Bonjour à tous,
Je passe une appli (SVP pour nos clients) qui tourne sur Java avec une BDD DB2 (sur un AS400 bete de course) vers un BDD MariaDB qui tourne sur un serveur Unix.
J'ai un problème de perfs.
Le nouveau serveur Unix a deux processeurs * 1 coeur et 5Go de RAM. Je pourrais négocier 2 coeurs de plus mais guère au-delà.
L'appli peut être sollicité par 100 utilisateurs/jour, et 10-15 utilisateurs actifs en meme temps.
Ma table principale compte 20000 enreg (nombre de tickets SVP) mais les tables dépendantes peuvent pour certaines atteindre 150 000 enreg.
J'utilise le moteur de recherche InnoDB, j'y suis obligé pour garder les contraintes de clés étrangères.
J'ai créé les index les plus logiques.
Chaque table possède en moyenne 50 champs. (numériques et varchar 10 ou 20)
Le problème c'est que j'ai des requête avec des 5 vues qui font appel a 4 tables chacune (voir d'autres vue), ce qui est très gourmands avec plusieurs dizaines de milliers d'enreg par tables. Je ne peux guère modifier ces requêtes, à moins de réécrire totalement l'appli. (je rappelle qu'il s'agit juste d'un changement de BDD).
Quelqu'un pourrait -il me dire si mon paramétrage my.cnf est déconnant ou pas. J'ai tuné en cherché des infos sur le web mais je suis pas expert.
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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# MariaDB database server configuration file.
#
# You can copy this file to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#  
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
 
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port		= 3306
socket		= /var/run/mysqld/mysqld.sock
 
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
 
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket		= /var/run/mysqld/mysqld.sock
nice		= 0
 
[mysqld]
#
# * Basic Settings
#
user		= mysql
pid-file	= /var/run/mysqld/mysqld.pid
socket		= /var/run/mysqld/mysqld.sock
port		= 3306
basedir		= /usr
datadir		= /var/lib/mysql
tmpdir		= /tmp
lc_messages_dir	= /usr/share/mysql
lc_messages	= en_US
skip-external-locking
lower_case_table_names = 1
character-set-server=utf8
collation-server=utf8_general_ci
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address		= 10.10.64.51
#
# * Fine Tuning
#
max_connections		= 100
connect_timeout		= 5
wait_timeout		= 600
max_allowed_packet	= 16M
thread_cache_size       = 128
#sort_buffer_size	= 4M
sort_buffer_size        = 8M
bulk_insert_buffer_size	= 16M
#tmp_table_size		= 32M
#max_heap_table_size	= 32M
#tmp_table_size          = 256M
tmp_table_size          = 512M
#max_heap_table_size     = 256M
max_heap_table_size     = 512M
#
# * MyISAM
#
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched. On error, make copy and try a repair.
myisam_recover_options = BACKUP
key_buffer_size		= 128M
#open-files-limit	= 2000
#table_open_cache	= 400
table_open_cache        = 600
myisam_sort_buffer_size	= 512M
concurrent_insert	= 2
read_buffer_size	= 2M
#read_rnd_buffer_size	= 1M
read_rnd_buffer_size    = 2M
#
# * Query Cache Configuration
#
# Cache only tiny result sets, so we can fit more in the query cache.
#query_cache_limit		= 128K
query_cache_limit               = 512K
#query_cache_size		= 256M
query_cache_size                = 512M
#query_cache_type		= DEMAND
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1
#
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
#
# we do want to know about network errors and such
log_warnings		= 2
#
# Enable the slow query log to see queries with especially long duration
#slow_query_log[={0|1}]
slow_query_log_file	= /var/log/mysql/mariadb-slow.log
long_query_time = 10
#log_slow_rate_limit	= 1000
log_slow_verbosity	= query_plan
 
#log-queries-not-using-indexes
#log_slow_admin_statements
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id		= 1
#report_host		= master1
#auto_increment_increment = 2
#auto_increment_offset	= 1
log_bin			= /var/log/mysql/mariadb-bin
log_bin_index		= /var/log/mysql/mariadb-bin.index
# not fab for performance, but safer
#sync_binlog		= 1
expire_logs_days	= 10
max_binlog_size         = 100M
# slaves
#relay_log		= /var/log/mysql/relay-bin
#relay_log_index	= /var/log/mysql/relay-bin.index
#relay_log_info_file	= /var/log/mysql/relay-bin.info
#log_slave_updates
#read_only
#
# If applications support it, this stricter sql_mode prevents some
# mistakes like inserting invalid dates etc.
#sql_mode		= NO_ENGINE_SUBSTITUTION,TRADITIONAL
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
default_storage_engine	= InnoDB
# you can't just change log file size, requires special procedure
#innodb_log_file_size	= 50M
#innodb_buffer_pool_size	= 256M
#innodb_buffer_pool_size = 512M
innodb_buffer_pool_size = 1G
innodb_log_buffer_size	= 8M
innodb_file_per_table	= 1
innodb_open_files	= 400
innodb_io_capacity	= 400
innodb_flush_method	= O_DIRECT
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
 
#
# * Galera-related settings
#
[galera]
# Mandatory settings
#wsrep_on=ON
#wsrep_provider=
#wsrep_cluster_address=
#binlog_format=row
#default_storage_engine=InnoDB
#innodb_autoinc_lock_mode=2
#
# Allow server to accept connections on all interfaces.
#
#bind-address=0.0.0.0
#
# Optional setting
#wsrep_slave_threads=1
#innodb_flush_log_at_trx_commit=0
 
[mysqldump]
quick
quote-names
max_allowed_packet	= 16M
 
[mysql]
#no-auto-rehash	# faster start of mysql but no tab completion
 
[isamchk]
key_buffer		= 16M
 
#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
Merci de votre aide. Bien entendu je suis preneur d'autres astuces.