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How to debug Lock wait timeout exceeded on MySQL?
...-----+-------+
1 row in set (0.01 sec)
You can set it to higher value in /etc/my.cnf permanently with this line
[mysqld]
innodb_lock_wait_timeout=120
and restart mysql. If you cannot restart mysql at this time, run this:
SET GLOBAL innodb_lock_wait_timeout = 120;
You could also just set it for t...
Set default CRAN mirror permanent in R
...tilde expansion). If this variable is
unset, the default is R_HOME/etc/Rprofile.site, which is used if
it exists (which it does not in a 'factory-fresh' installation).
So do Sys.getenv("R_PROFILE") for the first option, or Sys.getenv("R_HOME") or R.home() for the second option. On m...
Find difference between timestamps in seconds in PostgreSQL
... including seconds. The OP wants not only seconds but also minutes, hours, etc
– Clodoaldo Neto
Dec 24 '12 at 12:39
6
...
What is the significance of #pragma marks? Why do we need #pragma marks?
... Table View Protocol Methods, AlertView Methods, Init Methods, Declaration etc.
#pragma mark is the facility for XCode but it has no impact on your code. It merely helps to make it easier to find methods while coding.
shar...
How to find out element position in slice?
...
Another option is to use higher order functions and closures for creation of generic functions. I added answer with an example.
– Hodza
Aug 13 '13 at 8:17
...
R object identification
...t(d=1:26, e=letters))
data(cars)
obj <- lm(dist ~ speed, data=cars)
..etc.
If obj is an S3 or S4 object, you can also try methods or showMethods, showClass, etc. Patrick Burns' R Inferno has a pretty good section on this (sec #7).
EDIT: Dirk and Hadley mention str(obj) in their answers. It ...
How can I create tests in Android Studio?
...ion to make it a real test, but that that is pretty easy to do with the recorder, too. Watch this video to go a little deeper.
Further Study
I'd watch the videos first and then read through the documentation. It is all pretty helpful. The last link is to a series of articles that cover some importan...
Why use finally in C#?
...any time you use unmanaged code requests like stream readers, db requests, etc; and you want to catch the exception then use try catch finally and close the stream, data reader, etc. in the finally, if you don't when it errors the connection doesn't get closed, this is really bad with db requests
...
Sorting an IList in C#
...d an Engine property, I believe you could sort as follows:
from c in list
orderby c.Engine
select c;
Edit: You do need to be quick to get answers in here. As I presented a slightly different syntax to the other answers, I will leave my answer - however, the other answers presented are equally val...
Check whether HTML element has scrollbars
...lution, but it worked for me. Robert, for those cases, couldn't you also fetch the css overflow property to test for those cases (eg div.scrollHeight>div.clientHeight && !(div.style.overflow && div.style.overflow == 'hidden'))?
– vol7ron
Sep...