10.2.0.4.0 Two Node RAC - Collection Cause Database Performance To Go Down In AWR?
Jul 16, 2012
we had an issue with our 10.2.0.4.0 two node RAC Database where when running stats collection caused the database performance to go down and in AWR I noticed the following:
Top 5 Timed Events
Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class
gc buffer busy 95,077 73,786 776 76.0 Cluster
cursor: pin S wait on X 3,524,808 54,467 15 56.1 Concurrency
library cache lock 30,223 13,660 452 14.1 Concurrency
gc cr request 2,876 3,594 1,250 3.7 Cluster
library cache pin 1,740 1,800 1,035 1.9 Concurrency
when looked under Library Cache Activity section in the AWR report, I see the following:
Namespace Get Requests Pct Miss Pin Requests Pct Miss Reloads Invali- dations
BODY 59 3.39 3,056 0.13 1 0
CLUSTER 70 0.00 73 0.00 0 0
INDEX 178 0.00 925 0.00 0 0
SQL AREA 423,064 50.25 2,465,209 2.37 182 119,671
TABLE/PROCEDURE 1,848 21.27 22,638 0.62 70 0
TRIGGER 14 0.00 1,801 0.06 1 0
does this mean, we are having memory crunch for this instance on node 1? we have sga_target=26gb and sga_max_size=32gb set for this instance.
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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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Feb 13, 2013
I have two tables with same columns(15 of them), I am trying to find difference between two tables using minus operator and then insert in stage table using below code
Issue is table1 has 50 million records
table2 is empty
so when first time when we execute this v_collection1,v_collection2 collection will have 50 million records in it which will go in memory, I think this is not good, because going in memory will eat memory and resources while sorting and other activities ?
After fetching records in collection we are inserting that in stage table and then COMMIT so i think that wont be good because committing 50 million will generate large amount of redo?
below is snippet of my code
DECLARE
type lst_collection1
IS
TABLE OF table1.col1%type INDEX BY binary_integer;
type lst_collection2
IS
[code].......
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Jul 25, 2012
I tried to clone a 2 node rac database to single instance non rac database using existing backup. I have not used connectivity to target or catalog. rman duplicate finished with below messages:
rman auxiliary sys/******@dbracdup
RMAN> duplicate database to dbrac spfile backup location '/oracle/backup';
...
...
Finished recover at 25-JUL-12
Segmentation fault
And the database was in mount stage, and when i tried to open database it failed with below error:
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-19838: Cannot use this control file to open database .
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Sep 25, 2013
DB Used : Oracle 10g.
A table X : NUM, INST are column names
NUM ----- INST
1234 ----- 23,22,21,78
2235 ----- 20,7,2,1
1298 ----- 23,22,21,65,98
9087 ----- 20,7,2,1
-- Based upon requirement :
1) Split values from "INST" Column : suppose 23
2) Find all values from "NUM" column for above splitted value i.e 23 ,
Eg:
For Inst : 23 ,
It's corresponding "NUM" values are : 1234,1298
3) Save these values into
A table Y : INST, NUM are column names.
INST NUM
23 1234,1298
1) I have a thousand records in Table X , and for all of those records i need to split and save data into Table Y.Hence, I need to do this task with best possible performance.
2) After this whenever a new data comes in Table X, above 'split & save' operation should automatically be called and append corresponding data wherever possible..
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Jul 31, 2012
based on a provided list of key values, joining the collected list against a source table to retrieve additional information related to the key. In this simple example, the procedure accepts a list of employee numbers. The goal is to print a list of names associated with those numbers.
The method is to materialize the list of employee numbers as rows and join those rows to a source table to get the names. I have used BULK COLLECT. Why we cannot cast PLSQL tables using a type defined in the procedure's specification (why the type needs to exist as an object before we can cast it, like this:
SELECT * FROM TABLE ( CAST ( SOME_FUNCTION(&some parameter) AS SOME_TYPE ) );
here is my demo SQL, which you should be able to execute against the SCOTT schema without any change
declare
type employee_numbers is table of emp.empno%type index by binary_integer;
type employee_names is table of emp.ename%type index by binary_integer;
type employees_record is record (empno employee_numbers, person_name employee_names);
records employees_record;
[code]...
