Strategies for dealing with exceptions in Oracle listening servers

Oracle database is a leader in enterprise-level database systems, and its stability and performance have always been recognized by the industry. Oracle listening server (Listener) plays a vital role as the interactive link between Oracle database and client applications. However, sometimes exceptions may occur in the Listener, which may cause the database to be unable to connect normally and have a serious impact on the business system. Therefore, the response strategy for Oracle monitoring server exceptions is crucial.

1. Abnormal situation analysis

1. Listener service stops: When the Listener service stops running, the client cannot connect to the database.
2. Listener service exception: Sometimes although the Listener service is running, network communication abnormalities, configuration errors and other problems may occur, resulting in the inability to properly listen to the database port.
3. Listener service blocking: In high concurrency or complex network environments, the Listener service may be blocked by a large number of connection requests, causing new connections to fail to be established.

2. Basic response strategies

1. Regularly monitor the Listener service status and detect problems in a timely manner;
2. Set an automatic restart mechanism to ensure that the Listener service is available at any time;
3. Optimize network configuration to reduce the possibility of network communication anomalies;
4. Configure load balancing to share the pressure on Listeners;
5. Set a reasonable upper limit on the number of connections to prevent Listeners from being passed over Multiple connection requests are blocked.

3. Specific code examples

1. Monitor the Listener service status:

# 检查Listener服务状态
lsnrctl status

2. Set the automatic restart mechanism:

# 编写脚本，定时检查Listener状态，出现异常自动重启
#!/bin/bash

status=$(lsnrctl status | grep "Listener is running")
if [ -z "$status" ]; then
    lsnrctl start
    echo "Listener restarted at $(date)" >> /path/to/restart_log.txt
fi

3. Configure load balancing:

<!-- 在listener.ora配置文件中添加负载均衡参数 -->
(ADDRESS = (PROTOCOL = TCP)(HOST = server1)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = server2)(PORT = 1521))
(LOAD_BALANCE = yes)

4. Set the upper limit of the number of connections:

<!-- 在sqlnet.ora配置文件中设定连接数上限 -->
SQLNET.SEND_BUF_SIZE=65536
SQLNET.RECV_BUF_SIZE=65536
SQLNET.INBOUND_CONNECT_TIMEOUT=400
SQLNET.OUTBOUND_CONNECT_TIMEOUT=400
SQLNET.SEND_TIMEOUT=360
SQLNET.RECV_TIMEOUT=360
SQLNET.EXPIRE_TIME=10

In summary, for Oracle monitoring The response strategy for server exceptions requires monitoring, automatic restart, network optimization, load balancing, and connection limit to ensure the stability and reliability of the Listener service. At the same time, through actual code examples, these strategies can be better understood and practiced to ensure the normal operation of the database system and the stable development of the business.

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