Database status is nor read write
时间: 2024-05-21 20:15:55 浏览: 11
I'm sorry, but I'll need more context to properly assist you with this issue. Could you provide more details about the situation you're facing? What database are you referring to, and what specific error or message are you seeing?
相关问题
create shardingsphere yml,use three databases as master, auto choose one database that is no read only when write
操作,并且在三个数据库之间进行负载均衡。
回答:
您可以使用ShardingSphere的数据库分片功能,来实现将数据分散到三个数据库中,并且在写操作时,自动选择一个可写的数据库。具体地,您可以在ShardingSphere的配置文件中,指定三个数据库作为主数据库,然后使用分库分表的策略将数据分散到这三个数据库中。在进行写操作时,ShardingSphere会自动选择一个可写的数据库,从而实现负载均衡。以下是一个示例配置文件:
```yaml
spring:
datasource:
sharding:
dataSourceNames: master0, master1, master2
rule:
databases:
mydb0:
dataSources:
master0:
url: jdbc:mysql://localhost:3306/mydb0?serverTimezone=UTC&useSSL=false
username: root
password: 123456
master1:
url: jdbc:mysql://localhost:3307/mydb0?serverTimezone=UTC&useSSL=false
username: root
password: 123456
master2:
url: jdbc:mysql://localhost:3308/mydb0?serverTimezone=UTC&useSSL=false
username: root
password: 123456
defaultDataSourceName: master0
props:
sql:
show: true
```
在上面的配置文件中,我们将三个数据库分别命名为 `master0`, `master1` 和 `master2`。然后,在 `databases` 部分,我们指定了 `mydb0` 这个数据库使用了这三个数据库作为主库,这样 ShardingSphere 就能够自动将数据分散到这三个数据库中。
需要注意的是,这里我们使用了默认的分库策略,即按照数据表的分片键值进行分库。如果您需要更精细的控制分库策略,可以在配置文件中进行指定。另外,这里我们并没有涉及读操作,如果您需要读写分离的功能,可以参考 ShardingSphere 官方文档进行配置。
create yml for springboot shardingsphere 5.11,use three datasource,use another database when this is read only on write
Sure, here's an example of a YML file for a Spring Boot application using Shardingsphere 5.11 with three data sources and switching to a read-only database when necessary:
```yml
spring:
shardingsphere:
datasource:
names: ds0, ds1, ds2
ds0:
url: jdbc:mysql://localhost:3306/db_master?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
ds1:
url: jdbc:mysql://localhost:3306/db_slave1?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
ds2:
url: jdbc:mysql://localhost:3306/db_slave2?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
props:
sql:
show: true
sharding:
tables:
user:
actual-data-nodes: ds$->{0..2}.user_$->{0..1}
table-strategy:
inline:
sharding-column: id
algorithm-expression: user_$->{id % 2}
key-generator:
column: id
type: SNOWFLAKE
worker-id: 123
default-database-strategy:
inline:
sharding-column: user_id
algorithm-expression: ds$->{user_id % 3}
master-slave-rules:
ms_ds:
master-data-source-name: ds0
slave-data-source-names: ds1, ds2
read-write-splitting-rules:
right_db:
write-data-source-name: ds0
read-data-source-names: ds1, ds2
load-balance-algorithm-type: ROUND_ROBIN
props:
sql:
show: true
# When in read-only mode, switch to using the read-only database.
# This assumes the read-only database is ds2.
read-only:
enabled: true
data-sources: ds1
replica-query:
enable: true
```
I hope this helps! Let me know if you have any more questions.
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