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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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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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Jun 1, 2013
We have an Oracle 9i (9.2.0.7) two-node RAC database running on Solaris 5.8. Recently we have switched our production database from no archive log mode to archive log. We changed the parameter CLUSTER_DATABASE=FALSE on one of the instances before converting and reverted back.why this parameter needs to be changed to false?
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Feb 2, 2013
here we have san server and rac database two node database.i want to know how can i create directory on rac database. i know how to create directory on single database but i do not know how can i create directory on rac database.
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Aug 17, 2012
We have 5 node RAC database. I want to user 2 node for OLTP and 3 for DSS system. Guide now to create service for the requirement.
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May 23, 2012
we encounter a problem with a 2-nodes RAC with 11gR2 SE : Database RAC is correctly running but we encounter problems using RAC TNS entry, obtaining the message ORA-01033.We can access to the DB using a TNS entry using each one of IP addresses but when we use the SCAN address, it fails. 2 weeks ago RAC2 node could connect perfectly with the SCAN address but RAC1 (used as a client) obtained error message almost 30% of tries.
We made a reboot of RAC1 node and now SCAN address works correctly from RAC1 and RAC2 (used as a client) fails systematically with SCAN address but works perfectly with direct access to the database.On both nodes, SCAN address is perfectly resolved by DNS server, cluster seems correct, listeners seems correct...We have opened an SR on Metalink 4 weeks ago but we don't progress.
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Apr 30, 2010
i'm trying to duplicate my RAC database with ASM and 2 nodes to a single node, non ASM with rman duplicate database for standby with active database on windows. The problem is i dont know how to remove RAC configuration when duplicating the database.
Here is the procedure:
On standby i've:
- installed database software,
- configured listener and tnsnames,
- added instance service (oradim -new -sid STANDBY -intpwd PASSWORD -startmode M),
- configured initora (with only db_name = STANDBY)
- configured orapwd file
- startup nomount
on RAC node1:
rman target sys/PASSWORD@RAC
connected to target database
RMAN> connect auxiliary sys/password@STANDBY
connected to auxiliary database: STANDBY (not mounted)
now for the duplicate command:
RMAN> duplicate target database
2> for standby
3> from active database
4> spfile
5> parameter_value_convert = '+DATA/RAC','D:\oracle\11.2.0\DATAFILES\DATA\STANDBY'
6> set db_unique_name='STANDBY'
7> set log_file_name_convert = '+DATA/RAC','D:\oracle\11.2.0\DATAFILES\DATA\STANDBY'
8> set db_file_name_convert = '+DATA/RAC','D:\oracle\11.2.0\DATAFILES\DATA\STANDBY';
i have tried adding this parameter - set cluster_database='false' but no luck.
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Jun 10, 2012
<RCA>
<SUB_PROBLEM_TYPE>
Bla bla bla...............
</SUB_PROBLEM_TYPE>
[Code]....
I wish to generate in my html form like..
PREVENTION: bla bla bla....
Is there any simple way to query out ?
I try
"SELECT T1.root_cause_analysis.query('/RCA/PREVENTION') as RCAXML from Submission_Record.............."
set rx=server.createobject("adodb.recordset")
rx.open sqlxmltest,con,1,3
while not rx.eof
<table>
<tr>
<td ><% response.write rx("RCAXML")%></td>
</tr>
</table>
BUT IT GIVE ME AN ERROR... [ORA-22806: not an object or REF]
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Oct 28, 2010
We have to configure Dataguard for our 24x7 critical banking 2 Node RAC database(10.2.0.4). Before proceeding with the configuration we have to make sure what steps we should follow to have minimum or no downtime.
1) Document covering DG setup in RAC environment.
2) We have to perform switchover as well so need its steps too. Either the normal switchover steps would be used or have to stop/start rac services as well.
