my.cnf 推薦配置

disable transparent hugepages

#!/bin/sh
### BEGIN INIT INFO
# Provides:          disable-transparent-hugepages
# Required-Start:    $local_fs
# Required-Stop:
# X-Start-Before:    mongod mongodb-mms-automation-agent
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Disable Linux transparent huge pages
# Description:       Disable Linux transparent huge pages, to improve
#                    database performance.
### END INIT INFO

case $1 in
  start)
    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/transparent_hugepage
    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
    else
      return 0
    fi

    echo 'never' > ${thp_path}/enabled
    echo 'never' > ${thp_path}/defrag

    unset thp_path
    ;;
esac      

資料庫使用 tcmalloc 記憶體優化算法

yum install libunwind gperftools gperftools-devel

wget http://mirror.yongbok.net/nongnu/libunwind/libunwind-1.5-rc2.tar.gz

wget https://github.com/google/tcmalloc/archive/master.zip

malloc-lib=/usr/lib64/libtcmalloc.so      

undo log 需要在初始化時便依照配置檔案初始化

# 準備需要的目錄
groupadd mysql
useradd -r -g mysql -s /bin/false mysql
mkdir -p /data/mysql-{data,binlogs}
mkdir -p /usr/local/mysql/log
chown -R mysql.mysql /data/mysql-data
chown -R mysql.mysql /data/mysql-binlogs
chown -R mysql.mysql /usr/local/mysql

# MySQL 5.6
/usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/data/mysql-data/ --basedir=/usr/local/mysql/ --defaults-file=/usr/local/mysql/my.cnf --keep-my-cnf

# MySQL 5.7
/usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/my.cnf --initialize --user=mysql --datadir=/data/mysql-data/ --basedir=/usr/local/mysql/      

my.cnf 配置示例

# MySQL Optimal Configuration File

#This configration file opts for MySQL 5.6 and 5.7.
#If you have any problem, dont hesitate to concact me.
#Let us make an optimal MySQL configuration file template for product enviroment.

#I assume the MySQL Server as followings. You should tune the variables according to your server. 

#* 32 CPU core
#* 256G Memory
#* SSD storage with 20000 IOPS in 16K page size 

#  my.cnf
# author: [email protected]

[client]
user = root
password = 1111aaA_

[mysql]
prompt = [\\u@\\p][\\d]>\\_
no-auto-rehash

[mysqld_safe]
malloc-lib=/usr/lib64/libtcmalloc.so # yum install gperftools gperftools-devel

[mysqldump]
single-transaction

[mysqld]
# basic settings #
user = mysql
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
autocommit = 1
server-id = 8888
character_set_server=utf8mb4
datadir=/data/mysql-data
transaction_isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
max_allowed_packet = 64M
event_scheduler = 1

# connection #
interactive_timeout = 1800
wait_timeout = 1800
lock_wait_timeout = 1800
skip_name_resolve = 1
max_connections = 1024
max_user_connections = 256
max_connect_errors = 1000000

# table cache performance settings
table_open_cache = 4096
table_definition_cache = 4096
table_open_cache_instances = 64

# session memory settings #
read_buffer_size = 16M
read_rnd_buffer_size = 32M
sort_buffer_size = 32M
tmp_table_size = 64M
join_buffer_size = 128M
thread_cache_size = 64

# log settings #
log_error = /usr/local/mysql/log/error.log
log_bin = /data/mysql-binlogs/binlog
log_error_verbosity = 2
general_log_file = /usr/local/mysql/log/general.log
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/log/slow.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 90
long_query_time = 2
min_examined_row_limit = 100
log-bin-trust-function-creators = 1
log-slave-updates = 1

# innodb settings #
innodb_page_size = 16384
innodb_buffer_pool_size = 160G
innodb_buffer_pool_instances = 16
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 4096
innodb_lock_wait_timeout = 5
innodb_io_capacity = 10000
innodb_io_capacity_max = 20000
innodb_flush_method = O_DIRECT
innodb_undo_logs = 128
innodb_undo_tablespaces = 3
innodb_flush_neighbors = 0
innodb_log_file_size = 16G
innodb_log_files_in_group = 2
innodb_log_buffer_size = 64M
innodb_purge_threads = 4
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 128M
innodb_write_io_threads = 16
innodb_read_io_threads = 16 
innodb_file_per_table = 1
innodb_stats_persistent_sample_pages = 64
innodb_autoinc_lock_mode = 2
innodb_online_alter_log_max_size=1G
innodb_open_files=4096

# replication settings #
master_info_repository = TABLE
relay_log_info_repository = TABLE
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = ROW
binlog_rows_query_log_events = 1
relay_log = relay.log
relay_log_recovery = 1
slave_skip_errors = ddl_exist_errors
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'

# semi sync replication settings #
plugin-load = "group_replication.so;validate_password.so;semisync_master.so;semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_master_timeout = 3000
loose_rpl_semi_sync_slave_enabled = 1

# password plugin #
validate_password_policy = STRONG
validate-password = FORCE_PLUS_PERMANENT

# perforamnce_schema settings
performance-schema-instrument='memory/%=COUNTED'
performance_schema_digests_size = 40000
performance_schema_max_table_instances = 40000
performance_schema_max_sql_text_length = 4096
performance_schema_max_digest_length = 4096

[mysqld-5.6]
# metalock performance settings
metadata_locks_hash_instances = 64

[mysqld-5.7]
# new innodb settings #
loose_innodb_numa_interleave = 1
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 16
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128

# new replication settings #
slave-parallel-type = LOGICAL_CLOCK
slave-parallel-workers = 16
slave_preserve_commit_order = 1
slave_transaction_retries = 128
# other change settings #
binlog_gtid_simple_recovery = 1
log_timestamps = system
show_compatibility_56 = on

# group replication settings
plugin-load = "group_replication.so;validate_password.so;semisync_master.so;semisync_slave.so"
transaction-write-set-extraction = XXHASH64
# report_host = 127.0.0.1 # optional for group replication
# binlog_checksum = NONE # only for group replication
loose_group_replication = FORCE_PLUS_PERMANENT
loose_group_replication_group_name = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
loose_group_replication_compression_threshold = 100
loose_group_replication_flow_control_mode = 0
loose_group_replication_single_primary_mode = 0
loose_group_replication_enforce_update_everywhere_checks = 1
loose_group_replication_transaction_size_limit = 10485760
loose_group_replication_unreachable_majority_timeout = 120
loose_group_replication_start_on_boot = 0      

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