Apache Doris Weekly FAQ: Memory Limits, Import Errors, and More
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 ...
Posted on Sun, 14 Jun 2026 17:43:38 +0000 by billmasters
Apache Doris FAQ: JDBC Connection Issues, Data Operations, and System Maintenance
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 ...
Posted on Fri, 15 May 2026 09:56:49 +0000 by cockney