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Apache ShardingSphere can configure system-level configuration through property configuration. This section describes the configuration items in server.yaml.


Name Data Type Description Default Dynamic Update
sql-show (?) boolean Whether to print SQL in logs.
Printing SQL can help developers quickly locate system problems. Logs contain the following contents: logical SQL, authentic SQL and SQL parsing result.
If configuration is enabled,logs will use Topic ShardingSphere-SQL,and log level is INFO。
false True
sql-simple (?) boolean Whether to print simple SQL in logs. false True
kernel-executor-size (?) int Set the size of the thread pool for task processing. Each ShardingSphereDataSource uses an independent thread pool,and different data sources on the same JVM do not share thread pools. infinite False
max-connections-size-per-query (?) int The maximum number of connections that a query request can use in each database instance. 1 True
check-table-metadata-enabled (?) boolean Whether shard metadata is checked for structural consistency when the program is started and updated. false True
proxy-frontend-flush-threshold (?) int Set the I/O refresh threshold for the number of transmitted data items in ShardingSphere-Proxy. 128 True
proxy-hint-enabled (?) boolean Whether Hint is allowed in ShardingSphere-Proxy. Using Hint changes the Proxy’s threading model from IO multiplexing to a separate thread per request, reducing Proxy’s throughput. false True
proxy-backend-query-fetch-size (?) int The number of rows of data obtained when the backend Proxy interacts with databases (using a cursor). A larger number may increase the occupied memory of ShardingSphere-Proxy. The default value of -1 indicates the minimum value for JDBC driver. -1 True
proxy-frontend-executor-size (?) int The number of threads in the Netty thread pool of front-end Proxy. 0 False
proxy-backend-executor-suitable (?) String Options: OLAP and OLTP. The OLTP option may reduce the time overhead when writing packets to the client,but if the number of client connections exceeds proxy-frontend-executor-size,especially with slow SQL, it can cause a longer delay to SQL execution and even block connections to other clients. OLAP True
proxy-frontend-max-connections (?) int The maximum number of clients that can be connected to Proxy. The default value of 0 indicates that there’s no limit. 0 True
sql-federation-type (?) String SQL federation executor type, including: NONE, ORIGINAL, ADVANCED. NONE True
proxy-mysql-default-version (?) String Proxy specifies the MySQL version through configuration files, and the default verison is 5.7.22. 5.7.22 False
proxy-default-port (?) String Proxy specifies the default window through configuration files. 3307 False
proxy-netty-backlog (?) int Proxy specifies the default netty back_log parameter through configuration files. 1024 False
proxy-frontend-database-protocol-type String Proxy front-end protocol type, supports MySQL, PostgreSQL, openGauss "” False

Property configuration can be modified according to DistSQL#RAL. Properties that support dynamic change can take effect immediately. Properties that do not support dynamic change take effect after a restart.


For a complete sample, please refer to server.yaml in ShardingSphere’s repository: