER TABLE mcom_logged_messages_queue DROP INDEX status |
| 10 | 0.00737345 | ALTER TABLE mcom_logged_messages_queue DROP INDEX idx_status |
| 11 | 1.05551113 | CREATE INDEX `idx_direction` ON mcom_logged_messages_queue (direction) |
| 12 | 1.02493811 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 13 | 0.00368751 | ALTER TABLE mcom_logged_messages_queue DROP INDEX status |
| 14 | 0.00706102 | ALTER TABLE mcom_logged_messages_queue DROP INDEX idx_direction |
| 15 | 0.29753293 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 16 | 1.24034449 | CREATE INDEX `idx_direction` ON mcom_logged_messages_queue (direction) |
| 17 | 0.74422050 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 18 | 1.16976630 | CREATE INDEX `idx_status` ON mcom_logged_messages_queue (status) |
| 19 | 0.00293179 | SELECT count(*) FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 20 | 0.02663829 | SELECT * FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
| 21 | 0.00736756 | ALTER TABLE mcom_logged_messages_queue DROP INDEX idx_direction |
| 22 | 0.00406736 | ALTER TABLE mcom_logged_messages_queue DROP INDEX status |
| 23 | 0.00815528 | ALTER TABLE mcom_logged_messages_queue DROP INDEX idx_status |
| 24 | 0.37585821 | SELECT * FROM `mcom_logged_messages_queue` WHERE (status = 'FAILED') AND (direction = 'outgoing') ORDER BY `sent_at` ASC |
+----------+------------+---------------------------------------------------------------------------------------------------------------------------------+
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