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If you want details about how storage devices are performing on Redhat/Centos/Fedora use the vmstat and iostat commands.

After installing Centos 5.3 the iostat command is not available. To install it use yum:

# yum install sysstat
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When debugging C code it is common to write debugging to an external text file using the __FILE__ and __LINE__ preprocessor defines to trace execution flow.

Unfortunately java does not support __FILE__ and __LINE__ but you can get the same functionality with this code which can be placed in one of your libraries.
	
public static void showTrace(String msg)
{
	if (msg.length() > 0) System.out.println(msg);
	System.out.println("Trace: " + 
				   "file " + new Throwable().getStackTrace()[1].getFileName() +
				   " class " + new Throwable().getStackTrace()[1].getClassName() +
				   " method " + new Throwable().getStackTrace()[1].getMethodName() +
				   " line " + new Throwable().getStackTrace()[1].getLineNumber());
}
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Recital 10 enhances the APPEND FROM command. The enhancement was added to the following syntax ;
APPEND FROM  <table-name> 
Before when appending into a shared Recital table each new row was locked along with the table header, then unlocked after it was inserted. This operation has now been enhanced to lock the table once, complete inserting all the rows from the table and then unlock the table. The performance of this operation has been increased by using this method. All the database and table constraints are still enforced.
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If you use Eclipse Ganymede with large projects on linux you may run out of memory. To prevent this happening, you can specify the amount of memory to be allocated to Eclipse in the eclipse.ini file which is located in the eclipse directory.

Specifying this seems to reslove the problem:

-Xmx512m
-XX:MaxPermSize=512m

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TIP
The Recital Oracle Gateway requires the Oracle libclntsh.so shared library.  If this file is unknown to ld.so.conf, add it using the ldconfig command. 
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Another useful article on IBM developerworks shows how to build PHP extensions using SWIG. You can find the article here.
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If you have a live linux site that is running vmware virtual machines, you can pause the virtual machines when you want to perform a backup, I use acronis for linux which does incremental backups and you can specify a command to run before and after the backup, this allows backups to be performed at scheduled times daily without any intervention. In my examples below, the virtual machine i want to control is in /root/vmware/Recital/Recital.vmx

To pause the virtual machine on linux:

# vmrun pause /root/vmware/Recital/Recital.vmx


and then to unpause after the backup has completed:

# vmrun unpause /root/vmware/Recital/Recital.vmx


That is basicallty it, no need to attend the backup and it can be perfomed at a suitable time so no users are affected.

Incidentally, vmrun lets you startup a virtual machine at system startup too, without needing the GUI:

# vmrun start /root/vmware/Recital/Recital.vmx


Or alternatively stop it:

# vmrun stop /root/vmware/Recital/Recital.vmx


There are lots of other capabilities of this command, running applications inside the virtual machine etc etc. For full details just type vmrun in a terminal window.



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By default Recital uses PAM to authenticate users.  It is also possible to tell PAM to use Kerberos.  Simply replace the existing entries in the /etc/pam.d/recital file with the ones below:

auth       sufficient   pam_krb5.so try_first_pass
auth       sufficient   pam_unix.so shadow nullok try_first_pass
account    required     pam_unix.so broken_shadow
account    [default=bad success=ok user_unknown=ignore] pam_krb5.so
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Recital 10 enhances the APPEND FROM command. The enhancement added the following syntax ;
APPEND FROM  TYPE CSV <file-name.csv> 
The TYPE keyword has now been enhanced to support a comma separated values (CSV) format
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