Une entrée de trop

merci de ton attention pour mon cas.

Je m'explique, la db tourne pour un siteweb (gallerie d'image).
Le site tourne bien jusqu'a ce que j'ajoute encore une nouvelle entrer en l'occurance
en passant de 61200 entrées à 61201.

Coté utilisateur du site, il n'y a que des SELECT du type :

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SELECT T_poster.id, T_poster.file, T_poster.dater, FC_ratings.hits, FC_ratings.total_votes,
FC_name.name, FC_name.country, FC_name.id AS IDName
FROM  FC_poster AS T_poster
LEFT JOIN FC_name ON (T_poster.id_name = FC_name.id)
LEFT JOIN FC_ratings ON (T_poster.id = FC_ratings.id)
WHERE FC_name.born <= '$dateMoin18'
ORDER BY T_poster.dater DESC
LIMIT  $begin,$NB_IMAGE_AFFICHER

Avant l'ajout de cette ultime entrée voila une image representative de mon "top"

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top - 17:40:11 up 12 days, 23:27,  1 user,  load average: 1.82, 2.05, 2.51
Tasks: 713 total,   2 running, 711 sleeping,   0 stopped,   0 zombie
Cpu(s): 17.4%us,  9.6%sy,  0.0%ni, 46.5%id, 24.2%wa,  0.3%hi,  2.0%si,  0.0%st
Mem:   8091116k total,  8038320k used,    52796k free,   650700k buffers
Swap:  2096472k total,    30604k used,  2065868k free,  2766456k cached
 
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
18012 mysql     20   0 1440m 1.2g 5204 S   80 15.7   1030:18 mysqld
22333 www-data  20   0  224m 8760 3588 S    2  0.1   0:01.52 apache2
22539 www-data  20   0  229m  12m 3640 S    2  0.2   0:01.43 apache2
12962 www-data  20   0  226m  10m 3608 S    1  0.1   0:03.69 apache2
18335 www-data  20   0  226m  10m 3648 S    1  0.1   0:14.88 apache2
22030 www-data  20   0  224m 8672 3596 S    1  0.1   0:01.29 apache2
22045 www-data  20   0  223m 7924 3600 S    1  0.1   0:01.48 apache2
16676 www-data  20   0  226m  10m 3648 S    1  0.1   0:14.09 apache2
 5043 www-data  20   0  226m  10m 3648 S    1  0.1   0:07.33 apache2
10901 www-data  20   0  226m  10m 3640 S    1  0.1   0:04.86 apache2
13062 www-data  20   0  226m  11m 3956 S    1  0.1   0:15.76 apache2
13291 www-data  20   0  226m  10m 3648 S    1  0.1   0:03.61 apache2
16678 www-data  20   0  226m  10m 3776 D    1  0.1   0:15.79 apache2
19616 www-data  20   0  224m 8784 3600 S    1  0.1   0:01.80 apache2
22052 www-data  20   0  224m 8624 3620 S    1  0.1   0:01.31 apache2
24505 www-data  20   0  224m 7952 3588 S    1  0.1   0:00.63 apache2
24556 root      20   0 19384 1776  932 R    1  0.0   0:08.37 top
25790 www-data  20   0  226m  10m 3676 S    1  0.1   0:11.07 apache2
30176 root      20   0 16700  260  144 S    1  0.0  12:15.81 rotatelogs
 5082 www-data  20   0  226m  10m 3648 S    0  0.1   0:06.79 apache2
 5232 www-data  20   0  226m  10m 3660 S    0  0.1   0:06.74 apache2
 7884 www-data  20   0  226m  10m 3880 S    0  0.1   0:05.60 apache2
 7939 www-data  20   0  226m  11m 3972 S    0  0.1   0:07.65 apache2
10571 www-data  20   0  226m  10m 3724 S    0  0.1   0:04.49 apache2
10620 www-data  20   0  226m  10m 3872 S    0  0.1   0:04.28 apache2
10890 www-data  20   0  224m 8984 3636 S    0  0.1   0:04.78 apache2
12476 www-data  20   0  226m  10m 3680 S    0  0.1   0:04.45 apache2
12953 www-data  20   0  226m  10m 3632 S    0  0.1   0:03.39 apache2
12960 www-data  20   0  224m 8852 3640 S    0  0.1   0:03.61 apache2
13296 www-data  20   0  226m  10m 3860 S    0  0.1   0:16.18 apache2
13301 www-data  20   0  226m  10m 3892 S    0  0.1   0:15.43 apache2
13467 www-data  20   0  226m  10m 3772 S    0  0.1   0:16.87 apache2
14174 www-data  20   0  226m  10m 3880 S    0  0.1   0:15.08 apache2
14226 www-data  20   0  226m  10m 3872 S    0  0.1   0:15.53 apache2
14367 www-data  20   0  224m 8724 3664 S    0  0.1   0:03.44 apache2
14368 www-data  20   0  224m 8728 3648 S    0  0.1   0:03.49 apache2
14438 www-data  20   0  226m  10m 3880 S    0  0.1   0:16.09 apache2
...

