RAC Questions
Hello,
I have couple of questions
1) In a two node RAC, if we lost the interconnect between two nodes which one will be part of cluster or which node is evicted? (I think the one with lowest node number will survive, but i am not sure what the "lowest node number" mean)
2) At any given point of time how do we know which node is a master node in a multiple node RAC?
3) I have regular backups of my OCR and VOTEDISKS, but unfortunately if we loose current copies and backup copies of both, how to recover from this kind of scenario? Do we need to rebuild the cluster or do we any other alternative?
4) If my OCR disk is on ASM, if i want to manually take a backup using dd command, is it possible ? as dd is at OS level but as it doesn't undersatnd the ASM path name in "if", how do we do this?
Thanks
925967 wrote:
Hello,
I have couple of questions
1) In a two node RAC, if we lost the interconnect between two nodes which one will be part of cluster or which node is evicted? (I think the one with lowest node number will survive, but i am not sure what the "lowest node number" mean)The node which is added in the first place to the cluster, which means node #1.
2) At any given point of time how do we know which node is a master node in a multiple node RAC?You can use this command grep -i "master node" ocssd.log to find the master node. Another common assumption is to assume that the node that contains the OCR backup is the master node but its not always true.
3) I have regular backups of my OCR and VOTEDISKS, but unfortunately if we loose current copies and backup copies of both, how to recover from this kind of scenario? Do we need to rebuild the cluster or do we any other alternative?If you have lost OCR and have no backup, there is still a way to recover it and its on MOS. I don't have the note with me handy so you got to search for it. I shall see if I can find it and update the reply later.
Update: Have a look at this MOS note 399482.1.
4) If my OCR disk is on ASM, if i want to manually take a backup using dd command, is it possible ? as dd is at OS level but as it doesn't undersatnd the ASM path name in "if", how do we do this?OCR backup by DD? Are you sure you talking about the right thing? The only option where DD was used in the previous versions was for Voting Disk. I never recall that this method was used for OCR as its always auto backed up. The answer to your question in the context of Voting disk is that you can't do it and Oracle has very clearly mentioned attempting to do so would end up in the corruption of the Voting Disk and if you attempt to do so for OCR, I believe the answer remains the same.
HTH
Aman....
Edited by: Aman.... on Aug 3, 2012 9:56 AM
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If you didn't configure node2 and node3 as failover nodes, only the currently connected sessions would failover by the other nodes.
New connections are no longer possible.
Sybrand Bakker
Senior Oracle DBA
Oracle is not about rocket science. It is about being able and willing to read documentation. -
Hi,
Version 11g
I have RAC 11gR2 on two nodes with ASM.
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# This file is used by ORACLE utilities. It is created by root.sh
# and updated by the Database Configuration Assistant when creating
# a database.
# Multiple entries with the same $ORACLE_SID are not allowed.
+ASM2:/u01/app/11.2.0/grid:N # line added by Agent
cstrprd:/u01/app/oracle/product/11.2.0/CSTOREPRD11gR2:N # line added by AgentThe last two lines created by root.sh
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cstrprd2:/u01/app/oracle/product/11.2.0/CSTOREPRD11gR2:N ThanksHi,
if your entry
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. oraenv
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Solaris 10 + Oracle 10gR2 RAC question
Hello everyone
Has anyone come across the case where the CRS services of Oracle cause
the public interface to get turned off and then restored at random
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Solaris 10, Oracle 10gR2 RAC with patch 10.2.0.3 applied. No SUN
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asm, database instances all down) /var/adm/messages show nothing. When
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Thank you for readingIm an Oracle guy - not the SA type -
But on ours - the SA configured this cluster incorrectly. We use veritas. instead of making ipmp groups for the interfaces - he built the cluster according to veritas docs. That is - he has two publics - on difference interfaces and different privates on different interfaces. oracle can only two interfaces - no matter if its a ipmp group or a device name. one is used for private- the other is used for public - So sure the veritas cluster filesystems will survive - but the Oracle Cluster will not - nodes will reboot -
Is your system set up incorrectly as i described above? if it is - a quick test would be - turn down the other interfaces - and only leave the two interfaces you mention above up that you configured for Oracle CRS
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A non-RAC question for the experts: Clusterware + ASM
Hi
We have a 2-nodes cluster in production.
