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What are the best practices for using a GUID as a primary key, specifically regarding performance?
I have an application that uses GUID as the Primary Key in almost all tables and I have read that there are issues about performance when using GUID as Primary Key. Honestly, I haven't seen any problem, but I'm about to start a new application and I still want to use the GUIDs as the Primary Keys, b...
How to remove underline from a name on hover
...5 '11 at 10:30
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Pure JavaScript Send POST Data Without a Form
...aceback, sys, json
log_lock = threading.Lock()
log_next_thread_id = 0
# Local log functiondef
def Log(module, msg):
with log_lock:
thread = threading.current_thread().__name__
msg = "%s %s: %s" % (module, thread, msg)
sys.stderr.write(msg + '\n')
def Lo...
Create a nonclustered non-unique index within the CREATE TABLE statement with SQL Server
...mary key and unique constraints are implemented in terms of an index is a side effect. To manage indexes, you have CREATE/ALTER/DROP INDEX, as you are well aware.
Why do you have a such a requirement as to add non-unique-non-clustered indexes in the CREATE TABLE statement?
Note that SQL Server 201...
After array_filter(), how can I reset the keys to go in numerical order starting at 0
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If you call array_values on your array, it will be reindexed from zero.
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How to understand Locality Sensitive Hashing?
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why it is called locality sensitive ?because the assignement of each bit is depend on the locality of the data point towards each plan ?
– nawara
Jun 3 '13 at 20:31
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Explain the concept of a stack frame in a nutshell
It seems that I get the idea of call stack in programming language design. But I cannot find (probably, I just don't search hard enough) any decent explanation of what stack frame is.
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StatusbarTools 扩展 - 状态栏自定义工具 · App Inventor 2 中文网
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when Screen1.Initialize
do
// 设置状态栏为蓝色背景
call StatusbarTools1.SetBackgroundColor "#2196F3"
// 设置图标为白色
call StatusbarTools1.SetIconColor "Light"
透明状态栏
when Button1.Click
do
// 启用透明背景
call S...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...NUM = 2;
final static int RECOMMENDER_NUM = 3;
public static void main(String[] args) throws IOException, TasteException {
String file = "datafile/item.csv";
DataModel model = new FileDataModel(new File(file));
UserSimilarity user = new EuclideanDistanceSimilar...
Specify JDK for Maven to use
...d binary compatiblility -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<targ...