RAC Node Down - CPU Utilization Pegged - Options?
Mar 26, 2012
I had one of my RAC nodes go down due to a disk failure. I have a 3 node cluster running 10.2.0.4 on Dell 610's running Windows Server 2008. I have been running AWR reports this afternoon and am seeing CPU time as my top timed event. Here is the exerpt from the report I am looking at:
Cache Sizes
~~~~~~~~~~~ Begin End
---------- ----------
Buffer Cache: 20,032M 20,032M Std Block Size: 8K
Shared Pool Size: 12,688M 12,688M Log Buffer: 6,336K
[code]...
I wanted to ask if there was anything that I could be doing to alleviate the workload on the 2 remaining nodes right now? As far as I understand it there is no way to stop users from hitting the database and without my 3rd node to load balance the CPU will continue to be pegged until the end of the day as the users are logging off.
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May 28, 2013
why CPU utilization is high(99%) on one server in 2 node RAC at every time. On the other server it is very low.
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Jun 15, 2012
current environment
Oracle VM 2 Node RAC cluster
Oracle 11G 11.2.0.3.0
Oracle 11g rel 2 GI
on current 2 node cluster we have GI and RAC db configured Nodes: vmorarac1,vmorarac2
we shutdown vmorarac1 to clone it to vmorarac5
on new node I have changed the hostname to vmorarac5 In /etc/sysconfig/network-scripts/ifcfg-eth0 change ip to new ip and same for /etc/sysconfig/network-scripts/ifcfg-eth1 152.144.199.210,152.144.199.211
mad echanges to /etc/hosts on vmorarac1/2 for 2 new IP address assigned to vmorarac5
152.144.199.171 vmorarac1.pbi.global.pvt vmorarac1
192.168.2.30 vmorarac1-priv.pbi.global.pvt vmorarac1-priv
152.144.199.184 vmorarac1-vip.pbi.global.pvt vmorarac1-vip
[Code]....
Query is is that all ok to reboot the new node to reflect changes as below and change the hostname to vmorarac2
152.144.199.210 vmorarac2.pbi.global.pvt vmorarac2
192.168.2.32 vmorarac2-priv.pbi.global.pvt vmorarac2-priv
152.144.199.211 vmorarac2-vip.pbi.global.pvt vmorarac2-vip
hostname change in /etc/sysconfig/network
On new node vmorarac5, there is alreay software for RAC DB and GUI cloned from vmorarac1
addnode.sh is used to add existing node, but as part of pre-requisite configuratoin is there any config step missing
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Aug 16, 2013
I believe, in a multiple RAC Physical Standby nodes only one node applies the archivelogs to the standby database. How you can find which node is the APPLY NODE using a SQL query?
I know you can veiw this information by querying the standby configuration using DGMGRL but how would you find out this information from a remote client using SQLPlus/PLSQL?
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Jan 24, 2011
We have oracle database 10g(10.2.0.4) running on AIX 5.1. we have installed 2-node RAC on another server AIX 6.1 . Now we want to migrate our single node database to new 2-node rac environment. how we can move/migrate/cluster-aware our single node database to 2-node rac?
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Jul 18, 2013
I am installing Oracle 10g Clusterware in RHEL 5 Server. When i run root.sh in the second node the last step Running vipca(silent) for configuring nodeapps failed. Then i run VIPCA manually in second node and configured vip configuration successfully,but when i checked the post-checks for cluster services the Checking existence of VIP node application,Checking existence of ONS node application and Checking existence of GSD node application in second node failed. I am able to ping both the servers one another with vip name successfully and the CSS,CRS and EVM appears healthy in both nodes. 1. Does the vip configuration is proper? If no what is causing this error and how to rectify it? Find the output below
[root@Rhel52 bin]# ./crsctl check crsCSS appears healthyCRS appears healthyEVM appears healthy[root@Rhel52 bin]#[root@Rhel52 bin]# clear[root@Rhel52 bin]#[root@Rhel52 bin]# ./crs_stat -tName Type Target State Host------------------------------------------------------------------------------------ora.rhel5.gsd application ONLINE ONLINE rhel5ora.rhel5.ons application ONLINE ONLINE rhel5ora.rhel5.vip application ONLINE ONLINE rhel5ora.rhel52.gsd application ONLINE ONLINE rhel52ora.rhel52.ons application ONLINE ONLINE rhel52ora.rhel52.vip application ONLINE ONLINE rhel52 [root@Rhel52 bin]#./runcluvfy.sh stage -post crsinst -n
[code]....
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Sep 13, 2012
I would like get more details about single node RAC.. What is single Node RAC?..
