标签归档：MySQL

MySQL类型不匹配导致的慢查询

这是个慢查询

SELECT *, `user_id` as uid
FROM (`journals`)
WHERE `user_id` IN ('1456870', 2573141) -- 字符串
AND `status` =  1
ORDER BY `id` desc
LIMIT 20

这个则不是

SELECT *, `user_id` as uid
FROM (`journals`)
WHERE `user_id` IN (1456870, 2573141) -- 数字
AND `status` =  1
ORDER BY `id` desc
LIMIT 20

13.4.2.1 CHANGE MASTER TO Syntax 

HANGE MASTER TO option [, option] ...

option:
    MASTER_BIND = 'interface_name'
  | MASTER_HOST = 'host_name'
  | MASTER_USER = 'user_name'
  | MASTER_PASSWORD = 'password'
  | MASTER_PORT = port_num
  | MASTER_CONNECT_RETRY = interval
  | MASTER_RETRY_COUNT = count
  | MASTER_DELAY = interval
  | MASTER_HEARTBEAT_PERIOD = interval
  | MASTER_LOG_FILE = 'master_log_name'
  | MASTER_LOG_POS = master_log_pos
  | MASTER_AUTO_POSITION = {0|1}
  | RELAY_LOG_FILE = 'relay_log_name'
  | RELAY_LOG_POS = relay_log_pos
  | MASTER_SSL = {0|1}
  | MASTER_SSL_CA = 'ca_file_name'
  | MASTER_SSL_CAPATH = 'ca_directory_name'
  | MASTER_SSL_CERT = 'cert_file_name'
  | MASTER_SSL_CRL = 'crl_file_name'
  | MASTER_SSL_CRLPATH = 'crl_directory_name'
  | MASTER_SSL_KEY = 'key_file_name'
  | MASTER_SSL_CIPHER = 'cipher_list'
  | MASTER_SSL_VERIFY_SERVER_CERT = {0|1}
  | IGNORE_SERVER_IDS = (server_id_list)

server_id_list:
    [server_id [, server_id] ... ]

STOP SLAVE; -- if replication was running
CHANGE MASTER TO MASTER_PASSWORD='new3cret';
START SLAVE; -- if you want to restart replication

实例：

stop slave;
CHANGE MASTER TO
 MASTER_HOST = 'master',
 MASTER_USER = 'repl',
 MASTER_PASSWORD = 'xxxxxxxx',
 MASTER_PORT = 3306,
 MASTER_LOG_FILE ='mysql-bin.005029',
 MASTER_LOG_POS =0;
set global replicate_do_db = 'doufu';
set global replicate_ignore_db ='mysql,information_schema,performance_schema';
start slave;
show slave status;
show variables like '%Replicate%';