Is user equivelance really required at the OS level after RAC installation?

Posted on December 18, 2008. Filed under: Database, DBA/Admin Tips, Operating System, RAC, TroubleShooting, Uncategorized | Tags: , , , |

A wild though came to my head late this evening about the user equivelance in RAC. What will happen if i remove the user equivelance for the oracle home owner between the RAC nodes. What do you think – will this mess up the normal operation of the database ???

BTW, User Equivelance = Ability to ssh between rac nodes without password.


DB Name : opitstop
DB Owner : orapstop


1. srvctl stop database -d OPITSTOP
2. cd $HOME/.ssh && mv authorized_keys authorized_keys_old [ authorized_keys file holds the rsa/dsa keys, which enables ssh to other boxes without password]

At this stage, opitstop DB is down and RAC_NODE_2 cannot ssh to RAC_NODE_1 since RAC_NODE_1 authorized_keys file had been moved.


cd $HOME/.ssh && mv authorized_keys authorized_keys_old

Now both the nodes cannot do ssh between them without password.


Lets start the database, using srvctl to see if it errors out

srvctl start database -d OPITSTOP

NOPE, it doesnt … it works as before, started the instances on both RAC_NODE_1 and RAC_NODE_2.

At this stage in the alert log file, the database was able to get information about the other node and a select on gv$instance shows both instances too. I let the db to run for sometime … still there was no error.

Now lets revert back the user equivelance on both nodes.

orapstop@RAC_NODE_1: cd $HOME/.ssh && mv authorized_keys_old authorized_keys
orapstop@RAC_NODE_2: cd $HOME/.ssh && mv authorized_keys_old authorized_keys

So based on this excercise my conclusion is, user equivelance is required only for RAC installation’s / RAC binary upgrades viz., to or 4 / patching using opatch option napply and not for normal operations of the database.

Oh yeah, its a good feeling to mess up with the setup and to get it back working.

Happy Messing !!!


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dbca – Creating RAC Database using dbca in silent mode

Posted on December 16, 2008. Filed under: Database, DBA/Admin Tips, Linux, RAC, TroubleShooting | Tags: , , |

During the course of the DBA life, we all know how irritating it is to create a DB or to install a Oracle Software on a UNIX Flavour box from a remote machine using a X РServer. Each click would take minutes to react (My favourite is the tab button on the keyboard) but still at-times we have to make use of the mouse. Anyways, recently we installed 10203 on a HP server which already has cluster setup. Everything went good in terms of 10201 installation, 10203 upgrade (both binaries) and even dbca 14 screens. But nothing happened when clicked on the finish button in dbca (14th screen). No useful information in the log files. I pressed cancel and re-launched it again and did the dbca exercise all the way till the end, still no luck. By this time my patience level was minus 25.  It is at this stage i thought how about creating the database in silent mode and you know what, creating the DB in silent mode is 200 times faster than the GUI and the db creation completed in less than 5 minutes.

Syntax to create a General Purpose RAC Database on a Cluster File System.

dbca -silent -createDatabase -templateName General_Purpose.dbc -gdbName opitstop -sid opitstop -sysPassword opitstop123 -systemPassword opitstop123 -emConfiguration NONE -datafileDestination /opt/oracle/oradata/opitstop -storageType CFS -nodelist RAC_NODE_1,RAC_NODE_2 -characterSet WE8IS08859P15 -listeners opitstop -memoryPercentage 30 -continueOnNonFatalErrors true

Place above command in a .sh file (shell script) say and just run it. Before running the script make sure the cluster services (crs) are running and also you have user equivelance between the rac nodes for the oracle owner ie., eg. if the oracle owner username is oraracdb in RAC_NODE_1 and RAC_NODE_2 then when you do a ssh from RAC_NODE_1 to RAC_NODE_2 it should go without asking for the password.

There are more options available with dbca. Some of them are -createDatabase, -createTemplateFromDB, -createCloneTemplate, -generateScripts, -deleteDatabase, -configureASM, -deleteInstance. For a complete list of the usage execute dbca -help.

DBCA Log Location: $ORACLE_HOME/cfgtoollogs/dbca/[SID]

Happy DB creation(s) !!!


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srvctl command line options

Posted on May 22, 2008. Filed under: RAC | Tags: , , |

Thought this might be helpful.

