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[RAC Clusterware] database 频繁hang

1^#

发表于 2014-9-17 16:35:08 | 查看: 3411| 回复: 3

本帖最后由 renjixinchina 于 2014-9-17 16:45 编辑

系统:AIX 6.1
数据库:10.2.0.4 RAC
故障描述:
数据库在数据库频繁出现hang,杀掉进程后正常
第一次出怀疑是序列SEQ_SYS没有cache的问题,调整cache后依然出现

Top 5 Timed Events

Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class
enq: SQ - contention    18,877    55,186    2,923    23.4 Configuration
cursor: pin S wait on X    5,414,192    52,972    10    22.4 Concurrency
latch: row cache objects    470,631    48,409    103    20.5 Concurrency
row cache lock    13,778    34,722    2,520    14.7 Concurrency
latch: library cache    136,207    32,988    242    14.0 Concurrency

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alert.txt

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Maclean Liu(刘相兵

2^#

发表于 2014-9-17 19:03:27

10.2.0.4.0+RAC
Hard parses: 6.72/s
Parses: 924.54/s

sql execute elapsed time 97,800.89 41.40
sequence load elapsed time 86,099.64 36.45
hard parse elapsed time 84,005.89 35.56
failed parse elapsed time 10,212.20 4.32

部分出现 failed parse 解析失败

Pool Name Begin MB End MB % Diff
java free memory 106.16 106.16 0.00
java joxlod exec hp 5.65 5.65 0.00
large PX msg pool 1.03 1.03 0.00
large free memory 14.97 14.97 0.00
shared CCursor 1,394.47 1,337.92 -4.06
shared KQR L PO 200.66 -100.00
shared PCursor 945.13 927.50 -1.87
shared free memory 2,229.16 2,576.62 15.59
shared library cache 502.79 487.84 -2.97
shared sql area 10,318.58 10,260.79 -0.56
buffer_cache 13,856.00 13,856.00 0.00
fixed_sga 2.04 2.04 0.00
log_buffer 13.95 13.95 0.00

shared free memory 2,229.16 2,576.62 15.59

shared pool的free memory大幅增长过，shared pool的其他组件都有增长过，是否可能有人手动执行 alter system flush shared_pool?

由于该命令不会记录在alert.log 里所以较难确定。

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renjixinchina

3^#

发表于 2014-9-18 10:02:04

没有执行过alter system flush shared_pool

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baowei1003

4^#

发表于 2014-10-9 17:59:21

alter system flush shared_pool

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