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'
A quick tip for optimizing TCP performance on linux.
edit /etc/sysctl.conf add the lines:
If using gigabit ethernet:
net.ipv4.tcp_mem= 98304 131072 196608
net.ipv4.tcp_window_scaling=1
net.core.wmem_default = 65536
net.core.rmem_default = 65536
net.core.wmem_max=8388608
To reload these use:
# sysctl -p
If using infiniband:
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_sack=0
net.ipv4.tcp_rmem=10000000 10000000 10000000
net.ipv4.tcp_wmem=10000000 10000000 10000000
net.ipv4.tcp_mem=10000000 10000000 10000000
net.core.rmem_max=524287
net.core.wmem_max=524287
net.core.rmem_default=524287
net.core.wmem_default=524287
net.core.optmem_max=524287
net.core.netdev_max_backlog=300000
Another useful article on IBM developerworks shows how to build PHP extensions using SWIG. You can find the article here.
When using Recital on linux you can integrate your favorite linux shell commands and use then directly inside Recital using the alias command. This can be particularly useful when you ssh into a remote system and run recital. You can then issue linux commands without having to open another terminal session. Several aliased shell commands are predefined in /opt/recital/conf/config.db. You can add others to suit your needs.
On my system i have these commands aliased.
The alias command handles parameter substitition.
alias pwd "? default()"
alias cp "copy file "
alias mv "rename "
alias rm "erase "
alias ls "run('ls $0')"
alias ps "run('ps $0')"
alias grep "run('grep $0')"
alias cd "set default to $1"
alias cls "clear screen"
These commands can now be used inside the Recital command window just as you would use them at the linux prompt, including the ability to pipe commands together.
ls -l | grep .prg ps -elf | grep db.exeThe run() function that is used to run the shell command as specified in the alias command will capture output and display it in a text viewer. If you want to run the command and display the contents full screen, then specify true as the third parameter to the run().
run("command", true, true)
The arguments to run() are as follows.
| Argument | Description |
|---|---|
| 1 | the command line to run |
| 2 | True if output should be displayed in a text area (default True) |
| 3 | True if the output should be displayed full screen (default False) |
| Macro | Description |
|---|---|
| $0 | the command line following the command name |
| $1..$n | the arguments given to the command |
Add this directive to your /etc/httpd/httpd.conf file and restart apache.
DirectoryIndex default.rsp index.html
There's a nice article on IBM developerworks describing how to package software using RPM. You can read it here.
TIP
To access the menu bar in Recital, press the / key.
To access the menu bar in Recital, press the / key.
Full details on Recital Function Keys can be found in the Key Assist section of the Help menu, or in our documentation wiki here.
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TIP
The Compatibility Dialog settings are written to the compat.db file in <path>/conf - please ensure that the user setting the compatibility settings has write access to this file and directory. Once these settings are written, the dialog will not be displayed unless SET COMPATIBLE is issued.
The Compatibility Dialog settings are written to the compat.db file in <path>/conf - please ensure that the user setting the compatibility settings has write access to this file and directory. Once these settings are written, the dialog will not be displayed unless SET COMPATIBLE is issued.
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We are pleased to announce the immediate availability of Recital 10.0.1.
Included in this version are:
- Improved SQL query optimizer
- *New* apache plugin for building Recital web apps on x86_64 (mod_recital64.so)
- Performance improvements in connections to Recital Server and Recital Web.
- Recital ODBC driver performance improvements and bug fixes
- Miscellaneous bug fixes
The download is available from http://www.recitalsoftware.com in the downloads section of our website.
Existing Recital 10 users can download the patch file and apply it to an existing installation.
Enjoy!
Existing Recital 10 users can download the patch file and apply it to an existing installation.
Enjoy!
In an interesting article at Linux Magazine, Sam Ockman discusses the origin of the term "Open Source". Check it out here.