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Sep 20, 2012
There is a nested table with in a nested table type and i want to print the value and again assign a new value to the next subscript and i have tried a lot but couldn't find any solution.
declare
type type_name is table of varchar2(10);
type type_name1 is table of type_name;
names type_name1:=type_name1(type_name('hello'));
begin
-----HOW TO PRINT A VALUE--------
-----HOW TO ASSIGN A NEW VALUE TO NEW SUBSCRIPT
null;
end;
1) need to print the values of names(1)
2)Assign a value to names(2)
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Nov 15, 2010
Testing our 9i to 11g upgrade, we've imported the entire DB into the new machine.We've found that certain procedures are really suffering performance problems. BUT, we've also found, that if we check out a production copy of the procedure from our source code control, and reinstall it, the performance issue goes away. Just alter the procedure and recompiling does NOT work.
The new machine where the 11g database exists is slightly different than the source, but it's not like we have this problem with every procedure. It's only a couple.
any possible reason that we'd have to re-install a procedure to correct a performance problem?
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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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Mar 22, 2013
I am describing a SQL statement to get it's column list:DECLARE
cur NUMBER;
col_cnt INTEGER;
rec_tab DBMS_SQL.DESC_TAB;
[Code]....
Now I need to get out the columns list from rec_tab.col_name and put it to my_colls collection. Have Oracle any build-in to do that?
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Jul 16, 2013
An SQL query is taking a lot of time than usual and not completing even left after hours! The query joins a table with a quite complex view.
The same query in a test database completes in less than 2 mins.
I would like to export the sql plan from test database to prod database.
how to export/import in 10.2.0.4 version for a particular sql statement's execution plan.
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Dec 4, 2012
I m little bit confuse about the MAX VALUE of SEQUENCE. By default it takes max values as 99999999999999999. Will it really effect our database ?
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Jan 19, 2013
We have just migrated our database from 10g to 11g R2. We are using a PLSQL block to gather stats (analyze) which was executing successfully on 10g but giving below error on 11g:
PLSQL
BEGIN
/* Delete statistics */
DBMS_STATS.DELETE_TABLE_STATS( ownname => 'owner_name', tabname=> 'table_name');
/* Gather statistics */
DBMS_STATS.GATHER_TABLE_STATS( OWNNAME => 'owner_name', TABNAME=> 'table_name' ,METHOD_OPT=>'FOR ALL INDEXED COLUMNS', ESTIMATE_PERCENT => DBMS_STATS.AUTO_SAMPLE_SIZE, DEGREE => DBMS_STATS.DEFAULT_DEGREE, CASCADE => TRUE, NO_INVALIDATE => TRUE);
Error report:
ORA-12801: error signaled in parallel query server P057, instance<instance_name> (2)
ORA-12853: insufficient memory for PX buffers: current 958640K, max needed 11666304K
ORA-04031: unable to allocate 65560 bytes of shared memory ("large pool","unknown object","large pool","PX msg pool")
ORA-06512: at "SYS.DBMS_STATS", line 23828
ORA-06512: at "SYS.DBMS_STATS", line 23879
ORA-06512: at line 5
12801. 00000 - "error signaled in parallel query server %s"
*Cause: A parallel query server reached an exception condition.
*Action: Check the following error message for the cause, and consult your error manual for the appropriate action.
*Comment: This error can be turned off with event 10397, in which case the server's actual error is signaled instead.
This block is working successfully when the degree was hardcoded as 8 in 11g. This block is giving error for only 2 partition tables which has 2 million records. Only difference in both the database parameter is CPU COUNT.
10g CPU count = 16 integer
11g CPU count =48 integer (RAC)
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Sep 6, 2010
I used v$locked_object and v$lock query to get the output.. But still I'm an one year exp in ORACLE. How to analyze the output of lock queries. what are the parameters to be analyzed on AWR report.
How to do proper performance checkup in ORACLE database as well analyze it.
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Oct 10, 2012
insight into the overheads for mutally authenticated SSL for database connections? This is over a fast local network, to a RAC cluster, with DB firewall in front. There's always a large element of "it depends"
Information I'm interested in are things like latency for initial session setup and subsequent data transfer. Also the increase in network packet size, and the increase in CPU cost for the database server. I guess there is some implications for session memory usage as well.
