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Multiple INSERT statements vs. single INSERT with multiple VALUES
...].
I tried one more experiment (Script) which was to re-run the original test but looking at three different cases.
First Name and Last Name Strings of length 10 characters with no duplicates.
First Name and Last Name Strings of length 50 characters with no duplicates.
First Name and Last Name S...
Python Pandas: Get index of rows which column matches certain value
... If you only want back the index, what's the overhead of df[dftest].index? Does this create an intermediate data frame (whose data may be gibabytes). What about dftest? Doesn't this also allocate a very large intermediate object where the returned index may be very small, or even empty...
List columns with indexes in PostgreSQL
...
Create some test data...
create table test (a int, b int, c int, constraint pk_test primary key(a, b));
create table test2 (a int, b int, c int, constraint uk_test2 unique (b, c));
create table test3 (a int, b int, c int, constraint uk_...
Building vs. Compiling (Java)
...y includes:
Generating sources (sometimes).
Compiling sources.
Compiling test sources.
Executing tests (unit tests, integration tests, etc).
Packaging (into jar, war, ejb-jar, ear).
Running health checks (static analyzers like Checkstyle, Findbugs, PMD, test coverage, etc).
Generating reports.
S...
Make a program run slowly
...ptop Per Child, and don't forget to donate it to a child once you are done testing) with a slow CPU and run your program.
Hope it helps.
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How do you use variables in a simple PostgreSQL script?
... get the last insert id:
DO $$
DECLARE lastid bigint;
BEGIN
INSERT INTO test (name) VALUES ('Test Name')
RETURNING id INTO lastid;
SELECT * FROM test WHERE id = lastid;
END $$;
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How to supply value to an annotation from a Constant java
...a quick example, I use something like this fairly often:
import org.junit.Test;
import static org.junit.Assert.*;
public class MyTestClass
{
private static final int TEST_TIMEOUT = 60000; // one minute per test
@Test(timeout=TEST_TIMEOUT)
public void testJDK()
{
assertTrue...
What are the performance characteristics of sqlite with very large database files? [closed]
...
So I did some tests with sqlite for very large files, and came to some conclusions (at least for my specific application).
The tests involve a single sqlite file with either a single table, or multiple tables. Each table had about 8 colum...
How to convert PascalCase to pascal_case?
...
Try this on for size:
$tests = array(
'simpleTest' => 'simple_test',
'easy' => 'easy',
'HTML' => 'html',
'simpleXML' => 'simple_xml',
'PDFLoad' => 'pdf_load',
'startMIDDLELast' => 'start_middle_last',
'AString' =>...
Node.js vs .Net performance
...
I did a rudimentary performance test between nodejs and IIS.
IIS is about 2.5 times faster than nodejs when dishing out "hello, world!".
code below.
my hardware:
Dell Latitude E6510, Core i5 (dual core), 8 GB RAM, Windows 7 Enterprise 64 bit OS
node serve...