slow queries on the Grafana dashboard #33893 • Fix the issue that the system variable max_allowed_packet does not take effect #31422 • Fix the issue of memory leak in the TopSQL module #34525 #34502 • • HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” 2.6.2 Features that are different from MySQL 2.6.2.1 Auto-increment ID • In TiDB, auto-incremental connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any

too high. – Check the TCP panel on the Grafana Node Exporter page to check whether there is any packet loss. 7.6 TiFlash Alert Rules This document introduces the alert rules of the TiFlash cluster. Examples. 9.1.1.1.3 BCC/bpftrace Starting from CentOS 7.6, the Linux kernel has supported Berkeley Packet Filter (BPF). Therefore, you can choose proper tools to conduct an in-depth analysis based on the the following aspects in the network packet processing might become the bottleneck and affect performance: • NIC hardware cache: To correctly observe the packet loss at the hardware level, use the ethtool

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” 2.4.2 Features that are different from MySQL 2.4.2.1 Auto-increment ID • In TiDB, the values connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” • Descending Index #2519 • SKIP LOCKED syntax #18207 • Lateral derived tables #40328 2.4.2 Differences connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” • Descending Index #2519 • SKIP LOCKED syntax #18207 • Lateral derived tables #40328 2.4.2 Differences connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” 2.4.2 Differences from MySQL 2.4.2.1 Auto-increment ID 96 • In TiDB, the auto-incremental column connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” • Descending Index #2519 • SKIP LOCKED syntax #18207 • Lateral derived tables #40328 2.4.2 Differences connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” • Descending Index #2519 • SKIP LOCKED syntax #18207 • Lateral derived tables #40328 2.4.2 Differences connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

• HANDLER statement • CREATE TABLESPACE statement • “Session Tracker: Add GTIDs context to the OK packet” • Descending Index #2519 • SKIP LOCKED syntax #18207 • Lateral derived tables #40328 2.4.2 Differences connections for keep-alive. If you often see the following error in your Java application: The last packet sent successfully to the server was 3600000 milliseconds ago �→ . The driver has not received any parameter. It is a MySQL Connector/J parameter used for debugging that will keep the buffer of the data packet. This might cause the connection to close unexpectedly. DO NOT turn it on. Way to avoid Do not

too high. – Check the TCP panel on the Grafana Node Exporter page to check whether there is any packet loss. 7.6 TiFlash Alert Rules This document introduces the alert rules of the TiFlash cluster. Examples. 9.1.1.1.3 BCC/bpftrace Starting from CentOS 7.6, the Linux kernel has supported Berkeley Packet Filter (BPF). Therefore, you can choose proper tools to conduct an in-depth analysis based on the the following aspects in the network packet processing might become the bottleneck and affect performance: • NIC hardware cache: To correctly observe the packet loss at the hardware level, use the ethtool