It's an active/passive cluster with a cold failover using SUN Cluster.
There is only one Oracle 10G single-instance database (DB1), running on node #1, that use ASM to access the SAN (it's raw devices).
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node #2: cluster passive node
node #3: DB2 with ASM (new additional database, new raw devices)
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Do I have to install an ASM instance on each node (just like in RAC) ?
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Thanks for your answers.Hi,
Thanks for the answer
I found this very interesting doucument but it does not go into enough details about ASM, which is my concern.
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What happen when I start an ASM instance on node #3 to access raw devices already in use by node # 2.
I think I need to start from node #1 and change some ASM configuratoion to make it cluster-aware.
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Our source and target databases are RAC servers. Is it possible to have OWB installed as single node and still use RAC capabilities of source and target database ?
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We also have a 6 node rac where we settes up owb.
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cheers -
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What are the memory and processor requirements of your 30 databases? Does your cluster have suitable memory and processors to handle all 30 databases? -
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RAC Installation Error CLUSTEREXCEPTION
Dear all RAC Gurus
I have 2 machines / nodes RAC1 and RAC2
I have problem when install oracle rac[cauze i'm newbie in rac]...when i specified cluster configuration cluster name, i got error as
=================================================
The node(s), oradbn1-priv,oradbn2-priv, does not appear to be
reachable via the private node name. The status return by the node
availability check is :
CLUSTEREXCEPTION
Please check that all the nodes in the node list are reachable via both
their public and private node names.
=================================================
My /etc/hosts
on RAC node 1 [the value is same as RAC node 2]
=================================================
[root@rac1 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
#::1 localhost6.localdomain6 localhost6
192.168.184.201 rac1.gis.com rac1
192.168.184.202 rac1-vip.gis.com rac1vip
192.168.1.202 rac1-prv.gis.com rac1prv
192.168.184.211 rac2.gis.com rac2
192.168.184.212 rac2-vip.gis.com rac2vip
192.168.1.212 rac2-prv.gis.com rac2prv
=================================================
on RAC node 1 ifconfig
=================================================
[root@rac1 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:94:E2:69
inet addr:192.168.184.201 Bcast:192.168.184.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe94:e269/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9457 errors:0 dropped:0 overruns:0 frame:0
TX packets:10724 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2042640 (1.9 MiB) TX bytes:1159047 (1.1 MiB)
Interrupt:67 Base address:0x2024
eth0:1 Link encap:Ethernet HWaddr 00:0C:29:94:E2:69
inet addr:192.168.184.202 Bcast:192.168.184.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:67 Base address:0x2024
eth1 Link encap:Ethernet HWaddr 00:0C:29:94:E2:73
inet addr:192.168.1.202 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe94:e273/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:809 errors:0 dropped:0 overruns:0 frame:0
TX packets:1070 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:125940 (122.9 KiB) TX bytes:150904 (147.3 KiB)
Interrupt:67 Base address:0x20a4
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:16936 errors:0 dropped:0 overruns:0 frame:0
TX packets:16936 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6013187 (5.7 MiB) TX bytes:6013187 (5.7 MiB)
=================================================
each node ssh log is ok
wait on line!!!
Could RAC gurus solve the problem???
Thank so Much for any help!!!user3113543 wrote:
Dear all RAC Gurus
I have 2 machines / nodes RAC1 and RAC2
I have problem when install oracle rac[cauze i'm newbie in rac]...when i specified cluster configuration cluster name, i got error as
=================================================
The node(s), oradbn1-priv,oradbn2-priv, does not appear to be First, when asking RAC questions, ALWAYS include the version. Show me in your /etc/hosts file where these names exist????
Before proceeding, From ALL nodes in the cluster, make sure you can successfully connect using the IP address AND hostname AND hostname.FQN.com name using the following command
ssh date <ipaddress>
ssh date <hostname>
etc...
The result should be the date and possibly the /etc/issues file.
this should not prompt to be added to knownhosts file (if it does, answer YES) nor should it prompt you for a password.