EXPLAIN d'une requete de SELECT

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EXPLAIN SELECT T_poster.id, T_poster.file, T_poster.dater, FC_ratings.hits, FC_ratings.total_votes,
FC_name.name, FC_name.country, FC_name.id AS IDName
FROM  FC_poster AS T_poster
LEFT JOIN FC_name ON (T_poster.id_name = FC_name.id)
LEFT JOIN FC_ratings ON (T_poster.id = FC_ratings.id)
WHERE FC_name.born <= '01-01-1990'
ORDER BY T_poster.dater DESC
LIMIT  0,45

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id	select_type	table	type	possible_keys	key		key_len	ref		rows	Extra
1	SIMPLE	T_poster	index	id_name		dater	8	NULL			61200	 
1	SIMPLE	FC_name		eq_ref	PRIMARY,born	PRIMARY	2	cfake.T_poster.id_name	1	Using where
1	SIMPLE	FC_ratings	eq_ref	id		id	3	cfake.T_poster.id	1

Et voilà le meme top au moment ou j'effectue UPDATE pour la 61201eme entrée :

Tout monte en flèche, l'update et effectuer mais dans les secondes qui suivent,
sur le site j'ai : Warning: mysql_connect() [function.mysql-connect]: Can't connect to MySQL server on '127.0.0.1' (4) in /home/cfake/connexion.php on line 2

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top - 17:42:29 up 12 days, 23:29,  1 user,  load average: 80.49, 26.09, 10.83
Tasks: 944 total,   1 running, 943 sleeping,   0 stopped,   0 zombie
Cpu(s):  3.1%us,  7.8%sy,  0.0%ni, 67.9%id, 21.0%wa,  0.1%hi,  0.0%si,  0.0%st
Mem:   8091116k total,  8039968k used,    51148k free,     7972k buffers
Swap:  2096472k total,   886092k used,  1210380k free,    35444k cached
 
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
18012 mysql     20   0 6086m 4.8g 2168 D  220 62.4   1033:06 mysqld
  402 root      15  -5     0    0    0 S   22  0.0  13:27.73 kswapd0
24556 root      20   0 19640 1600  596 R    1  0.0   0:09.37 top
30174 root      20   0  222m 2524  492 S    0  0.0   0:26.28 apache2
    1 root      20   0  4004   88   40 S    0  0.0   0:00.99 init
    2 root      15  -5     0    0    0 S    0  0.0   0:00.00 kthreadd
    3 root      RT  -5     0    0    0 S    0  0.0   0:00.16 migration/0
    4 root      15  -5     0    0    0 S    0  0.0   0:00.95 ksoftirqd/0
    5 root      RT  -5     0    0    0 S    0  0.0   0:00.36 migration/1
    6 root      15  -5     0    0    0 S    0  0.0   0:14.10 ksoftirqd/1
    7 root      RT  -5     0    0    0 S    0  0.0   0:00.25 migration/2
    8 root      15  -5     0    0    0 S    0  0.0   0:10.77 ksoftirqd/2
    9 root      RT  -5     0    0    0 S    0  0.0   0:00.37 migration/3
   10 root      15  -5     0    0    0 S    0  0.0   0:08.35 ksoftirqd/3
   11 root      15  -5     0    0    0 S    0  0.0   0:00.10 events/0
   12 root      15  -5     0    0    0 S    0  0.0   0:03.19 events/1
...

