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19c之前的版本，ORACLE数据库的TXT格式listener log不能被自动循环管理（Mos 1744876.1），给使用者造成了很大负担。
19c开始，导入了一下两个参数：
https://docs.oracle.com/en/database/oracle/oracle-database/19/netrf/oracle-net-listener-parameters-in-listener-ora.html#GUID-FF94A234-A29C-46AA-8770-4CA1BFB5C27C
7.5.3 LOG_FILE_NUM_listener_name
The LOG_FILE_NUM_listener_name is a diagnostic parameter of the listener.ora file that specifies the number of log file segments.
Purpose
To specify the number of log file segments. At any point of time there can be only n log file segments where n is LOG_FILE_NUM_listener_name. If the log grows beyond this number, then the older segments are deleted.
Default
No default. If you don't specify a value, or set the value to zero, then the number of segments grows indefinitely.
Values
Any integer value.
Example 7-9
LOG_FILE_NUM_listener=3
Parent topic: ADR Diagnostic Parameters for Oracle Net Listener
7.5.4 LOG_FILE_SIZE_listener_name
The LOG_FILE_SIZE_listener_name diagnostic parameter of the listener.ora file specifies the size of each log file segment.
Purpose
To specify the size of each log file segment. The size is in MB.
Default
300 MB
Values
Any integer value.
Example 7-10 Example
LOG_FILE_SIZE_listener=10通过上面的参数，TXT格式的listener log和XML格式的listener log一样可以自动循环管理了。
例：
LSNRCTL> stat
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 19-FEB-2021 14:43:38
Uptime 0 days 0 hr. 34 min. 55 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/19.0.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/p19c/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=p19c)(PORT=1521)))
Services Summary...
Service "bba8a80970b42669e0536438a8c0f7fd" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully在/u01/app/oracle/product/19.0.0/db_1/network/admin/listener.ora文件中设置下面两个参数。
oracle@p19c:/u01/app/oracle/product/19.0.0/db_1/network/admin$ cat listener.ora
LOG_FILE_NUM_LISTENER=8
LOG_FILE_SIZE_LISTENER=1
重启监听。
LSNRCTL> stop
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
The command completed successfully
LSNRCTL> start
Starting /u01/app/oracle/product/19.0.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 19.0.0.0.0 - Production
System parameter file is /u01/app/oracle/product/19.0.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/p19c/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=p19c)(PORT=1521)))
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 19-FEB-2021 15:20:51
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/19.0.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/p19c/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=p19c)(PORT=1521)))
The listener supports no services
The command completed successfully
测试一下。
$> vi connect.sh
#!/bin/bash
while ( true ); do
sqlplus -S -L?c##lucifer/lucifer@localhost:1521/cdb << EOF
SELECT * FROM dual;
EXIT;
EOF
done
$> chmod +x connect.sh
$> ./connect.sh > /dev/null
$> ./connect.sh > /dev/null
$> ./connect.sh > /dev/null
$> ...
◆TXT格式listener log
oracle@p19c:/u01/app/oracle/diag/tnslsnr/p19c/listener/trace$ du -sh *
2.0M listener_1.log
488K listener_2.log
192K listener.log
◆XML格式listener log
oracle@p19c:/u01/app/oracle/diag/tnslsnr/p19c/listener/alert$ du -sh *
3.8M log_1.xml
1.1M log_2.xml
448K log.xml
请注意上面的XML格式listener log的大小是1MB，TXT格式listener log却小于1MB。原因是两种格式的Log文件需要记录相同的接续记录，而每一条TXT格式的接续记录比XML格式使用的空间要小。
另外，LOG_FILE_SIZE_listener的默认值是300MB，意味着即使不设置这个参数，XML的 listener log 到了300MB也会自动Rotation。