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
#::1 localhost6.localdomain6 localhost6
192.168.184.201 rac1.gis.com rac1
192.168.184.202 rac1-vip.gis.com rac1vip
192.168.1.202 rac1-prv.gis.com rac1prv
192.168.184.211 rac2.gis.com rac2
192.168.184.212 rac2-vip.gis.com rac2vip
192.168.1.212 rac2-prv.gis.com rac2prv
Could RAC gurus solve the problem???Yes, WE can, but if you can't then your system will be of little use to you...
Thank so Much for any help!!! -
srvctl
srvconfig
EM
crs_ctl
gsdctl
what other utilities we can use to manage RAC DBs, any body has some notes for RAC Utilies?If you go to http://forums.oracle.com you may note a 'topic' titled 'Grid Computing with a number of RAC related forums. You may ALSO get relevant answers to your RAC question by asking people who are heavily interested in RAC.
In the mean time - your list misses SQLPLUS and RMAN to name a few. -
How to create an asm instance manaually? oracle 11gr2.
env: oracle 11gr2 os: hpux or aix single machine , not rac.
question:how to create an asm instance manaually?? diskgroup,listener,db ,they can be resigistered to crs??
can anyone give me document about it?Hi,
This is a simple answer:
Automatic Storage Management (ASM)
ASM was a new storage option introduced with Oracle Database 10gR1 that provides the services of a filesystem, logical volume manager, and software RAID in a platform-independent manner. ASM can stripe and mirror your disks, allow disks to be added or removed while the database is under load, and automatically balance I/O to remove "hot spots." It also supports direct and asynchronous I/O and implements the Oracle Data Manager API (simplified I/O system call interface) introduced in Oracle9i.
ASM is not a general-purpose filesystem and can be used only for Oracle data files, redo logs, and control files. Files in ASM can be created and named automatically by the database (by use of the Oracle Managed Files feature) or manually by the DBA. Because the files stored in ASM are not accessible to the operating system, the only way to perform backup and recovery operations on databases that use ASM files is through Recovery Manager (RMAN).
ASM is implemented as a separate Oracle instance that must be up if other databases are to be able to access it. Memory requirements for ASM are light: only 64 MB for most systems.
Installing ASM
On Linux platforms, ASM can use raw devices or devices managed via the ASMLib interface. Oracle recommends ASMLib over raw devices for ease-of-use and performance reasons. ASMLib 2.0 is available for free download from OTN. This section walks through the process of configuring a simple ASM instance by using ASMLib 2.0 and building a database that uses ASM for disk storage.
Determine Which Version of ASMLib You Need
ASMLib 2.0 is delivered as a set of three Linux packages:
* oracleasmlib-2.0 - the ASM libraries
* oracleasm-support-2.0 - utilities needed to administer ASMLib
* oracleasm - a kernel module for the ASM library
Each Linux distribution has its own set of ASMLib 2.0 packages, and within each distribution, each kernel version has a corresponding oracleasm package. The following paragraphs describe how to determine which set of packages you need.
First, determine which kernel you are using by logging in as root and running the following command:
uname -rm
Ex:
# uname -rm
2.6.9-22.ELsmp i686
The example shows that this is a 2.6.9-22 kernel for an SMP (multiprocessor) box using Intel i686 CPUs.
Use this information to find the correct ASMLib packages on OTN:
1. Point your Web browser to http://www.oracle.com/technology/tech/linux/asmlib/index.html
2. Select the link for your version of Linux.
3. Download the oracleasmlib and oracleasm-support packages for your version of Linux
4. Download the oracleasm package corresponding to your kernel. In the example above, the oracleasm-2.6.9-22.ELsmp-2.0.0-1.i686.rpm package was used.
Next, install the packages by executing the following command as root:
rpm -Uvh oracleasm-kernel_version-asmlib_version.cpu_type.rpm \
oracleasmlib-asmlib_version.cpu_type.rpm \
oracleasm-support-asmlib_version.cpu_type.rpm
Ex:
# rpm -Uvh \
> oracleasm-2.6.9-22.ELsmp-2.0.0-1.i686.rpm \
> oracleasmlib-2.0.1-1.i386.rpm \
> oracleasm-support-2.0.1-1.i386.rpm
Preparing... ########################################### [100%]
1:oracleasm-support ########################################### [ 33%]
2:oracleasm-2.6.9-22.ELsm########################################### [ 67%]
3:oracleasmlib ########################################### [100%]
Configuring ASMLib
Before using ASMLib, you must run a configuration script to prepare the driver. Run the following command as root, and answer the prompts as shown in the example below.
