Optimierungstipps MYSQL 512 MB
Guten Abend,
alter rödeliger Server mit ca. 2000 Besuchern pro Tag, 512 RAM, 2.4 GHZ Intel, Apache2, Mysql, postfix und hauptsächlich Foren-Software (SMF und Joomla) könnte vielleicht im Bereich MYSQL noch ein bisschen optimiert werden.
Vielleicht mag mir jemand helfen. Wäre toll. Wenn nötig stelle ich auch die gekürzte my.cnf zur Verfügung.
tuning-primer gibt mir folgende Werte:
-- MYSQL PERFORMANCE TUNING PRIMER --
- By: Matthew Montgomery -
MySQL Version 5.0.51-Dotdeb_0.dotdeb.1 i486
Uptime = 2 days 7 hrs 26 min 24 sec
Avg. qps = 14
Total Questions = 2819369
Threads Connected = 1
Server has been running for over 48hrs.
It should be safe to follow these recommendations
To find out more information on how each of these
runtime variables effects performance visit:
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html
Visit http://www.mysql.com/products/enterprise/advisors.html
for info about MySQL's Enterprise Monitoring and Advisory Service
SLOW QUERIES
The slow query log is NOT enabled.
Current long_query_time = 2 sec.
You have 34 out of 2819395 that take longer than 2 sec. to complete
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.0/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 32
Current threads_cached = 7
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 50
Current threads_connected = 1
Historic max_used_connections = 8
The number of used connections is 16% of the configured maximum.
Your max_connections variable seems to be fine.
MEMORY USAGE
Max Memory Ever Allocated : 78 M
Configured Max Per-thread Buffers : 310 M
Configured Max Global Buffers : 29 M
Configured Max Memory Limit : 339 M
Physical Memory : 504.75 M
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 52 M
Current key_buffer_size = 15 M
Key cache miss rate is 1 : 24
Key buffer fill ratio = 100.00 %
You could increase key_buffer_size
It is safe to raise this up to 1/4 of total system memory;
assuming this is a dedicated database server.
QUERY CACHE
Query cache is enabled
Current query_cache_size = 4 M
Current query_cache_used = 2 M
Current query_cache_limit = 1 M
Current Query cache Memory fill ratio = 62.66 %
Current query_cache_min_res_unit = 4 K
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 2 M
Current read_rnd_buffer_size = 28 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 2.00 M
You have had 27611 queries where a join could not use an index properly
You have had 180 joins without keys that check for key usage after each row
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
If you are unable to optimize your queries you may want to increase your
join_buffer_size to accommodate larger joins in one pass.
Note! This script will still suggest raising the join_buffer_size when
ANY joins not using indexes are found.
OPEN FILES LIMIT
Current open_files_limit = 4156 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_cache value = 2048 tables
You have a total of 1020 tables
You have 1061 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 10 M
Current tmp_table_size = 10 M
Of 55974 temp tables, 26% were created on disk
Perhaps you should increase your tmp_table_size and/or max_heap_table_size
to reduce the number of disk-based temporary tables
Note! BLOB and TEXT columns are not allow in memory tables.
If you are using these columns raising these values might not impact your
ratio of on disk temp tables.
TABLE SCANS
Current read_buffer_size = 1 M
Current table scan ratio = 408 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 31329
Your table locking seems to be fine
Danke,
Igor
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