rman备份遇到的设置rman导致数据库变慢的原因
OS: aix 5.3
DB: Oracle 10..2.0.1 RAC数据库相关情况
目前情况：2016年8月23日在********部署rman备份脚本，部署时间是凌晨3点到4点，部署完成之后发现定时脚本执行期间数据库变慢，造成业务无法处理的情况的发生。情况发生后，暂停数据库rman备份脚本，结果当晚未发生数据库变慢的情况。通过取执行脚本的时间段awr报告发现数据库rman消耗性能极大，现需找出原因并且继续部署rman备份。
凌晨3点至4点的awr报告
由此可以发现当时的数据库情况是极其卡顿的。查看当时的alert日志
由此发现alert日志无报错。
查看当时的rman部署脚本无错误。据此可以推测是操作系统的内存参数设置可能不合理以及cup不足的情况导致。
查看操作系统的相关参数：
#lsps -a
Page Space Physical Volume Volume Group Size %Used Active Auto Type
hd6 hdisk0 rootvg 32768MB 5 yes yes lv
# lsattr -El sys0 -a realmem
realmem 16318464 Amount of usable physical memory in Kbytes False
# svmon -G
size inuse free pin virtual
memory 4079616 4064819 14797 655830 2596673
pg space 8388608 370020
work pers clnt
pin 654394 0 1436
in use 2424189 0 1640630
PageSize PoolSize inuse pgsp pin virtual
s 4 KB - 3974259 369284 599862 2505665
m 64 KB - 5660 46 3498 5688
#
# prtconf
System Model: IBM,9133-55A
Machine Serial Number: 0652EEH
Processor Type: PowerPC_POWER5
Number Of Processors: 8
Processor Clock Speed: 1648 MHz
CPU Type: 64-bit
Kernel Type: 64-bit
LPAR Info: 1 06-52EEH
Memory Size: 15936 MB
Good Memory Size: 15936 MB
Platform Firmware level: SF240_320
Firmware Version: IBM,SF240_320
Console Login: enable
Auto Restart: true
Full Core: false
Network Information
Host Name: qdcercdb1
IP Address: 110.10.1.2
Sub Netmask: 255.255.255.0
Gateway: 110.10.1.1
Name Server:
Domain Name:
Paging Space Information
Total Paging Space: 32768MB
Percent Used: 5%
Volume Groups Information
==============================================================================
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 546 7 00..00..00..00..07
hdisk1 active 546 23 00..00..00..00..23
==============================================================================
ora1vg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk2 active 399 3 00..00..00..00..03
==============================================================================
datavg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk3 active 3662 396 00..00..00..00..396
==============================================================================
backupvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk4 active 557 56 00..00..00..00..56
==============================================================================
INSTALLED RESOURCE LIST
The following resources are installed on the machine.
+/- = Added or deleted from Resource List.
* = Diagnostic support not available.
Model Architecture: chrp
Model Implementation: Multiple Processor, PCI bus
+ sys0 System Object
+ sysplanar0 System Planar
* vio0 Virtual I/O Bus
* vsa1 U787B.001.DNWFZT3-P1-T2 LPAR Virtual Serial Adapter
* vty1 U787B.001.DNWFZT3-P1-T2-L0 Asynchronous Terminal
* vsa0 U787B.001.DNWFZT3-P1-T1 LPAR Virtual Serial Adapter
* vty0 U787B.001.DNWFZT3-P1-T1-L0 Asynchronous Terminal
* pci2 U787B.001.DNWFZT3-P1 PCI Bus
* pci7 U787B.001.DNWFZT3-P1 PCI Bus
+ ent0 U787B.001.DNWFZT3-P1-T9 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
