MySql Performance tuning ..



Es gibt ein Script tuning-primer was eine MySql Installation auf Performance überprüft und geeignete verbesserungsvorschläge macht. Man installiert das Script wie folgt:
[code]

wget http://www.day32.com/MySQL/tuning-primer.sh

chmod 755 tuning-primer.sh
# nun aufrufen mittels :
./tuning-primer.sh
[/code]
Die Ausgabe des Scripts sieht folgendermaßen aus :
[code]
— MYSQL PERFORMANCE TUNING PRIMER —
– By: Matthew Montgomery –

MySQL Version 5.0.32-Debian_7etch12-log x86_64

Uptime = 0 days 0 hrs 16 min 1 sec
Avg. qps = 7
Total Questions = 6773
Threads Connected = 8

Warning: Server has not been running for at least 48hrs.
It may not be safe to use 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 = 10 sec.
You have 0 out of 6794 that take longer than 10 sec. to complete
Your long_query_time seems to be fine

BINARY UPDATE LOG
The binary update log is enabled
Binlog sync is not enabled, you could loose binlog records during a server crash

WORKER THREADS
Current thread_cache_size = 8
Current threads_cached = 1
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 = 10
Historic max_used_connections = 11
The number of used connections is 22% of the configured maximum.
Your max_connections variable seems to be fine.

INNODB STATUS
Current InnoDB index space = 0 bytes
Current InnoDB data space = 0 bytes
Current InnoDB buffer pool free = 96 %
Current innodb_buffer_pool_size = 8 M
Depending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory

MEMORY USAGE
Max Memory Ever Allocated : 71 M
Configured Max Per-thread Buffers : 132 M
Configured Max Global Buffers : 42 M
Configured Max Memory Limit : 174 M
Physical Memory : 700 M
Max memory limit seem to be within acceptable norms

KEY BUFFER
Current MyISAM index space = 13 M
Current key_buffer_size = 16 M
Key cache miss rate is 1 : 89
Key buffer free ratio = 81 %
Your key_buffer_size seems to be fine

QUERY CACHE
Query cache is enabled
Current query_cache_size = 16 M
Current query_cache_used = 2 M
Current query_cache_limit = 1 M
Current Query cache Memory fill ratio = 12.93 %
Current query_cache_min_res_unit = 4 K
Your query_cache_size seems to be too high.
Perhaps you can use these resources elsewhere
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 = 256 K
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 132.00 K
You have had 9 queries where a join could not use an index properly
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 = 1024 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 = 64 tables
You have a total of 601 tables
You have 64 open tables.
Current table_cache hit rate is 1%
, while 100% of your table cache is in use
You should probably increase your table_cache

TEMP TABLES
Current max_heap_table_size = 16 M
Current tmp_table_size = 32 M
Of 1224 temp tables, 27% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
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 = 128 K
Current table scan ratio = 18 : 1
read_buffer_size seems to be fine

TABLE LOCKING
Current Lock Wait ratio = 0 : 7064
Your table locking seems to be fine

[/code]
Links:

http://www.thomas-krenn.com/de/wiki/MySQL_Performance_Tuning

Schreibe einen Kommentar

Deine E-Mail-Adresse wird nicht veröffentlicht. Erforderliche Felder sind mit * markiert.