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What is InnoDB and MyISAM in MySQL?
...Engine does not support tranactions.constraints of MySQL MYISAM There is a bit called concurrent-insert
By default, the variable is set to 1 and concurrent inserts are handled as just described. If it is set to 0, concurrent inserts are disabled. If it is set to 2, concurrent inserts at the end of t...
Cost of storing AMI
...
You are only charged for the storage of the bits that make up your AMI, there are no charges for creating an AMI.
EBS-backed AMIs are made up of snapshots of the EBS volumes that form the AMI. You will pay storage fees for those snapshots according to the rates liste...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...tem to TemperatureValues value
// 限制数据点数量（保留最近100个点）
if length of TemperatureTimestamps > 100 then
remove list item at position 1 from TemperatureTimestamps
remove list item at position 1 from TemperatureValues
end if
// 更新图表显...
Clearing all cookies with JavaScript
...
After a bit of frustration with this myself I knocked together this function which will attempt to delete a named cookie from all paths. Just call this for each of your cookies and you should be closer to deleting every cookie then ...
Why would one use the Publish/Subscribe pattern (in JS/jQuery)?
...ject.
I'll write out a big example below in some pseudo code that looks a bit like JavaScript.
Let's say we have a class Radio and a class Relay:
class Relay {
function RelaySignal(signal) {
//do something we don't care about right now
}
}
class Radio {
function ReceiveSignal...
Subversion stuck due to “previous operation has not finished”?
... traversing up parent directories and running clean up on them, but it's a bit time consuming and 'magic'. Never knew this would return a detailed error, +1.
– Phil Cooper
Nov 28 '14 at 11:05
...
How to convert a string Date to long millseconds
...016 also use the then long outdated classes SimpleDateFormat and Date is a bit more of a mystery to me. java.time, the modern Java date and time API also known as JSR-310, is so much nicer to work with. You can use it on Android through the ThreeTenABP, see this question: How to use ThreeTenABP in A...
When do you use the “this” keyword? [closed]
...esthetically pleasing as possible according to your own tastes. If you ask 10 programmers how to format code, you are going to get about 15 different opinions. A better thing to focus on is how the code is factored. Are things abstracted right? Did I pick meaningful names for things? Is there a lot ...
Booleans, conditional operators and autoboxing
...conditional expression is the result of applying capture conversion (§5.1.10) to lub(T1, T2) (§15.12.2.7).
S1 == <special null type> (see §4.1)
S2 == boolean
T1 == box(S1) == <special null type> (see last item in list of boxing conversions in §5.1.7)
T2 == box(S2) == `Boolean
lub...
How to run a shell script at startup
... file, so :
cp /etc/init.d/skeleton /etc/init.d/your_app
and adapt it a bit.
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