+ ent1 U787B.001.DNWFZT3-P1-T10 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)
* pci8 U787B.001.DNWFZT3-P1 PCI Bus
+ usbhc0 U787B.001.DNWFZT3-P1 USB Host Controller (33103500)
+ usbhc1 U787B.001.DNWFZT3-P1 USB Host Controller (33103500)
* pci9 U787B.001.DNWFZT3-P1 PCI Bus
+ ent2 U787B.001.DNWFZT3-P1-C1-T1 10/100/1000 Base-TX PCI-X Adapter (14106902)
* pci10 U787B.001.DNWFZT3-P1 PCI Bus
* pci11 U787B.001.DNWFZT3-P1-C2 PCI Bus
+ lai0 U787B.001.DNWFZT3-P1-C2-T1 GXT135P Graphics Adapter
* pci1 U787B.001.DNWFZT3-P1 PCI Bus
* pci3 U787B.001.DNWFZT3-P1 PCI Bus
+ sisscsia0 U787B.001.DNWFZT3-P1 PCI-X Dual Channel Ultra320 SCSI Adapter
+ scsi0 U787B.001.DNWFZT3-P1-T14 PCI-X Dual Channel Ultra320 SCSI Adapter bus
+ hdisk0 U787B.001.DNWFZT3-P1-T14-L5-L0 16 Bit LVD SCSI Disk Drive (73400 MB)
+ hdisk1 U787B.001.DNWFZT3-P1-T14-L8-L0 16 Bit LVD SCSI Disk Drive (73400 MB)
+ ses0 U787B.001.DNWFZT3-P1-T14-L15-L0 SCSI Enclosure Services Device
+ scsi1 U787B.001.DNWFZT3-P1-T15 PCI-X Dual Channel Ultra320 SCSI Adapter bus
* pci5 U787B.001.DNWFZT3-P1 PCI Bus
+ fcs1 U787B.001.DNWFZT3-P1-C4-T1 FC Adapter
* fcnet1 U787B.001.DNWFZT3-P1-C4-T1 Fibre Channel Network Protocol Device
* fscsi1 U787B.001.DNWFZT3-P1-C4-T1 FC SCSI I/O Controller Protocol Device
* dac1 U787B.001.DNWFZT3-P1-C4-T1-W201400A0B82967C0 1814 DS4700 Disk Array Controller
* rmt0 U787B.001.DNWFZT3-P1-C4-T1-W2002000E111057D4-L0 Other FC SCSI Tape Drive
* pci4 U787B.001.DNWFZT3-P1 PCI Bus
* ide0 U787B.001.DNWFZT3-P1-T16 ATA/IDE Controller Device
+ cd0 U787B.001.DNWFZT3-P4-D2 IDE DVD-ROM Drive
* pci6 U787B.001.DNWFZT3-P1 PCI Bus
+ sa0 U787B.001.DNWFZT3-P1-C5-T1 IBM 8-Port EIA-232/RS-422A (PCI) Adapter
+ tty0 U787B.001.DNWFZT3-P1-C5-T1-L0 Asynchronous Terminal
* pci0 U787B.001.DNWFZT3-P1 PCI Bus
+ fcs0 U787B.001.DNWFZT3-P1-C3-T1 FC Adapter
* fcnet0 U787B.001.DNWFZT3-P1-C3-T1 Fibre Channel Network Protocol Device
* fscsi0 U787B.001.DNWFZT3-P1-C3-T1 FC SCSI I/O Controller Protocol Device
* dac0 U787B.001.DNWFZT3-P1-C3-T1-W201500A0B82967C0 1814 DS4700 Disk Array Controller
+ L2cache0 L2 Cache
+ mem0 Memory
+ proc0 Processor
+ proc2 Processor
+ proc4 Processor
+ proc6 Processor
+ proc8 Processor
+ proc10 Processor
+ proc12 Processor
+ proc14 Processor
* mouse0 U787B.001.DNWFZT3-P1-T8-L1 USB mouse
* kbd0 U787B.001.DNWFZT3-P1-T8-L1 USB keyboard
+ hdisk2 U787B.001.DNWFZT3-P1-C3-T1-W201500A0B82967C0-L0 1814 DS4700 Disk Array Device
+ hdisk4 U787B.001.DNWFZT3-P1-C3-T1-W201500A0B82967C0-L2000000000000 1814 DS4700 Disk Array Device
+ hdisk3 U787B.001.DNWFZT3-P1-C3-T1-W201500A0B82967C0-L1000000000000 1814 DS4700 Disk Array Device
#
# lspv
hdisk0 00048905ad7d08cb rootvg active
hdisk1 00048905df1cec46 rootvg active
hdisk2 00048905e9e32252 ora1vg active
hdisk3 00048905e9e5b340 datavg concurrent
hdisk4 00048905b52b66bb backupvg active
# lsvg backupvg
VOLUME GROUP: backupvg VG IDENTIFIER: 000489050000d60000000156b52c3550
VG STATE: active PP SIZE: 1024 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 557 (570368 megabytes)
