- Enable the slow query log if it's not already enabled:SET GLOBAL slow
query
log = 'ON';
SET GLOBAL longquery
time = 2; -- Adjust based on need, captures queries taking longer than 2 seconds.
SET GLOBAL slowquery
log_file = '/path/to/your/logfile.log';
- Analyze the log file using tools like `mysqldumpslow` or `pt-query-digest` to find the most resource-intensive queries.
SELECT table
schema AS `Database`, table
name AS `Table`,
round(((datalength + index
length) / 1024 / 1024), 2) `Size in MB`
FROM information_schema.TABLES
ORDER BY (datalength + index
length) DESC;
- Use the `EXPLAIN` statement on slow queries to check if indexes are being used effectively.
- Investigate columns used in JOIN, WHERE, ORDER BY, and GROUP BY clauses for potential indexing.
- Query performance schema or information_schema to analyze memory allocation:SELECT * FROM sys.x$memory
global
by
current
bytes WHERE current
count > 0 ORDER BY current
allocated DESC;
- Adjust key buffer sizes if necessary, for example:SET GLOBAL key
buffer
size = 268435456; -- Adjust size according to analysis
- Check max connections:SHOW VARIABLES LIKE "max_connections";
- Adjust if necessary:SET GLOBAL max_connections = 200; -- Adjust based on your server’s capability and needs.
- Check current buffer pool size:SHOW VARIABLES LIKE 'innodb
buffer
pool_size';
- Adjust the buffer pool size (example):SET GLOBAL innodb
buffer
pool_size = 134217728; -- Adjust based on system RAM and MySQL documentation.
OPTIMIZE TABLE your
table
name;
10. Finally, if specific queries are identified as problematic, consider rewriting them for efficiency or implementing caching mechanisms to reduce database load.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)