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How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...to keep track of which pages they are on and their last access date to the site. I then have a cron that runs every 15 minutes to DELETE old records.
...
What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?
...ry and are well suited for content oriented applications (which is why big sites like Facebook or Amazon like them).
Other kinds of NoSQL databases include column-oriented stores, graph databases and even object databases. But this goes beyond the question.
See also
Comparing Document Databases ...
postgres default timezone
...CT * FROM pg_timezone_names which is probably safer to do, given 3rd-party sites won't necessarily be as up-to-date (or out-of-date) as your own particular database instance.
– SeldomNeedy
May 28 '15 at 21:36
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What are unit tests, integration tests, smoke tests, and regression tests?
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Can the site be pinged at all - suitably enough, a service called Binary Canary exists.
– Dan Dascalescu
Feb 23 '14 at 23:53
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What is a PDB file?
...ou should be doing is create the pdb files but don't ship them to customer site in product installer. Preserve all the generated PDB files on to a symbol server from where it can be used/referenced in future if required. Specially for cases when you debug issues like process crash. When you start an...
What is the 'instanceof' operator used for in Java?
...
As described on this site:
The instanceof operator can be used to test if an object is of a
specific type...
if (objectReference instanceof type)
A quick example:
String s = "Hello World!"
return s instanceof String;
//result -->...
Difference between binary semaphore and mutex
... between the two.We are using posix standard only .So the major difference sited between mutex and binary semaphore seems vague.
– achoora
Feb 18 '16 at 8:37
1
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convert_tz returns null
...nning the command in the accepted answer (which is the same on MySQL's dev site) the command was unable to convert between timezones such as
SELECT CONVERT_TZ('2004-01-01 12:00:00','UTC','MET') AS time
It turns out that on OS X there are two files that cause problems: /usr/share/zoneinfo/Factory ...
Exposing database IDs - security risk?
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It depends on what the IDs stand for.
Consider a site that for competitive reason don't want to make public how many members they have but by using sequential IDs reveals it anyway in the URL: http://some.domain.name/user?id=3933
On the other hand, if they used the login n...
Best way to implement request throttling in ASP.NET MVC?
...on against denial of service and brute force attacks on web server and web sites. Such protection is provided by temporarily blocking IP addresses of the HTTP clients who make unusually high number of concurrent requests or who make large number of requests over small period of time."
http://learn...