oracle监听自动重启问题记录
AI 摘要 / TL;DR
oracle监听自动重启问题记录 问题背景 有一段时间,某数据库在整点期间总是会发出几条连接失败的告警，如下 | | | | | 2019 08 14 10:00:22, 29.211.?.?/??db can not connect, Warning from 5.223 mon\ pri\ conn.sh! | 分
来源: https://www.ucloud.cn/yun/130031.html 作者: IT那活儿 发布日期: 发布于2023-01-11 13:20
oracle监听自动重启问题记录
问题背景
有一段时间,某数据库在整点期间总是会发出几条连接失败的告警，如下
| 2019-08-14 10:00:22, 29.211.?.?/??db can not connect, Warning from 5.223-mon_pri_conn.sh! |
分析过程
1.分析监听日志发现监听存在重启行为
| 14-AUG-2019 10:00:16 * (CONNECT_DATA=(SERVICE_NAME=dbinst1)(CID=(PROGRAM=sqlplus)(HOST=localhost.bss_rh6_dqjkj01_35.176)(USER=ftpuser))) * (ADDRESS=(PROTOCOL=tcp)(HOST=29.211.35.176)(PORT=19573)) * establish * dbinst1 * 0 2019-08-14T10:00:17.907210+08:00 14-AUG-2019 10:00:17 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=dbinst1)) * (ADDRESS=(PROTOCOL=tcp)(HOST=29.211.177.93)(PORT=63570)) * establish * dbinst1 * 12518 TNS-12518: TNS:listener could not hand off client connection <-----10:00:17****监听开始异常 TNS-12540: TNS:internal limit restriction exceeded 14-AUG-2019 10:00:17 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=dbinst1)) * (ADDRESS=(PROTOCOL=tcp)(HOST=29.211.31.19)(PORT=43753)) * establish * dbinst1 * 12518 TNS-12518: TNS:listener could not hand off client connection TNS-12540: TNS:internal limit restriction exceeded 14-AUG-2019 10:00:17 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=dbinst1)) * (ADDRESS=(PROTOCOL=tcp)(HOST=29.211.35.160)(PORT=15812)) * establish * dbinst1 * 12518 TNS-12518: TNS:listener could not hand off client connection TNS-12540: TNS:internal limit restriction exceeded .... 14-AUG-2019 10:00:20 * 12582 TNS-12582: TNS:invalid operation TNS-12615: TNS:preempt error Error listening on: (ADDRESS=(PROTOCOL=ipc)(PARTIAL=yes)(QUEUESIZE=1)) 14-AUG-2019 10:00:21 * establish * 1159 TNS-01159: Internal connection limit has been reached; listener has shut down <---10:00:21监听自动重启 TNS-12540: TNS:internal limit restriction exceeded No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=29.211.16.112)(PORT=1521))) No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER))) No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=29.211.16.131)(PORT=1521))) 2019-08-14T10:00:46.748331+08:00 System parameter file is /u01/app/12.2.0/grid/network/admin/listener.ora ---异常前每秒短连接 11 14-AUG-2019 09:59:55 1 14-AUG-2019 09:59:56 1 14-AUG-2019 09:59:57 1 14-AUG-2019 09:59:59 18 14-AUG-2019 10:00:00 16 14-AUG-2019 10:00:01 13 14-AUG-2019 10:00:02 4 14-AUG-2019 10:00:03 6 14-AUG-2019 10:00:04 10 14-AUG-2019 10:00:05 **<-----**监听重启前存在大量的短连接行为 53 14-AUG-2019 10:00:06 35 14-AUG-2019 10:00:07 47 14-AUG-2019 10:00:08 65 14-AUG-2019 10:00:09 105 14-AUG-2019 10:00:10 61 14-AUG-2019 10:00:11 31 14-AUG-2019 10:00:12 38 14-AUG-2019 10:00:13 5 14-AUG-2019 10:00:15 3 14-AUG-2019 10:00:16 **---**异常整个期间数据库等待事件正常，无明显高消耗 |
2.排查问题期间的os负载情况
| OSWBB_ARCHIVE_DEST /u01/osw/oswbb/archive zzz ***Wed Aug 14 10:00:10 CST 2019 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 31 6 0 446655712 33212 1998720 0 0 1 3 0 0 1 1 98 0 0 21 22 0 446779968 35236 2008236 0 0 16300 96 259964 240440 11 3 83 3 0 25 27 0 446795360 37040 2020368 0 0 29096 48 235608 212541 11 3 82 4 0 zzz ***Wed Aug 14 10:00:24 CST 2019 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 6 18 0 443893696 72420 2204804 0 0 1 3 0 0 1 1 98 0 0 13 12 0 444055840 74432 2228936 0 0 22880 16 90258 85804 5 2 88 6 0 6 17 0 444172864 76036 2250128 0 0 19980 100 70041 61176 4 3 86 7 0 zzz ***Wed Aug 14 10:00:36 CST 2019 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 6 20 0 444360928 83052 2341764 0 0 1 3 0 0 1 1 98 0 0 6 24 0 444552928 83740 2098432 0 0 4436 1212 67242 61741 4 3 85 8 0 125 220 0 444898240 84812 2102292 0 0 3892 1544 174504 140362 12 13 55 19 0 1.10****秒的时候 r21 b22, 该机器为ssd存储，平常cpu-b不到5，这里值已经有点异常 2.36秒的时候出现r 125 b220**，可能为监听重启积压导致，且异常时间点在监听重启后，不能确认是该问题导致故障****。** |
| top - 10:00:36 up 288 days, 14:24, 2 users, load average: 215.59, 68.64, 29.25 Tasks: 8823 total, 15 running, 8808 sleeping, 0 stopped, 0 zombie Cpu(s):8.4%us, 2.2%sy, 0.0%ni, 88.6%id, 0.6%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1058551988k total, 611291252k used, 447260736k free, 87332k buffers Swap: 20971516k total, 0k used, 20971516k free, 2151908k cached 1.近一分钟load达到215**，且较5分钟、15分钟load值出现直线上升。** 2.通常在linux****平台 load avg为系统整体load, 包含 **cpu load, io load等等.**简单理解为 R+D状态的process,不代表cpu使用率，但load高一定存在某一方面的高负载情况. |
| 重点排查一下异常期间的****ps 数据，排除S(sleep)状态进程，可以看到大量的IO相关D进程 [oracle@dbserver1 tmp]$ cat /tmp/ps1024.txt |
问题原因
1.通过与应用侧沟通了解到在整点期间app营业厅会推出抢购活动导致短连接明显的上升
2.主机管理员反馈由于本地盘RAID出现故障盘导致响应异常,以至于大量短连接挂死在ORACLE_HOME的lib库读取上，达到监听队列上限值后引发监听重启.
改进措施
1.推进应用程序短连接进行连接池化整改。
2.更换本地盘为SSD存储提升ORACLE_HOME的读写性能。
注:本次故障版本为oracle12.2，在oracle12c之后的版本中，数据库会持续写出大量的垃圾trace信息不仅影响IO性能且影响文件系统正常使用率,建议多带带指定diag目录以及使用SSD存储安装ORACLE_HOME 。
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