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postgresql COUNT(DISTINCT …) very slow
... amount of work_mem (where hashing will produce relatevely large amount of batches). Since that, it's not always bad to use COUNT (DISTINCT()_, isn't?
– St.Antario
Oct 12 '15 at 10:39
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Why does InetAddress.isReachable return false, when I can ping the IP address?
...e it.
So, if you run InetAddress.getByName("www.google.com").isReacheable(5000) as root, it should return true.
you need proper authorizations for the raw socket, which is used by ICMP (the protocol used by ping)
InetAddress.getByName is as reliable as ping, but you need proper permissions on the...
sql server #region
...ain Transact-SQL statements should not be grouped together within the same batch (statement block). Could anyone tell me why they should not be grouped?
– Jacob Phan
May 4 '16 at 4:26
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What's the difference between libev and libevent?
...e designed for async i/o scheduling, and both engages epoll on linux, and kqueue on FreeBSD, etc.
2 Answers
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How to restart Jenkins manually?
...Restart - Allows all running jobs to complete. New jobs will remain in the queue to run after the restart is complete.
(jenkins_url)/restart - Forces a restart without waiting for builds to complete.
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How to detect a Christmas Tree? [closed]
...ightthr=0.95, satthr=0.7,
valthr=0.7, monothr=220, maxpoints=5000, proxthresh=0.04):
# Convert rgb image to monochrome for
gryimg = np.asarray(Image.fromarray(rgbimg).convert('L'))
# Convert rgb image (uint, 0-255) to hsv (float, 0.0-1.0)
hsvimg = colors.rgb_to_hsv(rgb...
Get a list of URLs from a site [closed]
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But there is a limit of 5000 links!..:( I'm looking for any free php sitemap generator script.
– Jenson M John
Aug 3 '13 at 10:25
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How to force garbage collector to run?
...etter performance": it simply blocks until all objects in the finalisation queue have been finalised (objects which might have been put there by your previous call to Collect). If you want a chance for those objects to be collected then you need another call to Collect after calling WaitForPendingFi...
How to check if activity is in foreground or in visible background?
...xtends TimerTask
{
private static final long FOREGROUND_CHECK_PERIOD = 5000;
private static final long FIRST_DELAY = 3000;
private Activity m_activity;
private Timer m_timer;
public ActivityForegroundChecker (Activity p_activity)
{
m_activity = p_acti...
Print new output on same line [duplicate]
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This answer turned up in the low quality review queue, presumably because you don't provide any explanation of the code. If this code answers the question, consider adding adding some text explaining the code in your answer. This way, you are far more likely to get more up...