# /etc/init.d/oracleasm configure
Configuring the Oracle ASM library driver.
This will configure the on-boot properties of the Oracle ASM library
driver. The following questions will determine whether the driver is
loaded on boot and what permissions it will have. The current values
will be shown in brackets ('[]'). Hitting <ENTER> without typing an
answer will keep that current value. Ctrl-C will abort.
Default user to own the driver interface []: oracle
Default group to own the driver interface []: dba
Start Oracle ASM library driver on boot (y/n) [n]: y
Fix permissions of Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: [ OK ]
Creating /dev/oracleasm mount point: [ OK ]
Loading module "oracleasm": [ OK ]
Mounting ASMlib driver filesystem: [ OK ]
Scanning system for ASM disks: [ OK ]
Next you tell the ASM driver which disks you want it to use. Oracle recommends that each disk contain a single partition for the entire disk. See Partitioning the Disks at the beginning of this section for an example of creating disk partitions.
You mark disks for use by ASMLib by running the following command as root:
/etc/init.d/oracleasm createdisk DISK_NAME device_name
Tip: Enter the DISK_NAME in UPPERCASE letters.
Ex:
# /etc/init.d/oracleasm createdisk VOL1 /dev/sdb1
Marking disk "/dev/sdb1" as an ASM disk: [ OK ]
# /etc/init.d/oracleasm createdisk VOL1 /dev/sdc1
Marking disk "/dev/sdc1" as an ASM disk: [ OK ]
# /etc/init.d/oracleasm createdisk VOL1 /dev/sdd1
Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
Verify that ASMLib has marked the disks:
# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
Create the ASM Instance
ASM runs as a separate Oracle instance which can be created and configured using the Oracle Universal Installer. Now that ASMLib is installed and the disks are marked for use, you can create an ASM instance.
Log in as oracle and start runInstaller:
$ ./runInstaller
1. Select Installation Method
* Select Advanced Installation
* Click on Next
2. Specify Inventory Directory and Credentials
* Inventory Directory: /u01/app/oracle/oraInventory
* Operating System group name: oinstall
* Click on Next
3. Select Installation Type
* Select Enterprise Edition
* Click on Next
4. Specify Home Details
* Name: OraDB10gASM
* Path: /u01/app/oracle/product/10.2.0/asm
Note:Oracle recommends using a different ORACLE_HOME for ASM than the ORACLE_HOME used for the database for ease of administration.
* Click on Next
5. Product-specific Prerequisite Checks
* If you've been following the steps in this guide, all the checks should pass without difficulty. If one or more checks fail, correct the problem before proceeding.
* Click on Next
6. Select Configuration Option
* Select Configure Automatic Storage Management (ASM)
* Enter the ASM SYS password and confirm
* Click on Next
7. Configure Automatic Storage Management
* Disk Group Name: DATA
* Redundancy
- High mirrors data twice.
- Normal mirrors data once. This is the default.
- External does not mirror data within ASM. This is typically used if an external RAID array is providing redundancy.
* Add Disks
The disks you configured for use with ASMLib are listed as Candidate Disks. Select each disk you wish to include in the disk group.
* Click on Next
8. Summary
* A summary of the products being installed is presented.
* Click on Install.
9. Execute Configuration Scripts
* At the end of the installation, a pop up window will appear indicating scripts that need to be run as root. Login as root and run the indicated scripts.
* Click on OK when finished.
10. Configuration Assistants
* The Oracle Net, Oracle Database, and iSQL*Plus configuration assistants will run automatically
11. End of Installation
* Make note of the URLs presented in the summary, and click on Exit when ready.