MAX LVs: 256 FREE PPs: 56 (57344 megabytes)
LVs: 2 USED PPs: 501 (513024 megabytes)
OPEN LVs: 2 QUORUM: 2
TOTAL PVs: 1 VG DESCRIPTORS: 2
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 1 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size (Dynamic): 1024 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
#
Topas Monitor for host: qdcercdb1 EVENTS/QUEUES FILE/TTY
Tue Aug 30 17:00:07 2016 Interval: 2 Cswitch 3309 Readch 703.4K
Syscall 9788 Writech 17641
Kernel 0.9 |# | Reads 469 Rawin 0
User 14.7 |##### | Writes 164 Ttyout 333
Wait 0.1 |# | Forks 26 Igets 0
Idle 84.3 |######################## | Execs 26 Namei 1114
Runqueue 1.0 Dirblk 0
Network KBPS I-Pack O-Pack KB-In KB-Out Waitqueue 0.0
en2 82.6 140.4 147.8 34.2 48.4
lo0 33.7 8.4 8.4 16.9 16.9 PAGING MEMORY
en0 12.1 42.2 34.7 5.4 6.7 Faults 4166 Real,MB 15936
en1 0.2 1.5 1.0 0.1 0.1 Steals 0 % Comp 60.4
PgspIn 0 % Noncomp 40.1
Disk Busy% KBPS TPS KB-Read KB-Writ PgspOut 0 % Client 40.1
hdisk3 5.4 65.0 9.4 33.7 31.3 PageIn 0
dac1 0.0 65.0 9.4 33.7 31.3 PageOut 0 PAGING SPACE
cd0 0.0 0.0 0.0 0.0 0.0 Sios 0 Size,MB 32768
dac0 0.0 0.0 0.0 0.0 0.0 % Used 4.9
dac0utm 0.0 0.0 0.0 0.0 0.0 NFS (calls/sec) % Free 95.0
hdisk1 0.0 0.0 0.0 0.0 0.0 ServerV2 0
hdisk0 0.0 0.0 0.0 0.0 0.0 ClientV2 0 Press:
hdisk4 0.0 0.0 0.0 0.0 0.0 ServerV3 0 "h" for help
hdisk2 0.0 0.0 0.0 0.0 0.0 ClientV3 0 "q" to quit
dac1utm 0.0 0.0 0.0 0.0 0.0
Name PID CPU% PgSp Owner
oracle 479480 13.3 5.7 oracle
oracle 594296 0.3 5.7 oracle
oracle 508364 0.3 3.9 oracle
gsclvmd 377090 0.2 1.1 root
oracle 491536 0.2 4.7 oracle
crsd.bin 94260 0.1 86.7 root
oracle 364624 0.1 6.0 oracle
oracle 286910 0.1 18.4 oracle
hagsd 278862 0.0 16.3 root
ocssd.bi 213460 0.0 26.7 oracle
sh 172226 0.0 0.6 root
oracle 581746 0.0 5.9 oracle
oracle 516566 0.0 5.9 oracle
# df -g
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/hd4 1.00 0.64 37% 2583 2% /
/dev/hd2 3.00 1.41 53% 38123 11% /usr
/dev/hd9var 2.00 1.65 18% 949 1% /var
/dev/hd3 3.00 2.06 32% 592 1% /tmp
/dev/fwdump 0.12 0.12 1% 4 1% /var/adm/ras/platform
/dev/hd1 1.00 0.99 1% 94 1% /home
/proc - - - - - /proc
/dev/hd10opt 3.00 2.92 3% 2591 1% /opt
/dev/fslv00 20.00 3.09 85% 344498 33% /oracle
/dev/fslv01 98.75 13.30 87% 559 1% /arch
/dev/fslv02 500.00 429.76 15% 9 1% /backup
# ls -lrt /arch
total 807848
-rw-r--r-- 1 oracle oinstall 413562880 Oct 31 2007 backup02.tar
drwxrwxrwx 3 oracle oinstall 4096 Aug 26 04:03 backup
drwxr-xr-x 2 oracle oinstall 40960 Aug 30 14:43 qdcerco
# ls -lrt /backup
total 147152240
drwxr-xr-x 2 oracle oinstall 256 Aug 23 10:14 lost+found
-rw-r----- 1 oracle oinstall 74748534784 Aug 24 00:13 orcl_inc_2kre0ofk_1_1
-rw-r----- 1 oracle oinstall 321904640 Aug 25 04:03 orcl_inc_2mre3qtk_1_1
-rw-r----- 1 oracle oinstall 113664000 Aug 26 04:03 orcl_inc_2pre6f9m_1_1
-rw-r----- 1 oracle oinstall 106930176 Aug 26 04:03 orcl_inc_2qre6f9m_1_1
-rw-r----- 1 oracle oinstall 50880512 Aug 26 04:03 orcl_inc_2ore6f9m_1_1
#
# smtctl
This system is SMT capable.