EXPLAIN d'une requete de SELECT

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EXPLAIN SELECT T_poster.id, T_poster.file, T_poster.dater, FC_ratings.hits, FC_ratings.total_votes,
FC_name.name, FC_name.country, FC_name.id AS IDName
FROM  FC_poster AS T_poster
LEFT JOIN FC_name ON (T_poster.id_name = FC_name.id)
LEFT JOIN FC_ratings ON (T_poster.id = FC_ratings.id)
WHERE FC_name.born <= '01-01-1990'
ORDER BY T_poster.dater DESC
LIMIT  0,45

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id	select_type	table		type		possible_keys	key	key_len	ref		rows	Extra
1	SIMPLE		FC_name	ALL	PRIMARY,born	NULL		NULL	NULL			3074	Using where; Using temporary; Using filesort
1	SIMPLE		T_poster	ref	id_name	id_name		2	cfake.FC_name.id	20	 
1	SIMPLE		FC_ratings	eq_ref	id	id		3	cfake.T_poster.id	1

A ce moment je stop les serveurs mysql, apache2
Puis je start les serveurs, je supprime rapidement (avant une re saturation) l'entrée et tout revient à la normale.

Question espace disque, je pense pas avoir de probleme :

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df -h
Sys. de fich.            Tail. Occ. Disp. %Occ. Monté sur
/dev/sda1             9,7G  2,9G  6,3G  32% /
varrun                3,9G   72K  3,9G   1% /var/run
varlock               3,9G     0  3,9G   0% /var/lock
udev                  3,9G   20K  3,9G   1% /dev
devshm                3,9G     0  3,9G   0% /dev/shm
/dev/sda2             677G   43G  600G   7% /home

Pour information voilà "sh tuning-primer.sh" apres 21h de Uptime

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mysqld is alive
 
        -- MYSQL PERFORMANCE TUNING PRIMER --
             - By: Matthew Montgomery -
 
MySQL Version 5.0.51a-3ubuntu5.4-log x86_64
 
Uptime = 0 days 21 hrs 59 min 55 sec
Avg. qps = 334
Total Questions = 26455813
Threads Connected = 11
 
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 enabled.
Current long_query_time = 3 sec.
You have 70 out of 26455834 that take longer than 3 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 = 16
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
 
MAX CONNECTIONS
Current max_connections = 500
Current threads_connected = 18
Historic max_used_connections = 132
The number of used connections is 26% of the configured maximum.
Your max_connections variable seems to be fine.
 
MEMORY USAGE
Max Memory Ever Allocated : 1 G
Configured Max Per-thread Buffers : 1 G
Configured Max Global Buffers : 1 G
Configured Max Memory Limit : 2 G
Physical Memory : 7.71 G
Max memory limit seem to be within acceptable norms
 
KEY BUFFER
Current MyISAM index space = 12 M
Current key_buffer_size = 8 M
Key cache miss rate is 1 : 2257438
Key buffer fill ratio = 54.00 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere
 
QUERY CACHE
Query cache is enabled
Current query_cache_size = 1.00 G
Current query_cache_used = 891 M
Current query_cache_limit = 32 M
Current Query cache Memory fill ratio = 87.02 %
Current query_cache_min_res_unit = 4 K
However, 388445 queries have been removed from the query cache due to lack of memory
Perhaps you should raise query_cache_size
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 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
 
OPEN FILES LIMIT
Current open_files_limit = 2910 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 = 1200 tables
You have a total of 79 tables
You have 326 open tables.
The table_cache value seems to be fine
 
TEMP TABLES
Current max_heap_table_size = 512 M
Current tmp_table_size = 512 M
Of 304075 temp tables, 0% were created on disk
Created disk tmp tables ratio seems fine
 
TABLE SCANS
Current read_buffer_size = 128 K
Current table scan ratio = 255 : 1
read_buffer_size seems to be fine
 
TABLE LOCKING
Current Lock Wait ratio = 1 : 52
You may benefit from selective use of InnoDB.

Si, besoin de toutes autres informations c'est possible.