12. Congratulations! Your new Oracle ASM Instance is up and ready for use.
Kind regards
Mohamed -
Hi,
I Am using the t3 protocol to connect to the server in the BEA weblogic, now
I am porting my beans to IPLANET, now how can I make use of the Attached
piece of java code, the file makes use of the table called "ts_lookup".
java file
package com.se.util;
import javax.naming.*;
import java.util.*;
import javax.sql.*;
import java.sql.*;
import javax.ejb.EJBException;
@author Author
public class Lookup extends Object
@roseuid 39EAE91F015B
public static java.lang.Object getHomeObject(String lookUpID) throws
java.rmi.RemoteException, EJBException
Connection con = null;
PreparedStatement ps = null;
String initialContextFactory = null;
String providerURL = null;
String securityPrincipal = null;
String securityCredentials = null;
String jndiName = null;
try {
con = getConnection();
ps = con.prepareStatement("SELECT * FROM tu_lookup WHERE lookUpID = ?");
ps.setString(1, lookUpID);
ResultSet rs = ps.executeQuery();
file://ResultSet rs = ps.getResultSet();
if (rs.next()) {
initialContextFactory = rs.getString("initialContextFactory");
providerURL = rs.getString("providerURL");
securityPrincipal = rs.getString("securityPrincipal");
securityCredentials = rs.getString("securityCredentials");
jndiName = rs.getString("jndiName");
} else {
String error = lookUpID + " not found in table tu_lookup";
System.out.println(error);
throw new EJBException (error);
} catch (SQLException sqe) {
System.out.println("SQLException: " + sqe);
throw new EJBException(sqe);
finally {
cleanup(con, ps);
Object homeObj =null;
try {
// Get an InitialContext
Properties h = new Properties();
h.put(Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);
h.put(Context.PROVIDER_URL, providerURL);
if (securityPrincipal != null) {
h.put(Context.SECURITY_PRINCIPAL, securityPrincipal);
if (securityCredentials == null)
securityCredentials = "";
h.put(Context.SECURITY_CREDENTIALS, securityCredentials);
Context ctx = new InitialContext(h);
homeObj = ctx.lookup(jndiName);
} catch (NamingException ne) {
file://call the exception handler
System.out.println("NamingException: " + ne);
throw new EJBException(ne);
return homeObj;
* Gets current connection to the connection pool.
* @return Connection
* @exception javax.ejb.EJBException
* if there is a communications or systems failure
public static Connection getConnection()
throws SQLException
String poolName = null;
InitialContext initCtx = null;
try {
ResourceBundle rs =
ResourceBundle.getBundle("com.se.properties.Lookup");
Hashtable p = new Hashtable();
p.put(Context.INITIAL_CONTEXT_FACTORY,
rs.getString("INITIAL_CONTEXT_FACTORY"));
p.put(Context.PROVIDER_URL, rs.getString("PROVIDER_URL"));
poolName = rs.getString("CONNECTION_POOL_NAME");
initCtx = new InitialContext(p);
DataSource ds = (javax.sql.DataSource) initCtx.lookup(poolName);
return ds.getConnection();
} catch(MissingResourceException mre) {
System.out.println("UNABLE to find the Lookup.properties file");
throw new EJBException(mre);
} catch(NamingException ne) {
System.out.println("UNABLE to get a connection from "+poolName+"!");
System.out.println("Please make sure that you have setup the connection
pool properly");
throw new EJBException(ne);
} finally {
try {
if(initCtx != null) initCtx.close();
} catch(NamingException ne) {
System.out.println("Error closing context: " + ne);
throw new EJBException(ne);
* Gets current connection to the connection pool.
* @return Connection
* @exception javax.ejb.EJBException
* if there is a communications or systems failure
public static Connection getConnection(String poolName)
throws SQLException
InitialContext initCtx = null;
try {
ResourceBundle rs =
ResourceBundle.getBundle("com.se.properties.Lookup");
Hashtable p = new Hashtable();
p.put(Context.INITIAL_CONTEXT_FACTORY,
rs.getString("INITIAL_CONTEXT_FACTORY"));
p.put(Context.PROVIDER_URL, rs.getString("PROVIDER_URL"));
initCtx = new InitialContext(p);
DataSource ds = (javax.sql.DataSource) initCtx.lookup(poolName);
return ds.getConnection();
} catch(MissingResourceException mre) {
System.out.println("UNABLE to find the Lookup.properties file");
throw new EJBException(mre);
} catch(NamingException ne) {
System.out.println("UNABLE to get a connection from "+poolName+"!");
System.out.println("Please make sure that you have setup the connection
pool properly");
throw new EJBException(ne);
} finally {
try {
if(initCtx != null) initCtx.close();
} catch(NamingException ne) {
System.out.println("Error closing context: " + ne);
throw new EJBException(ne);
public static void cleanup(Connection con, PreparedStatement ps) {
// Having problems with ps.close.