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Sep 16, 2013
We've been battling with very slow performance for some time. Herewith a detail description of the problem:
Solaris-11/ZFS/Oracle problem
We purchased Oracle T4-2 servers, and are experiencing some weird performance problems.
Hardware:
T4-2
2 x 600GB HDD per server
128GB memory per server
2 x dual port QLE2562 FO HBAs
IBM V7000 StorWyse data array
2 x CISCO MDS 9148 fibre optic fabric switches
Software:
Solaris 11.1
MPXIO
Solaris 10 branded local zones
ORACLE 10g Enterprise edition
Project for the oracle user:
user.oracle:100::oracle::process.max-file-descriptor=(basic,8192,deny);process.max-stack-size=(priv,32768,deny);project.max-shm-memory=(priv,21474836480,deny)
We received the first server and wanted to migrate our APPB application system and Oracle 10g Standard Edition database from our SUN T5240 to the T4-2.
T4-2 setup � Disk 0:
Global zone: Solaris 11.1 ( ZFS - whole disk for the root pool)
Local zones: On the Solaris 11 environment we built two branded Solaris 10 zones using an Oracle template provided on the Oracle website - solaris-10u11-sparc.bin.
Our complete database resides on the IBM data array, in UFS LUNs.The UFS LUNs were mounted onto ZFS mount-points in the root partition (/), and then LOFS mounted into the zones.
We started with the Solaris 11.1 environment.
1)After a day or two the performance of the database starts deteriorating rapidly. We then stop the database and reboot the machine. After the reboot the performance level is restored.
2)Another huge deterioration in performance happens when we unmount the V7000 LUNs, and reboot to the alternate Solaris, and re-mount the LUNs.
3)What further compounds the issue is that when we start another the database in the second zone, we see another huge performance degradation.
4)We have logged a call with ORACLE. They requested us to gather information which was analysed by them. They did not find anything wrong with the way ORACLE was installed and the setup of the instances.
On Disk 1 we did a Solaris 10 8/11 (Update 10) installation, which we patched with the April 2013 CPU patchset. In this Solaris 10 global zone we built two native Solaris 10 local zones. The Oracle 10g databases were built in the zones (same configurations settings) not in the global zone, onto UFS LUNs. The database in its entirety lives on the IBM V7000 data array. This works fine.
We then received our next T4-2 server.Loaded it again with Solaris 11.1, and upgraded to ORACLE 12c SE Release 12.1.0.1.0 - 64bit12xxx seeing that Oracle 10 is not certified on Solaris 11. To keep things simple, we built two small databases in the ZFS root pool. The complete system now resides on one disk no UFS LUNs to consider, no Fibre Optic fabric, no CISCO switches, no IBM data array, BUT we get the same problem. The system will run for some time and then slow down drastically. Starting the second database slows the system down abnormally.
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Jul 4, 2012
I have one big database which I need to migrate to Oracle, because it rocks with big databases, instead of other databases and when I was made transfer software and all works great except one more think. During this process I found that Oracle normally fill log & undo table, and my question is how to migrate (or can I migrate) database to oracle without filling undo database (deactivate this process) and after that to put database to work normally, because I just need to transfer data as is and from that point Oracle goes on...
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Sep 1, 2013
i am using 11.2.0.3 version of oracle. We have recently migrated to 11g, after 1 month of smooth and comparatively better performance, we are suddenly facing performance issues with our database and it got crashed twice within 5 days. even we didnt push any new code to our database in recent past, atleast after the 11G migration. And after getting feedback from the ORACLE corporation guys , they pointed out about the default database stats gathering job, which was eating most of the CPU, because of the default degree mentioned So it was running in 160 parallel threads causing resource starvation.so we reduce the degree of the stats gathering job to 8 .
But the database crashed again two days back, and rebooted within 3 mins to back to normal, even after this default degree changed to 8. This is happening due to any specific application related sql or anything else.
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Oct 14, 2010
I am doing import and export of database.Before loading data i drop all the tables and import.Is there any issue if we do drop tables and import data frequently.
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