Sometimes you need to see the difference between two pieces of console output. When I research, this can be two stacktraces, but also /proc//maps and smaps output; really anything. Of course, there’s diff, but the diff output is not very visual. Also, diff doesn’t do diffing between more than two files.
This can be done reasonably simple in vim. Here’s how to do that:
1. start vi; vi
2. do a vertical split using a (more...)
I’m working on Oracle database migration project where customer have chosen commodity x86 hardware with RHEL6 and EMC storage.
I’ve done many similar installations in the past and I always used the native MPIO in Linux (DM-Multipath) to load balance and failover I/O paths. This time however I’ve got EMC PowerPath doing the load balance and failover and got the native MPIO disabled. From my point of view it’s the same, whether I’ll be using (more...)
Just a short post on a problem I encountered recently.
I had to install 11.2 GI and right after running the installer I got a message saying permission denied. Below is the exact error:
[oracle@testdb grid]$ ./runInstaller -silent -showProgress -waitforcompletion -responseFile /u01/software/grid/response/grid_install_20140114.rsp
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 120 MB. Actual 7507 MB Passed
Checking swap space: must be greater than 150 MB. Actual 8191 MB (more...)
Before storage device can be removed (or unassigned) from server, it must first be removed from Linux. This is even more necessary if the server is running Oracle ASMLib, because if there are any removed or read-only storage devices present when running service oracleasm scandisks, the command will just hang and server load will start to increase (maximum I've seen was 3500).
Here you find RedHat instructions on how to cleanly remove storage devices (more...)
Ubuntu is a very popular operating system (OS) in the cloud space but the Federal government has been reluctant to adopt Ubuntu, preferring to stick with Redhat as their Linux flavor of choice. As the Government moves toward the cloud it makes sense to me that Ubuntu would start to see some more play time. One of the big hurdles to this is the need to ensure that Ubuntu meets the Federal Information Security Management Act (more...)
Every DBA working with the Oracle database must have seen memory dumps in tracefiles. It is present in ORA-600 (internal error) ORA-7445 (operating system error), system state dumps, process state dumps and a lot of other dumps.
This is how it looks likes:
Dump of memory from 0x00007F06BF9A9E00 to 0x00007F06BF9ADE00
7F06BF9A9E00 0000C215 0000001F 00000CC1 0401FFFF [................]
7F06BF9A9E10 000032F3 00010003 00000002 442B0000 [.2............+D]
7F06BF9A9E20 2F415441 31323156 4F2F3230 4E494C4E [ATA/V12102/ONLIN]
7F06BF9A9E30 474F4C45 6F72672F 315F7075 (more...)
This is the 4th post in a series of posts on PGA behaviour of Oracle. Earlier posts are: here (PGA limiting for Oracle 12), here (PGA limiting for Oracle 11.2) and the quiz on using PGA with AMM, into which this blogpost dives deeper.
As laid out in the quiz blogpost, I have a database with the following specifics:
-Oracle Linux x86_64 6u6.
-Oracle database 220.127.116.11 PSU 4
I’ve posted a new installation cookbook for using Oracle within a virtual machine running on Oracle VM. Surprisingly, I was unable to come up with a satisfactory method of accessing external storage that did not involve the use of Oracle ASMLib…
Oracle Linux 6 Update 5 within an Oracle VM Template
Filed under: Blog
, oracle vm
This is a series of blogposts on how the Oracle database makes use of PGA. Earlier posts can be found here (PGA limiting for Oracle 12) and here (PGA limiting for Oracle 11.2).
Today a little wednesday fun: a quiz.
What do you think will happen in the following situation:
-Oracle Linux x86_64 6u6.
-Oracle database 18.104.22.168 PSU 4
-Oracle database (single instance) with the following parameter set: memory_target=1G. No other (more...)
This is the second part of a series of blogpost on Oracle database PGA usage. See the first part here. The first part described SGA and PGA usage, their distinction (SGA being static, PGA being variable), the problem (no limitation for PGA allocations outside of sort, hash and bitmap memory), a resolution for Oracle 12 (PGA_AGGREGATE_LIMIT), and some specifics about that (it doesn’t look like a very hard limit).
But this leaves out Oracle version (more...)