/*try {
if (ps != null) ps.close();
} catch (Exception e) {
System.out.println("Error closing PreparedStatement: "+e);
throw new EJBException (e);
try {
if (con != null) con.close();
} catch (Exception e) {
System.out.println("Error closing Connection: " + e);
throw new EJBException (e);
The structure of the ts_lookup is like this
CREATE TABLE tu_lookup (
lookUpID char(30) NOT NULL ,
initialContextFactory varchar (100) NOT NULL ,
providerURL varchar (100) NOT NULL ,
securityPrincipal varchar (15) NULL ,
securityCredentials varchar (15) NULL ,
jndiName varchar (25) NOT NULL
sample data row for the above table is like this
ItemHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 ItemHome
UnitMasterHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 UnitMasterHome
ShowColumnsHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 ShowColumnsHome
CustomerHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 CustomerHome
CompanyHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 CompanyHome
CountryHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 CountryHome
CustomerMasterHome weblogic.jndi.WLInitialContextFactory
t3://208.28.177.22:7001 CustomerMasterHomehttp://en.wikipedia.org/wiki/User_Datagram_Protocol
http://en.wikipedia.org/wiki/Inter-process_communication
http://en.wikipedia.org/wiki/Infiniband
For your RAC question please refer to the Remote Application Clusters Concepts and Administration Manual for your unknown version.
Also please make sure you do the necessary prior to asking these questions!
Sybrand Bakker
Senior Oracle DBA -
when checkpoint occurs , dirty buffers are written to datafile.
it means that datfile contains both commited and uncommited data.
when commit occurs block may not be in db buffer cache on that time
how database handles the block/transaction?.
how long that uncommited data will be stored in datafile? if it is not going to contain uncommited data for
long time(till commit occurs) is it not overhead for database to contain both commited and uncommited?Hi,
this is more of a general than a RAC question, you should have posted this in the general forum
user10819596 wrote:
when checkpoint occurs , dirty buffers are written to datafile.
it means that datfile contains both commited and uncommited data.
when commit occurs block may not be in db buffer cache on that time
how database handles the block/transaction?.the process is called 'delayed block cleanout'. Google for it, you will find lots of useful and in-depth explanations. Basically what happens is when you commit, the rollback segment/undo information will get marked as committed and the next transaction that visits the changed block will do the cleanup and mark the data block as committed.
how long that uncommited data will be stored in datafile? if it is not going to contain uncommited data for
long time(till commit occurs) is it not overhead for database to contain both commited and uncommited?I don't think I understand your question. Some data will have to be written to disk eventually (before we can re-use a redo log file) and there are also situations where you perform DML on more data that could ever fit into your buffer cache. For those reasons, it cannot be avoided to write uncommitted blocks to the datafile. -
I noticed my machine rebooted itself 3 days ago. Tonight it did the same and this is what I found in panic.log:
Sun Oct 30 19:52:28 2005panic(cpu 1 caller 0x0015E090): tcp_unlock: so=a306760 usecount=ffffffffLatest stack backtrace for cpu 1: Backtrace: 0x00095544 0x00095A5C 0x0002683C 0x0015E090 0x0028FF64 0x0028CEDC 0x0027F9D8 0x0025C034 0x0025C238 0x0025A330 0x0025A090 0x002A7A94 0x000ABCB0 0xDC2D8818 Proceeding back via exception chain: Exception state (sv=0x5EA75C80) PC=0x900138AC; MSR=0x0200F030; DAR=0x0037F88C; DSISR=0x40000000; LR=0x00453E74; R1=0xBFFFBF60; XCP=0x00000030 (0xC00 - System call)Kernel version:Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC*******
Does anyone know how to decipher this or where I should go from here? I have no idea why the machine is rebooting. I have a 3.5TB Xserve RAID connected to it and this machine is running as a webserver.I had a CRS reboot issue on Solaris not too long ago. It ended up being an NTP issue. There are many reasons CRS could cause a node reboot. Possibly there is a timeout talking to the voting disks or OCR.
MetaLink Note:220970.1 is a good place to start for RAC questions. It has a section on Node reboots.
I also check out the CRS alert log and ocssd logs which can all be found in the CRS_HOME/log directory.
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