Hdparm can be used to view or set many hardware characteristics of IDE or SATA drives including optical drives (and even some SCSI drives). For example, the read-lookahead feature can be enabled or disabled. Also of interest is that the on board write caching can be disabled. This may or may not be of use when trying to optimize the writing of data to the drive especially when the operating system and/or file system itself may also perform write caching.
Some options of hdparm are dangerous and are generally listed as such in the man page.
Hdparm is available from SourceForge and there is even a version for Windows.
Some options of hdparm are dangerous and are generally listed as such in the man page.
Hdparm is available from SourceForge and there is even a version for Windows.
Recital provides the following additional benefits:
- Easy to Install and Deploy - Users can set up Recital in minutes enabling organizations to deliver new applications faster than other databases.
- Easy to Administer - Recital is a low administration database that eliminates the need for highly trained, skilled, and costly database administrators to maintain the database.
- High Performance - Superior database performance for the most demanding of OLTP applications. Additionally, Clustered Recital provides 99.999% availability.
- Embeddable Library - Recital Embedded Edition provides in-process data storage engine that delivers all the features of a traditional relational database but in a size which makes it ideally suited for ISVs/VARs who need a small footprint and easy to use toolkit.
- Platform Independence - Recital runs on Linux, Solaris, AIX, HP-UX, Windows, and Mac OS X giving organizations complete flexibility in delivering a solution on the platform of their choice.
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:
Specifying this seems to reslove the problem:
-Xmx512m -XX:MaxPermSize=512m
MQCURMSGS()
Syntax
MQCURMSGS( <expN> )Description
The MQCURMSGS() function returns the current number of unread messages in the queue specified by <expN>Example
mqdes=mqopen("/myqueue")
if (mqdes < 0)
messagebox(strerror()+",errno="+alltrim(str(error())))
return
endif
do while (mqcurmsgs(mqdes) > 0)
mstr=mqreceive(mqdes)
if (empty(mstr))
messagebox(strerror()+",errno="+alltrim(str(error())))
return
endif
messagebox(mstr)
end do
mqclose(mqdes)
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
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
All temporary files created by Recital are stored in the directory specified by the environment variable DB_TMPDIR.
In order to have these files stored in memory first create a temporary directory
mkdir /opt/recital/tmp
Then mount the directory with the tmpfs command
mount -t tmpfs -o size=1g recitaltmpfs /usr/recital/tmp
Then change the DB_TMPDIR variable in the recital.conf to point to the newly created temporary directory.
An extremely useful article that describes some firefox undocumented features that allow you to install Firefox XPI And JAR Firefox Add-ons And Themes.
http://www.universefirefox.com/how-to/how-to-install-xpi-and-jar-firefox-add-ons-and-themes
When using Recital Web you can maintain the exact state of each work area between pages like this.
On exit of an .rsp page.
On entry to an .rsp page.
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
In Linux you can run lsof and pipe it though grep for the files you are interested in, for example;
$ lsof | grep db.exe | grep accounts db.exe 16897 john 6uw REG 253,0 20012 3413872 /usr/recital100/qa/accounts.dbf db.exe 16897 john 7u REG 253,0 4176 3413885 /usr/recital100/qa/accounts.dbxIf you want to check for locks you can use lslk, for example;
$ lslk | grep db.exe | grep accounts db.exe 16897 253,0 3413872 20012 w 0 0 0 12319 0 /usr/recital100/qa/accounts.dbfIf you don't have lslk installed you can install it with one of the updaters, for example on redhat linux:
$ yum update lslk