1). just configure only one server instead of two node... same RAC installation.. cluster installation and shared disk configuration in single server itself.. in future we can add node to this ...
2). in 11gR2 having new feature Single Node RAC.. Multiple instances running on same node and configure using Cluster...
is there any advantage using single node rac(other than online upgrade to full RAC).
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Sep 17, 2013
Recently we have upgraded to 11g(11.2.0.3) from 10.2.0.2 on AIX 5.1 enviornment. After upgrade, it has been noticed that CPU utilization is more while executing a program.
CPU is crossing 85% in 11g, in 10g it is 60% during the program execution. I have gone through the SQLs which are getting executed, elapsed time for all SQLs are less than in 10g. i.e. elaspsed for all SQLs in 11 is very less. in AWR report, DB CPU stood in the top.
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Dec 22, 2010
I have to run a resource extensive SQL. It utilizes CPU to a great extent. I've created a new user just to run this particular report. I need to ensure that this particular user doesn't uses more CPU.
Hence, I need to generate an alarm (email) only if a threshold is exceeded for a certain period of time (above x% for y minutes),(example more than 80% for 10 min.), so that I can either kill the process or continue running it depending on CPU usage.
Can I do it using scripts or OEM. I couldn't find any specific metrics to do it in latter. (I'd prefer scripts though. )
My system details are as follows:
1. Database: Oracle 10g R2
2. Unix: Sun OS 5.10
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Jul 16, 2010
how can we monitor the cpu utilization on windows xp.
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Dec 28, 2011
I have a requirement to monitor the PGA utilization with time to time. Provide a good script which will effectively show the pga utilization.
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Jun 14, 2010
we are running a 2 node rac database of oracle 10.2.0.4 in aix 6.3. The shared pool utilisation goes up when we run our jobs and sql statements. But it does not come down. It been 2 gig for over 3 days without any processes running.
Is there a threshold time period after which oracle will release the space utilisation from the shared pool????
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Feb 3, 2012
I'm trying to add the third node to my existing two node cluster. In fact i succeded adding the node but i have the following problem:
-when i start node 1 and 2, everything is ok, but on node 3 startup one of the other nodes fails
-this happens in any combination: start 1 and 3, everything is ok. when i start node 2, node 3 fails
The asm configuration (disks, permissions, etc) is the same on all three nodes.find below the asm and crsd log details from the failure time:
alert_ASM.log
NOTE: enlarging ACD for group 1/0x124851d1 (DATA)
WARNNING: cache read a corrupted block group=DATA dsk=4 blk=1 from disk 4
+NOTE: a corrupted block from group DATA was dumped to /u01/app/oracle/diag/asm/+asm/+ASM3/trace/+ASM3_rbal_4109.trc+
WARNNING: cache read(retry) a corrupted block group=DATA dsk=4 blk=1 from disk 4
[code]...
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Oct 24, 2011
Is there any view in oracle 9i like V$RECOVERY_FILE_DEST where we can check the archive destination space utilization from database end ?
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Nov 27, 2012
The below query is utilizing more than 17 Gb temp space. But still it is getting failed out due to insufficient temp space. is there any way to rewrite this query to reduce the temp utilization?
SELECT T12.FRGHT_AMT_CURCY_CD,T23.LAST_UPD,T11.PAR_OU_ID,T9.MAIN_PH_NUM,T23.DISCNT_PERCENT,T23.X_ERROR_NUM,T18.ADDR,T14.X_ECO_B_END_1141,
T14.X_ECO_A_END_1141,T9.X_ECO_VALIDATION_FLG,T23.X_ECO_ERR_DESCR,T14.ASSET_NUM,T20.NAME,T23.X_ECO_REASON2,T14.X_ECO_B_END_ID,
T14.ASSET_NUM,T14.X_ECO_B_END_IWPC,T23.X_AE_CON_PH_NUM,T23.SHIP_ADDR_ID,T19.NAME,T23.X_BE_CON_LST_NAME,T23.CREATED_BY,T23.X_ECO_LOCATION,T8.LOC,
T3.MODIFICATION_NUM,T10.INTEGRATION_ID,T23.INTEGRATION_ID,T23.X_MESSAGE,T9.PR_ADDR_ID,T12.ACCNT_ID,T23.X_BEARERNO,T23.X_SUB_STATUS_CD,
[code]....
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Mar 27, 2013
I am working on an assignement where client is using Oracle 10g but stuck to using RBO Now the application team, from the GUI available to them build dynamic queries and some of them run very slow.
Neither the code can not be changed to tune the queries nor do we get the exact step in the plan which is an issue (being RBO).For some long running queries the Tuning advisor is not producing any recommendations.
