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Please explain the exec() function and its family
...s was used quite a lot (and still is) for daemons which simply listen on a TCP port and fork a copy of themselves to process a specific request while the parent goes back to listening. For this situation, the program contains both the parent and the child code.
Similarly, programs that know they're ...
Prevent direct access to a php include file
...e.Hunter: this is about blocking access to viewing your include/library script files directly, the answer works. If they created somefile.php on your server and added your define in it, that still doesn't let them directly access the include file. It will let them "include" your library files, but i...
Loading cross-domain endpoint with AJAX
... I can't get a response. However using jsonp the browser is expecting a script mime type but is receiving "text/html".
9 An...
How to create a new database after initally installing oracle database 11g Express Edition?
...ho diagnostic_dest=%db_dir%>>%init_file%
echo dispatchers='(protocol=tcp) (service=%app_name%xdb)'>>%init_file%
echo shared_servers=4>>%init_file%
echo open_cursors=300>>%init_file%
echo remote_login_passwordfile='exclusive'>>%init_file%
echo undo_management=auto>>...
Is async HttpClient from .Net 4.5 a bad choice for intensive load applications?
...
I have found exactly the same issue creating TCP port exhaustion on the client. The solution was to lease the HttpClient instance for long periods of time where iterative calls were being made, not create and dispose for each call. The conclusion I reached was "Just bec...
How to make Java honor the DNS Caching Timeout?
...d domain name. Through some DNS magic, the domain name is resolved into an IP that's closest to the server with least load. For the load-balancing to work, the application server needs to honor the TTL from DNS response and to resolve the domain name again when cache times out. However, I couldn't f...
How unique is UUID?
...ead.
Source: The Random UUID probability of duplicates section of the Wikipedia article on Universally unique identifiers (link leads to a revision from December 2016 before editing reworked the section).
Also see the current section on the same subject on the same Universally unique identifier a...
How to design a multi-user ajax web application to be concurrently safe
...led with lower memory consumption. I think a node.js server and relying on TCP WebSockets really helps with scaling. It completely ruins cross browser compliance though.
– Raynos
Feb 17 '11 at 17:19
...
HashMap get/put complexity
...could have a hash which takes a long time to compute, and if there are multiple items in the hash map which return the same hash code, get will have to iterate over them calling equals on each of them to find a match.
In the worst case, a HashMap has an O(n) lookup due to walking through all entrie...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...tion SID. Both SID are different.
So ORACLE session is nothing but a jdbc(tcp) connection; which is nothing but one SID.
If we set maximum cursors as 500 then it is only for one JDBC session/connection/SID.
So we can have many JDBC connection with its respective no of cursors (statements).
Once t...