This post is about memory management on the operating system level of an Oracle database. The first question that might pop in your head is: isn’t this a solved problem? The answer is: yes, if you use Oracle’s AMM (Automatic Memory Management) feature, which let’s you set a limit for the Oracle datababase’s two main memory area’s: SGA and PGA. But in my opinion any serious, real life, usage of an Oracle database on Linux (more...)
There has recently been a lot of news about the exploit revealed in the bash shell. While the fix is very quick to implement, there are a couple of tricks that are required to install this update on an Exadata environment. According to Oracle support note #1405320.1, Exadata storage server versions 11.2.3.x.x and 12.1.1.x.x are susceptible to the exploit. On a typical Oracle Enterprise Linux, a simple (more...)
Not Often, I checked about my space after made filesystem on Linux. Today, I have made Ext4 filesystem around 460GB, I found it 437GB only. Some path should be 50GB, but it was available only 47GB.
Thank You @OracleAlchemist
for good information about it.
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup0-U01LV 50G 52M 47G 1% /u01
Reference - (more...)
It was a quiet day, I worked as System Administrator and installed Oracle Linux on Virtual Machine guest. After installed Operating System, I wanted to extend disk on guest. So, I extended disk on guest. Anyway, I came back in my head what I was supposed to do on Linux then ?
- Create new disk (and Physical Volume) and then add in Volume Group.
Checked my partition:
My time has used much with Linux. Some people asked to move from CentOS to Oracle Linux somehow. I used to believe it easy to do like that. Anyway, It'd better to test.
I focused on 2 links.https://linux.oracle.com/switch/centos/http://docs.oracle.com/cd/E37670_01/E37355/html/ol_switch_yum.html
Oracle introduces centos2ol.sh script that can convert CentOS 5 and 6 systems to Oracle Linux. After that run "yum upgrade"
[root@test-centos ~]# uname -r
Most of the talk about Oracle’s release of 22.214.171.124 is about the InMemory feature, but more things have changed, for example some essential things about loggin in the Grid Infrastructure have changed. Normally in Oracle Grid Infrastructure logging for Grid components was done in $GI_HOME:
oracle@dm01db01(*gridinfra):/home/oracle> cd $ORACLE_HOME/log/`hostname -s`/
There we have the main alert log for GI and several subdirectories for the GI binaries where they write (more...)
I’m sharing this in the hope of saving someone from an unwelcome surprise.
I recent upgraded an Exadata system from 126.96.36.199.1 to 188.8.131.52.1. Apart from what turns out to be a known bug that resulted in the patching of the InfiniBand switches “failing”, it all seemed to go without a snag. That’s until I decided to do some node failure testing…
Having forced a node (more...)
The following is a list of changes I noted during installation of Oracle Linux 7. I imagine the same will apply to Red Hat Enterprise Linux 7, but I haven’t verified that to be the case.
Setting the Hostname
I was accustomed to updating /etc/sysconfig/network with the hostname of my machine as documented here for Oracle Linux 7. I did this and was then surprised to find that my hostname was not picked up. On returning (more...)
Some time ago a vmware server did not recognize any more a data disk. This disk was formatted with vmfs v3
(enter the vmware server via ssh and type mount..). First thing i did, was creating an image of this disk, to play around without any danger of data loss.
There is a good article how to mount vmfs
, but on debian i had to install the package otherosfs.
After i installed this (more...)
There was an interesting question in Oracle-L about the JOXSHM_EXT_* files in /dev/shm directory on Linux. Basically something like this:
$ ls -l /dev/shm/* | head
-rwxrwx--- 1 oracle dba 4096 Apr 18 10:16 /dev/shm/JOXSHM_EXT_0_LIN112_1409029
-rwxrwx--- 1 oracle dba 4096 Apr 18 10:16 /dev/shm/JOXSHM_EXT_100_LIN112_1409029
-rwxrwx--- 1 oracle dba 4096 Apr 18 10:16 /dev/shm/JOXSHM_EXT_101_LIN112_1409029
-rwxrwx--- 1 oracle dba 4096 Apr 18 10:23 /dev/shm/JOXSHM_EXT_102_LIN112_1409029
-rwxrwx--- 1 oracle dba 4096 Apr 18 10:23 /dev/shm/JOXSHM_EXT_103_LIN112_1409029
-rwxrwx--- 1 (more...)