Another hurdle is that all the application users are using same application user id so we can not write a logon trigger to use CBO for some particular queries to see what is happening in the background!
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Apr 13, 2011
In a 3-node RAC setup; one node is showing high CPU utilization around 40~50%. The CPU utilization was less than 20% 10 days back but from 9th oldest day it jumped and consistently shows the double figure. I ran AWR reports on all three nodes and found one node with high CPU utilization and shows below tops events-
EVENT WAITS TIME(S) AVG WAIT(MS) %TOTAL CALL TIME WAIT CLASS
CPU
time 5,802 34.9
RFS
ping 15 5,118 33,671 30.8 Other
Log file sequential
read 234,831 5,036 21 30.3 System I/O
Sql*Net
more data from
client 24,1711,08745 6.5 Network
Db file sequential
read130,939 4533 2.7 User I/O
Findings:-
On AWR report(file attached) for node= sipd207; we can see that "RFS PING" wait event takes 30% of the waits and "log file sequential read" wait event takes 30% of the waits that occurs in database.
1)Are these symptoms of undersized log buffer?
2)I feel Network wait can be reduced by tweaking SDU & TDU values based on MDU.
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Mar 1, 2011
I have a production DB that has the oracle tuning pack option turned on, I occasionally need to clone the DB to a test server where I do not use the tuning pack, If I select from DBA_feature_usage_statistics it tells me that the Options pack is turned on for the Prod db DBID but not for the cloned db dbid. Do I need to worry about this old data being left around in my database? If so is there anyway to remove it? I am running 10.2.0.4
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Jun 20, 2011
steps to export/import a database with options with exp/imp command.i want to acess the exported database table with my current user schema, means actually i had exported a database earlier but i'm not able to access tables directly rather i've to use exported database schema like abc.tablename.
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Dec 28, 2012
materialized view link with all options?
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May 2, 2013
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Jul 22, 2013
I am looking for different cheap storage options to build test RAC setup for DB on Linux@Dell PowerEdge T100 .
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Feb 10, 2012
We have a table with huge data which is skewed on a 'status' column. The 'status' column has 6 distinct values with 1 particular value occupying 80-85% records.
In the batch process we query the data on the status and process the retrieved records. My senior is insisting on partitioning which I see not much feasible considering cost implications just for a part of functionality
See there are 6 status 'A','B','C','D','E','F'
with 'A' occupying 80% records
'B' to 'F' occupies 2% till 14% records in the table(approx)
1) Create a conditional index on status (using case) to have records with all statuses except 'A' Then create If-ELSE structure
IF input parameter is 'A'
select /*+ FULL Parallel(t) */ * from t where status='A';
ELSE
Select /*+ INDEX (t conditional_index) */ * from t where status in ('B','C');
END IF;
I want to create conditional index here for 2 reasons
1] since it will have values for status except 'A' this nullify the chance that this index will be picked up when status='A' will be queried
Thus making the performance worst (status ='A' is for 80% records) - The IF-ELSE is additional protection
2] Less impact on the DMLS as the index will not be on status='A' which contribute to large chunk of records
2)Populate a dummy table which would contain rowid and status. Since the business closes at 21:00 and batch process starts at 21:30
Between these times periods refresh the dummy table every day using merge (to catch business transactions during the day)
Now during the batch process retrieve records from the main table using the rowids in the dummy table depending on the input status value
3)Create index on status
Make sure hard coded status values are used in the database procedures
Gather stats with the histograms
And leave it to the Optimizer to choose the best possible path
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Nov 26, 2012
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Nov 13, 2012
The scale of the tests that generate the following scenario is not huge right now, only 50 users simulated (or you can think of them as independently running threads if you like). But here is the crunch, the queries generated (from generic transaction layer) are all running against a table that has 600 columns! We can't really control this right now, but this is causing masses amounts of IO (5GB per request) making requests queue for disk availability (which are setup RAID 0/1); its even noticable for as few as 3 threads.
I have rendered the SQL on one occasion to execute in 13 seconds for a single user but this appears short lived as when stats were freshly gathered it went up to the normal 90-120 seconds. I've added the original query to the file, however the findings here along with our DBA (who I trust implicitly) suggest that no amount of editing the query will improve the response times, increasing the PGA/SGA (currently 4/6GB respectively) will only delay the queuing for a bit and compression can work either. In short it looks as though we've hit hardware restrictions already for this particular scenario.
As I can't really explain how my rendered query no longer takes 13 seconds, it's niggling me that we might be missing a trick.So I was hoping for some guidance on possible ways of optimising these type of queries against such wide tables, in other words possibilities that we haven't considered...
Attached is the query and plan.
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