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When should I use a composite index?
... it compares 5 ways of doing lat/lng searches: http://mysql.rjweb.org/doc.php/latlng#representation_choices (It references the link given above as one of the 5.) One of the other ways is this, and it points out that they are optimal for the particular case:
INDEX(geolat, geolng),
INDEX(geolng, g...
Where is the Java SDK folder in my computer? Ubuntu 12.04
... steps to get Java directory
Step 1:
$ whereis java
java: /usr/bin/java /etc/java /usr/share/java
That tells the command java resides in /usr/bin/java.
Dig again:
Step 2:
$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2009-01-15 18:34 /usr/bin/java -> /etc/alternatives/java
So, now we k...
sendmail: how to configure sendmail on ubuntu? [closed]
...are located at the following (in case you want to update them manually):
/etc/mail/sendmail.conf
/etc/cron.d/sendmail
/etc/mail/sendmail.mc
You can test sendmail to see if it is properly configured and setup by typing the following into the command line:
$ echo "My test email being sent from sen...
When do I need to use a semicolon vs a slash in Oracle SQL?
...age or one specific version of your runtime environment (Java 7, .Net 4.0, PHP 5.x, ...)
– a_horse_with_no_name
Nov 21 '13 at 14:49
2
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Convert JavaScript string in dot notation into an object reference
...the first place (most ideal if it's only client-side or only server-side), etc. (A pre-existing unique id would be inelegant to add, but could be used if the spec otherwise requires its existence regardless.)
case 2: Working with serialized data, or data that will be displayed to the user. L...
What is the minimum I have to do to create an RPM file?
...inary "foobar", with only a couple of dependencies. It has a config file, /etc/foobar.conf and should be installed in /usr/bin/foobar.
...
nginx missing sites-available directory
... virtual hosts. The problem I am having is that I can't seem to find the /etc/nginx/sites-available directory.
3 Answers
...
How do I parse command line arguments in Bash?
...n argument) (without getopt[s])
Usage demo-space-separated.sh -e conf -s /etc -l /usr/lib /etc/hosts
cat >/tmp/demo-space-separated.sh <<'EOF'
#!/bin/bash
POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"
case $key in
-e|--extension)
EXTENSION="$2"
shift # past argument
s...
How does the Amazon Recommendation feature work?
...s added to carts but abandoned.
Pricing experiments online (A/B testing, etc.) where they offer the same products at different prices and see the results
Packaging experiments (A/B testing, etc.) where they offer different products in different "bundles" or discount various pairings of items
W...
How to stop and restart memcached server?
...
Using root, try something like this:
/etc/init.d/memcached restart
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