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Original Survey on Event Processing Languages

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Old 11-19-2007
Original Survey on Event Processing Languages

Tim Bass
Mon, 19 Nov 2007 09:59:49 +0000
A few of us have been discussing*event processing languages (EPLs)*for a number of years, advocating*that SQL-like languages are appropriate for certain classes of CEP/EP problems, but not all.
Some*readers might recall that I published a draft survey on EPLs*to the Yahoo! CEP*Interest*group titled, (DRAFT) A Survey of Event Processing Languages (EPLs), October 15, 2006 (version 14).
A number of us CEP “grey beards” have consistently advocated that there are EPLs and analytics that are optimal for certain classes of event processing problems (and, in turn, there also are EPLs that are suboptimal for certain classes of event processing problems).
For readers who do not frequent the Yahoo! CEP group,*below here is*a link to a*copy of the original survey.


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Test Your Knowledge in Computers #774
Difficulty: Medium
The finite state machine has more computational power than a Turing machine.
True or False?
DROPLANG(1)						  PostgreSQL Client Applications					       DROPLANG(1)

droplang - remove a PostgreSQL procedural language SYNOPSIS
droplang [ connection-options... ] langname [ dbname ] droplang [ connection-options... ] --list | -l dbname DESCRIPTION
droplang is a utility for removing an existing programming language from a PostgreSQL database. droplang can drop any procedural language, even those not supplied by the PostgreSQL distribution. Although backend programming languages can be removed directly using several SQL commands, it is recommended to use droplang because it performs a number of checks and is much easier to use. See DROP LANGUAGE [drop_language(7)] for more. OPTIONS
droplang accepts the following command line arguments: langname Specifies the name of the backend programming language to be removed. [-d] dbname [--dbname] dbname Specifies from which database the language should be removed. The default is to use the database with the same name as the current system user. -e --echo Displays SQL commands as they are executed. -l --list Shows a list of already installed languages in the target database (which must be specified). droplang also accepts the following command line arguments for connection parameters: -h host --host host Specifies the host name of the machine on which the server is running. If host begins with a slash, it is used as the directory for the Unix domain socket. -p port --port port Specifies the Internet TCP/IP port or local Unix domain socket file extension on which the server is listening for connections. -U username --username username User name to connect as -W --password Force password prompt. ENVIRONMENT
Most error messages are self-explanatory. If not, run droplang with the --echo option and see under the respective SQL command for details. Check also under psql(1) for more possibilities. NOTES
Use createlang(1) to add a language. EXAMPLES
To remove pltcl: $ droplang pltcl dbname SEE ALSO
createlang(1), DROP LANGUAGE [drop_language(7)] Application 2002-11-22 DROPLANG(1)

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