-db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default (default “vt_repl”) -db_server_name string server name of the DB we are connecting to. -db_socket string The unix socket to connect on. If this is specified, host and port will not be used. -db_ssl_ca string want to use SSL for this connection. This will allow you to turn off SSL for all users except for repl, which may have to be turned on for replication that goes over open networks. appdebug credentials

\ -db_app_password msandbox \ -db_dba_user msandbox \ -db_dba_password msandbox \ -db_repl_user msandbox \ -db_repl_password msandbox \ -db_filtered_user msandbox \ -db_filtered_password msandbox \ -db_allprivs_user -db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default (default “vt_repl”) -db_server_name string server name of the DB we are connecting to. -db_socket string The unix socket to connect on. If this is specified, host and port will not be used. -db_ssl_ca string

所以这个队列的体积越⼤， 它能够 记录的写命令就越多， 从服务器断线之后能够快速地重新回到⼀致状态的机会也就越⼤。 Redis 为这个队列设置 的默认⼤⼩为 1 MB ， ⽤户也可以根据⾃⼰的需要， 通过配置选项 repl-backlog-size 来修改这个队列的⼤⼩。 18.4 ⽆需硬盘的复制 正如之前所说， 主服务器在进⾏完整同步的时候， 需要在本地创建 RDB ⽂件， 然后通过套接字将这个 RDB ⽂ 件传送给从服务器。 从服务器的数据同步。 要使⽤⽆需硬盘的复制特性， 我们只需要将 repl-diskless-sync 配置选项的值设置为 yes 就可以了： repl-diskless-sync ⽐如以下代码就展示了如何在启动 Redis 服务器的同时， 启⽤服务器的⽆需硬盘复制特性： $ redis-server --repl-diskless-sync yes 最后要注意的是， ⽆需 可以通过在脚本⾥⾯调⽤ redis.set_repl() 函数并向它传⼊以下四个值来完成： redis.REPL_ALL —— 默认值，将写命令传播⾄ AOF ⽂件以及所有从服务器。 redis.REPL_AOF —— 只将写命令传播⾄ AOF ⽂件。 redis.REPL_SLAVE —— 只将写命令传播⾄所有从服务器。 redis.REPL_NONE —— 不传播写命令。 跟 redis

useSsl: true # db_filtered_use_ssl preferSocket: true repl: user: vt_repl # db_repl_user password: # db_repl_password useSsl: true # db_repl_use_ssl preferSocket: true appdebug: user: vt_appdebug -db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default (default “vt_repl”) -db_server_name string server name of the DB we are connecting to. -db_socket string The unix socket to connect on. If this is specified, host and port will not be used. -db_ssl_ca string

useSsl: true # db_filtered_use_ssl preferSocket: true repl: user: vt_repl # db_repl_user password: # db_repl_password useSsl: true # db_repl_use_ssl preferSocket: true appdebug: user: vt_appdebug -db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default (default “vt_repl”) -db_server_name string server name of the DB we are connecting to. -db_socket string The unix socket to connect on. If this is specified, host and port will not be used. -db_ssl_ca string

useSsl: true # db_filtered_use_ssl preferSocket: true repl: user: vt_repl # db_repl_user password: # db_repl_password useSsl: true # db_repl_use_ssl preferSocket: true appdebug: user: vt_appdebug -db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default (default “vt_repl”) -db_server_name string server name of the DB we are connecting to. -db_socket string The unix socket to connect on. If this is specified, host and port will not be used. -db_ssl_ca string

useSsl: true # db_filtered_use_ssl preferSocket: true repl: user: vt_repl # db_repl_user password: # db_repl_password useSsl: true # db_repl_use_ssl preferSocket: true appdebug: user: vt_appdebug that instance with a tablet. This user is then used to login to the external MySQL. -db_repl_user • (default ‘vt_repl’) • Used to setup MySQL replication between shard primary and replica instance types -db_port int tcp port -db_repl_password string db repl password -db_repl_use_ssl Set this flag to false to make the repl connection to not use ssl (default true) -db_repl_user string db repl user userKey (default

все вхождения подстроки в строке. Тип результата: VARCHAR или BLOB Синтаксис: REPLACE (str, find, repl) • Функция полностью поддерживает тестовые BLOB с любым набором символов и любой длины; • случае тип результата будет VARCHAR(n), где n является суммой длин параметров str, find и repl, вычисленной таким образом, что даже максимально возможное число замен не будет приводить find является пустой строкой, то результатом будет неизменённая входная строка str; • Если repl является пустой строкой, то из входной строки str будут удалены все вхождения find; • Если один из

want to use SSL for this connection. This will allow you to turn off SSL for all users except for repl, which may have to be turned on for replication that goes over open networks. appdebug credentials queries: • db_dba_user • db_dba_password • db_dba_use_ssl repl credentials are for managing replication. • db_repl_user • db_repl_password • db_repl_use_ssl filtered credentials are for performing resharding:

want to use SSL for this connection. This will allow you to turn off SSL for all users except for repl, which may have to be turned on for replication that goes over open networks. appdebug credentials queries: • db_dba_user • db_dba_password • db_dba_use_ssl repl credentials are for managing replication. • db_repl_user • db_repl_password • db_repl_use_ssl filtered credentials are for performing resharding: