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In Recital 10, you can declare anonymous classes and call anonymous methods in these classes.
// declare some simple procedures 
proc display(cArg)
    echo "display=" + cArg
endproc

proc show(cArg)
    echo "show=" + cArg
endproc

// create an object based on an anonymous class
myobj = new object()

// add some properties
myobj["name"] = "barry"
myobj["company"] = "recital"

// now declare an anonymous method
myobj["mymethod"] = display

// call the method
myobj.mymethod("hello world")    // displays "display=hello world"

// redeclare the method
myobj["mymethod"] = show

// call the method
myobj.mymethod("hello world")    // displays "show=hello world"
Where this becomes particularly useful is when you have a procedure that calls anonymous methods in order to process data. This technique can be used to call anonymous procedures in your code.
proc processdata(oArg)
    oArg.mymethod(oArg.name)    
endproc

proc show(cArg)
    echo "show=" + cArg
endproc

myobj = new object()
myobj["name"] = "barry"
myobj["mymethod"] = show
processdata(myobj)        // displays "show=barry"
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If you have 4 GB or more RAM use the Linux kernel compiled for PAE capable machines. Your machine may not show up total 4GB ram. All you have to do is install PAE kernel package.

This package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE).

The non-PAE kernel can only address up to 4GB of memory. Install the kernel-PAE package if your machine has more than 4GB of memory (>=4GB).

# yum install kernel-PAE

If you want to know how much memory centos is using type this in a terminal:

# cat /proc/meminfo
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Found a nice subversion plugin for finder on the MAC.

The goal of the SCPlugin project is to integrate Subversion into the Mac OS X Finder. 

  • Support for Subversion.
  • Access to commonly used source control operations via contextual menu [screenshot]
  • Dynamic icon badging for files under version control. Shows the status of your files visually. [ screenshot ]
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  • For building shared libraries on the MAC the following need to be set
    1. The shared library file extension should be .dylib
    2. The compile flag is -dynamic
  • For accessing the shared libraries at runtime
    1. DYLD_LIBRARY_PATH needs to be set to the location of the shared libraries
  • Useful utilities for shared library support
    1. The following command will display the table of contents of the dynamically linked library
		otool -TV sharedlibraryfile.dylib
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Recital 10 enhances the SQL optimizer. Now, production indexes with a FOR <conditions> will be used to optimize SQL SELECT statements. If a WHERE <condition> on a SELECT statement matches a FOR <condition> on an index tag, this index will be used to optimize the query. The WHERE <condition> must be an exact match with the  FOR <condition>.  For example;
USE accounts 
INDEX on account_no TAG outstanding FOR balance  > 0
EXPLAIN SELECT * FROM accounts WHERE balance  > 0
  Optimized using for condition on tag 'OUTSTANDING'
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When using Recital Web you can maintain the exact state of each work area between pages like this.

On exit of an .rsp page.

SAVE DATASESSION TO m_state 
_SESSION["state"] = m_state

On entry to an .rsp page.

IF type( _session["state"] ) != "U" 
    m_state = _session["state"]
    RESTORE DATASESSION FROM m_state
ENDIF
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Use iptables to restrict access to Recital Web only from localhost.

iptables -I INPUT -j ACCEPT -p tcp --destination-port 8001 -i lo
iptables -A INPUT -j DROP -p tcp --destination-port 8001 -i eth0


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A really nice plugin for eclipse that lets you write/edit  Trac wiki pages in eclipse.

http://trac-hacks.org/wiki/EclipseTracPlugin
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A number of people have complained about data loss after a system crash when using Ext4.  A bug report was logged. According to multiple posts by a developer of Ext4, Theodore Tso, this is due to differences in approach to security and performance issues between the two file systems.

Ext3 commits writes to disk within approximately 5 seconds - Ext4 can take from 40-150 seconds.  In addition, if a system is using Ext3 and crashes before the commit takes place you will still have the previous contents of a file where under Ext4 the file will be empty.  Theodore Tso feels that this is a failure at the application level and that the file system is behaving as designed and as specified by the POSIX spec (which apparently does not specify what is supposed to happen when a system is not shut down cleanly).  His solution to the issue is to suggest proper use of fsync() and lists various scenarios/examples in post 54 of the bug report (linked above).  In addition he wrote a patch that recognize the rename() situation mentioned in his post 54 yet retains the normal Ext4 behaviors and performance in the majority of cases.  Also a more "proper" solution has been provided which allows the behavior of Ext3 to be retained under Ext4 by mounting it with alloc_on_commit.

A somewhat related topic is the use of on-board caching by hard drives.  This behavior can be modified on most drives by using hdparm.
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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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