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SQL Query Management Cancelling Active Sessions Retrieve the running session list and terminate the target statement using its unique identifier. SHOW FULL PROCESSLIST; KILL QUERY <process_identifier>; Alternatively, invoke the management REST endpoint directly: curl -X POST -u "<username>:<password>" http://<bac ...

SQL Queries Q1: Is MySQL's WITH ROLLUP syntax supported? Apache Doris does not currently support the WITH ROLLUP clause. As an alteernative, use the GROUP BY ROLLUP construct: SELECT a, b, c, SUM(d) FROM tab1 GROUP BY ROLLUP(a, b, c); Q2: Why do decimal field queries truncate to six decimal places? By default, decimal values retain six fractio ...

SQL Query Issues Error: "timeout when waiting for send fragments RPC" This error indicates a communication timeout during RPC fragment transmission. To resolve this, follow these steps: Verify network connectivity between nodes. Consider upgrading to version 2.x, as this issue occurs less frequently compared to pre-2.0 versions. Adju ...

SQL Execution and Memory Management Q1: Why does a single SQL query's memory usage not respect the exec_mem_limit setting? A1: The exec_mem_limit parameter governs the maximum memory allocated per query fragment instance within a query plan. A single query plan may involve multiple instances, each executed on one or more Backend (BE) nodes. As ...

SQL Query Issues Q: JDBC Connection Failure Error When executing queries, users may encounter the following error: [HY000][1105] Can not connect to jdbc due to error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Recommended troubleshooting steps: Add autoReconnect=true parameter to the JDBC URL and set ...