Usage: srvctl [-V]
Usage: srvctl add database -d -o [-m ] [-p ] [-A /netmask] [-r {PRIMARY | PHYSICAL_STANDBY | LOGICAL_STANDBY}] [-s ] [-n ] [-y {AUTOMATIC | MANUAL}]
Usage: srvctl add instance -d -i -n
Usage: srvctl add service -d -s -r “” [-a “”] [-P ]
Usage: srvctl add service -d -s -u {-r “” | -a “”}
Usage: srvctl add nodeapps -n -o -A /netmask[/if1[|if2|…]]
Usage: srvctl add asm -n -i -o [-p ]
Usage: srvctl config database
Usage: srvctl config database -d [-a] [-t]
Usage: srvctl config service -d [-s ] [-a] [-S ]
Usage: srvctl config nodeapps -n [-a] [-g] [-o] [-s] [-l]
Usage: srvctl config asm -n
Usage: srvctl config listener -n
Usage: srvctl disable database -d
Usage: srvctl disable instance -d -i “”
Usage: srvctl disable service -d -s “” [-i ]
Usage: srvctl disable asm -n [-i ]
Usage: srvctl enable database -d
Usage: srvctl enable instance -d -i “”
Usage: srvctl enable service -d -s “” [-i ]
Usage: srvctl enable asm -n [-i ]
Usage: srvctl getenv database -d [-t “”]
Usage: srvctl getenv instance -d -i [-t “”]
Usage: srvctl getenv service -d -s [-t “”]
Usage: srvctl getenv nodeapps -n [-t “”]
Usage: srvctl modify database -d [-n <db_name] [-o ] [-m ] [-p ] [-r {PRIMARY | PHYSICAL_STANDBY | LOGICAL_STANDBY}] [-s ] [-y {AUTOMATIC | MANUAL}]
Usage: srvctl modify instance -d -i -n
Usage: srvctl modify instance -d -i {-s | -r}
Usage: srvctl modify service -d -s -i -t [-f]
Usage: srvctl modify service -d -s -i -r [-f]
Usage: srvctl modify service -d -s -n -i [-a ] [-f]
Usage: srvctl modify asm -n -i [-o ] [-p ]
Usage: srvctl relocate service -d -s -i -t [-f]
Usage: srvctl remove database -d [-f]
Usage: srvctl remove instance -d -i [-f]
Usage: srvctl remove service -d -s [-i ] [-f]
Usage: srvctl remove nodeapps -n “” [-f]
Usage: srvctl remove asm -n [-i ] [-f]
Usage: srvctl setenv database -d {-t =[,=,…] | -T =}
Usage: srvctl setenv instance -d [-i ] {-t “=[,=,…]” | -T “=”}
Usage: srvctl setenv service -d [-s ] {-t “=[,=,…]” | -T “=”}
Usage: srvctl setenv nodeapps -n {-t “=[,=,…]” | -T “=”}
Usage: srvctl start database -d [-o ] [-c | -q]
Usage: srvctl start instance -d -i “” [-o ] [-c | -q]
Usage: srvctl start service -d [-s “” [-i ]] [-o ] [-c | -q]
Usage: srvctl start nodeapps -n
Usage: srvctl start asm -n [-i ] [-o ] [-c | -q]
Usage: srvctl start listener -n [-l ]
Usage: srvctl status database -d [-f] [-v] [-S ]
Usage: srvctl status instance -d -i “” [-f] [-v] [-S ]
Usage: srvctl status service -d [-s “”] [-f] [-v] [-S ]
Usage: srvctl status nodeapps -n
Usage: srvctl status asm -n
Usage: srvctl stop database -d [-o ] [-c | -q]
Usage: srvctl stop instance -d -i “” [-o ] [-c | -q]
Usage: srvctl stop service -d [-s “” [-i ]] [-c | -q] [-f]
Usage: srvctl stop nodeapps -n
Usage: srvctl stop asm -n [-i ] [-o ] [-c | -q]
Usage: srvctl stop listener -n [-l ]
Usage: srvctl unsetenv database -d -t “”
Usage: srvctl unsetenv instance -d [-i ] -t “”
Usage: srvctl unsetenv service -d [-s ] -t “”
Usage: srvctl unsetenv nodeapps -n -t “”


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CLUVFY utility will fail if ssh banner is enabled

Posted on April 30, 2008. Filed under: RAC | Tags: , , , , , |

The cluster verification utility will fail in User Equivalence check between RAC nodes, if ssh banner is enabled on the boxes. According to Oracle (Note ID: 4692561.8 – Bug ID: 4692561) this issue is fixed in and

Whereas in our case, we did download the latest cluvfy utility (11g) but we still faced this issue.

11g cluvfy utility can be run against 10g databases, by adding the option -r 10gR1 or 10gR2.

Sample cluster pre-install verification command stage -pre crsinst -n node1,node2 -r 10gR2 -verbose
— No space between node1, and node2 (node1,node2 holds good – node1, node2 doesnt)

Before running make sure you had set CV_HOME and CV_JDKHOME.


Disable the ssh login banner and re-run the cluvfy utility.


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How to send email from 10g Oracle Database (UTL_MAIL)

Posted on April 24, 2008. Filed under: Configuration | Tags: , , , , , |

Heres a simple solution to send out emails from 10g Database sql prompt.

This solution will be really helpful if the OS utility (mailx, sendmail) is restricted for end users.

Steps to enable Mailing from Database

1. sqlplus ‘/ as sysdba’
2. @$ORACLE_HOME/rdbms/admin/utlmail.sql
3. @$ORACLE_HOME/rdbms/admin/prvtmail.plb
4. Set smtp_server information in init.ora or spfile.ora
alter system set smtp_out_server = ‘SMTP_SERVER_IP_ADDRESS:SMTP_PORT’ scope=both;
25 = Default SMTP Port

If instance had been started with spfile

eg: alter system set smtp_out_server = ‘’ scope=both;

If instance had been started with pfile
alter system set smtp_out_server = ‘’;
Also make below entry in your initSID.ora

smtp_out_server = ‘’

Thats It, your database is configured to send emails ….

How to send an email

1. sqlplus ‘/ as sysdba’
2. exec utl_mail.send((sender => ‘’, recipients => ‘’, subject => ‘Testing UTL_MAIL Option’, message => ‘blah blah blah’);
3. Check the inbox of the email id, to verify the email receipt.

To enable other DB users to use this functionality, grant execute permission on UTL_MAIL package.

eg: grant execute on utl_mail to apps;

Happy Mailing !!!


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