Je viens d'installer MySQL 5.5 qui a le moteur InnoDB par défaut et j'ai réalisé que les requêtes INSERT sont vraiment lentes ! Après avoir désactivé general-log, ça s'est un peu amélioré mais c'est toujours aussi lent. J'ai analysé mysql pour trouver le problème mais aucune chance.
Voici un point de comparaison :
Test d'un tableau MYISAM (n) utilisant 500 lignes. - 5866 insertions par seconde. - 128866 lectures de lignes par seconde. - 56306 mises à jour par seconde.
Test d'une table INNODB (n) utilisant 500 lignes. - 9 insertions par seconde. - 28539 lectures de lignes par seconde. - 4358 mises à jour par seconde.
J'ai 9 requêtes d'insertion sur InnoDB contre 5866 avec MyISAM.
Voici mon my.ini (Windows 8 64bit) :
[mysql]
default-character-set=utf8
no-auto-rehash
[mysqld]
max_allowed_packet = 500M
table_open_cache = 512
# The TCP/IP Port the MySQL Server will listen on
port=3306
# Path to installation directory. All paths are usually resolved relative to this.
basedir="C:\Program Files\MySQL\MySQL Server 5.5\"
# Path to the database root
datadir="D:\MySQL Datafiles\data\"
# The default character set that will be used when a new schema or table is
# created and no character set is defined
character-set-server=utf8
# The default storage engine that will be used when create new tables when
# default-storage-engine=MYISAM
# Set the SQL mode to strict
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
# Enable Windows Authentication
# plugin-load=authentication_windows.dll
# General and Slow logging.
#log-output=FILE
#general-log=0
#general_log_file="POOYA.log"
#slow-query-log=0
#slow_query_log_file="POOYA-slow.log"
#long_query_time=10
#innodb_flush_log_at_trx_commit = 2
# Binary Logging.
# log-bin
# Error Logging.
log-error="POOYA.err"
max_connections=100
query_cache_size=32M
table_cache=512
tmp_table_size=64M
thread_cache_size=8
myisam_max_sort_file_size=100G
myisam_sort_buffer_size=64M
key_buffer_size=256M
# Size of the buffer used for doing full table scans of MyISAM tables.
# Allocated per thread, if a full scan is needed.
read_buffer_size=1M
read_rnd_buffer_size=4M
# This buffer is allocated when MySQL needs to rebuild the index in
# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE
# into an empty table. It is allocated per thread so be careful with
# large settings.
sort_buffer_size=1M
#*** INNODB Specific options ***
# innodb_data_home_dir=0.0
# Use this option if you have a MySQL server with InnoDB support enabled
# but you do not plan to use it. This will save memory and disk space
# and speed up some things.
# skip-innodb
# Additional memory pool that is used by InnoDB to store metadata
# information. If InnoDB requires more memory for this purpose it will
# start to allocate it from the OS. As this is fast enough on most
# recent operating systems, you normally do not need to change this
# value. SHOW INNODB STATUS will display the current amount used.
innodb_additional_mem_pool_size=64M
# If set to 1, InnoDB will flush (fsync) the transaction logs to the
# disk at each commit, which offers full ACID behavior. If you are
# willing to compromise this safety, and you are running small
# transactions, you may set this to 0 or 2 to reduce disk I/O to the
# logs. Value 0 means that the log is only written to the log file and
# the log file flushed to disk approximately once per second. Value 2
# means the log is written to the log file at each commit, but the log
# file is only flushed to disk approximately once per second.
innodb_flush_log_at_trx_commit=1
# The size of the buffer InnoDB uses for buffering log data. As soon as
# it is full, InnoDB will have to flush it to disk. As it is flushed
# once per second anyway, it does not make sense to have it very large
# (even with long transactions).
innodb_log_buffer_size=8M
# InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and
# row data. The bigger you set this the less disk I/O is needed to
# access data in tables. On a dedicated database server you may set this
# parameter up to 80% of the machine physical memory size. Do not set it
# too large, though, because competition of the physical memory may
# cause paging in the operating system. Note that on 32bit systems you
# might be limited to 2-3.5G of user level memory per process, so do not
# set it too high.
innodb_buffer_pool_size=512M
# Size of each log file in a log group. You should set the combined size
# of log files to about 25%-100% of your buffer pool size to avoid
# unneeded buffer pool flush activity on log file overwrite. However,
# note that a larger logfile size will increase the time needed for the
# recovery process.
innodb_log_file_size=49M
# Number of threads allowed inside the InnoDB kernel. The optimal value
# depends highly on the application, hardware as well as the OS
# scheduler properties. A too high value may lead to thread thrashing.
innodb_thread_concurrency=17
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeoutJ'ai modifié ce fichier pour obtenir de hautes performances, et je n'ai jamais eu de problème avec mysql 5.1.
