性能問題MYISAM

Question

人

我需要生成從表中（約60萬條記錄和MyISAM存儲引擎）的報告。表A每隔15分鐘以cdr文件進行轉儲。

我想基於（日期）和（日期從）

夫婦，我試圖方案是如下面

1）我試圖創建一個臨時表B（生成報告使用create table B Engine = Myisam從表A中選擇a，c，d）

在進程列表中，如果表A正在被cdr記錄轉儲，則表A被鎖定。並將保持鎖定狀態。

如果表A中沒有插入cdr記錄，則在大約1分鐘內創建臨時表B.

有任何方法我可以創建當文件表A被傾倒臨時表乙

2）我試圖創建一個臨時表B（使用創建表B，從表A中選擇ACD）

在這種情況下，創建InnoDB引擎，並會採取很多空間

3）表b剛需的信息，如果我創建臨時b =引擎內存，這會對任何性能問題或沒有。

餘米附加的my.cnf如下

# Example MySQL config file for very large systems. 
# 
# This is for a large system with memory of 1G-2G where the system runs mainly 
# MySQL. 
# 
# MySQL programs look for option files in a set of 
# locations which depend on the deployment platform. 
# You can copy this option file to one of those 
# locations. For information about these locations, see: 
# http://dev.mysql.com/doc/mysql/en/option-files.html 
# 
# In this file, you can use all long options that a program supports. 
# If you want to know which options a program supports, run the program 
# with the "--help" option. 

# The following options will be passed to all MySQL clients 
[client] 
#password = your_password 
port  = 3306 
socket  = /var/lib/mysql/mysql.sock 

# Here follows entries for some specific programs 

# The MySQL server 
[mysqld] 
port  = 3306 
socket  = /var/lib/mysql/mysql.sock 
skip-locking 
key_buffer_size = 3G 
max_allowed_packet = 16M 
table_open_cache = 1024 
sort_buffer_size = 256M 
read_buffer_size = 1024M 
read_rnd_buffer_size = 64M 
myisam_sort_buffer_size = 4G 
thread_cache_size = 8 
query_cache_size = 256M 
query_cache_limit = 256M 

max_connections = 100 
max_heap_table_size = 64M 
join_buffer_size = 8M 
tmp_table_size = 1024M 
myisam_max_sort_file_size = 3G 
slow_query_log 



# Try number of CPU's*2 for thread_concurrency 
thread_concurrency = 8 

# Don't listen on a TCP/IP port at all. This can be a security enhancement, 
# if all processes that need to connect to mysqld run on the same host. 
# All interaction with mysqld must be made via Unix sockets or named pipes. 
# Note that using this option without enabling named pipes on Windows 
# (via the "enable-named-pipe" option) will render mysqld useless! 
# 
#skip-networking 

# Replication Master Server (default) 
# binary logging is required for replication 
log-bin=mysql-bin 

# required unique id between 1 and 2^32 - 1 
# defaults to 1 if master-host is not set 
# but will not function as a master if omitted 
server-id = 1 

# Replication Slave (comment out master section to use this) 
# 
# To configure this host as a replication slave, you can choose between 
# two methods : 
# 
# 1) Use the CHANGE MASTER TO command (fully described in our manual) - 
# the syntax is: 
# 
# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, 
# MASTER_USER=<user>, MASTER_PASSWORD=<password> ; 
# 
# where you replace <host>, <user>, <password> by quoted strings and 
# <port> by the master's port number (3306 by default). 
# 
# Example: 
# 
# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, 
# MASTER_USER='joe', MASTER_PASSWORD='secret'; 
# 
# OR 
# 
# 2) Set the variables below. However, in case you choose this method, then 
# start replication for the first time (even unsuccessfully, for example 
# if you mistyped the password in master-password and the slave fails to 
# connect), the slave will create a master.info file, and any later 
# change in this file to the variables' values below will be ignored and 
# overridden by the content of the master.info file, unless you shutdown 
# the slave server, delete master.info and restart the slaver server. 
# For that reason, you may want to leave the lines below untouched 
# (commented) and instead use CHANGE MASTER TO (see above) 
# 
# required unique id between 2 and 2^32 - 1 
# (and different from the master) 
# defaults to 2 if master-host is set 
# but will not function as a slave if omitted 
#server-id  = 2 
# 
# The replication master for this slave - required 
#master-host  = <hostname> 
# 
# The username the slave will use for authentication when connecting 
# to the master - required 
#master-user  = <username> 
# 
# The password the slave will authenticate with when connecting to 
# the master - required 
#master-password = <password> 
# 
# The port the master is listening on. 
# optional - defaults to 3306 
#master-port  = <port> 
# 
# binary logging - not required for slaves, but recommended 
#log-bin=mysql-bin 
# 
# binary logging format - mixed recommended 
#binlog_format=mixed 

# Uncomment the following if you are using InnoDB tables 
#innodb_data_home_dir = /var/lib/mysql 
#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend 
#innodb_log_group_home_dir = /var/lib/mysql 
# You can set .._buffer_pool_size up to 50 - 80 % 
# of RAM but beware of setting memory usage too high 
#innodb_buffer_pool_size = 384M 
#innodb_additional_mem_pool_size = 20M 
# Set .._log_file_size to 25 % of buffer pool size 
#innodb_log_file_size = 100M 
#innodb_log_buffer_size = 8M 
#innodb_flush_log_at_trx_commit = 1 
#innodb_lock_wait_timeout = 50 

[mysqldump] 
quick 
max_allowed_packet = 100M 

[mysql] 
no-auto-rehash 
# Remove the next comment character if you are not familiar with SQL 
#safe-updates 

[myisamchk] 
key_buffer_size = 3G 
sort_buffer_size = 512M 
read_buffer = 1024M 
write_buffer = 8M 

[mysqlhotcopy] 
interactive-timeout 

dhairya

Answer 1

試試這個（在一個MySQL的會議）：

SET TRANSACTION ISOLATION LEVEL 
READ UNCOMMITTED; 

<place here the blocking query> 

你應該看到的是，SQL has't受阻INSERT