SMT is currently enabled.
SMT boot mode is not set.
SMT threads are bound to the same physical processor.
proc0 has 2 SMT threads.
Bind processor 0 is bound with proc0
Bind processor 1 is bound with proc0
proc2 has 2 SMT threads.
Bind processor 2 is bound with proc2
Bind processor 3 is bound with proc2
proc4 has 2 SMT threads.
Bind processor 4 is bound with proc4
Bind processor 5 is bound with proc4
proc6 has 2 SMT threads.
Bind processor 6 is bound with proc6
Bind processor 7 is bound with proc6
proc8 has 2 SMT threads.
Bind processor 8 is bound with proc8
Bind processor 9 is bound with proc8
proc10 has 2 SMT threads.
Bind processor 10 is bound with proc10
Bind processor 11 is bound with proc10
proc12 has 2 SMT threads.
Bind processor 12 is bound with proc12
Bind processor 13 is bound with proc12
proc14 has 2 SMT threads.
Bind processor 14 is bound with proc14
Bind processor 15 is bound with proc14
#
# bindprocessor -q
The available processors are: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15----可用逻辑cpu个数
#
# bindprocessor -q
The available processors are: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
# pmcycles -m
CPU 0 runs at 1648 MHz
CPU 1 runs at 1648 MHz
CPU 2 runs at 1648 MHz
CPU 3 runs at 1648 MHz
CPU 4 runs at 1648 MHz
CPU 5 runs at 1648 MHz
CPU 6 runs at 1648 MHz
CPU 7 runs at 1648 MHz
CPU 8 runs at 1648 MHz
CPU 9 runs at 1648 MHz
CPU 10 runs at 1648 MHz
CPU 11 runs at 1648 MHz
CPU 12 runs at 1648 MHz
CPU 13 runs at 1648 MHz
CPU 14 runs at 1648 MHz
CPU 15 runs at 1648 MHz
# prtconf|grep Processors
Number Of Processors: 8-------物理cpu
经上面参数的查看可以发现cpu的逻辑与物理cpu，接下来继续查看数据库方面的设置参数。
#vmo -a
cpu_scale_memp = 8
data_stagger_interval = 161
defps = 1
force_relalias_lite = 0
framesets = 2
htabscale = n/a
kernel_heap_psize = 4096
kernel_psize = 16777216
large_page_heap_size = 0
lgpg_regions = 0
lgpg_size = 0
low_ps_handling = 1
lru_file_repage = 1
lru_poll_interval = 10
lrubucket = 131072
maxclient% = 80
maxfree = 1088
maxperm = 3096448
maxperm% = 80
maxpin = 3291373
maxpin% = 80
mbuf_heap_psize = 65536
memory_affinity = 1
memory_frames = 4079616
memplace_data = 2
memplace_mapped_file = 2
memplace_shm_anonymous = 2
memplace_shm_named = 2
memplace_stack = 2
memplace_text = 2
memplace_unmapped_file = 2
mempools = 2
minfree = 960
minperm = 774111
minperm% = 20
nokilluid = 0
npskill = 65536
npsrpgmax = 524288
npsrpgmin = 393216
npsscrubmax = 524288
npsscrubmin = 393216
npswarn = 262144
num_spec_dataseg = 0
numpsblks = 8388608
page_steal_method = 0
pagecoloring = n/a
pinnable_frames = 3423668
pta_balance_threshold = n/a
relalias_percentage = 0
rpgclean = 0
rpgcontrol = 2
scrub = 0
scrubclean = 0
soft_min_lgpgs_vmpool = 0
spec_dataseg_int = 512
strict_maxclient = 1
strict_maxperm = 0
v_pinshm = 0
vm_modlist_threshold = -1
vmm_fork_policy = 1
vmm_mpsize_support = 1
# aioo -a
minservers = 1
maxservers = 10
maxreqs = 4096
fsfastpath = 0
经过上面的参数查看，发现maxperm% = 80这个参数设置过大，导致文件系统占用大量内存。
修改这个参数之前需要先把minperm% = 20 这个参数调小。
解决方式：
#vmo -p -o minperm%=5
#vmo -p -o maxperm%=20
#vmo -p -o maxclient%=20
调整完成之后重新部署rman备份，问题解决。
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/30134661/viewspace-2124461/，如需转载，请注明出处，否则将追究法律责任。
转载于:http://blog.itpub.net/30134661/viewspace-2124461/
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