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Transaction isolation levels relation with locks on table
... on production: imagine that T table is an Invoice table, user X wants to know the invoices of the day and user Y wants to create a new invoice, so while X executes the read of the invoices, Y can't add a new invoice (and when it's about money, people get really mad, especially the bosses).
I ...
Releasing memory in Python
...ere a way to force Python to release all the memory that was used (if you know you won't be using that much memory again)?
No, there is not. But there is an easy workaround: child processes.
If you need 500MB of temporary storage for 5 minutes, but after that you need to run for another 2 hours a...
Hg: How to do a rebase like git's rebase
...lible trace, and rebasing and other history editing techniques hide that.
Now go pick VonC's answer while I put my soapbox away. :)
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Simple insecure two-way data “obfuscation”?
...is that DES is no longer considered state-of-the-art security. That title now goes to the AES algorithm I discuss below.
– Mark Brittingham
Dec 12 '08 at 13:04
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Are email addresses case sensitive?
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Does anyone know of a list of mail products that will (a) reject a John.Doe@company.com when the user john.doe@company.com is valid, or (b) will allow two distinct mailboxes to be created: John.Doe@company.com and john.doe@company.com?
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How do I load an org.w3c.dom.Document from XML in a string?
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I realize now that I shouldn't just copy-and-paste the accepted answer but rather read through.
– Vitaly Sazanovich
Nov 13 '13 at 17:45
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C++ lambda with captures as a function pointer
...callback(fpath);
}
int main()
{
vector<string> entries;
// ... now the @ftw can accept lambda
int ret = ftw("/etc", [&](const char *fpath) -> int {
entries.push_back(fpath);
return 0;
});
// ... and function object too
struct _ {
static int lambda(vector<s...
Auto-center map with multiple markers in Google Maps API v3
...s[i][0]);
infowindow.open(map, marker);
}
})(marker, i));
}
//now fit the map to the newly inclusive bounds
map.fitBounds(bounds);
//(optional) restore the zoom level after the map is done scaling
var listener = google.maps.event.addListener(map, "idle", function () {
map.setZoom(3...
.NET - Dictionary locking vs. ConcurrentDictionary
...gging the clerk, this will anger the other customers in line behind you.
Now consider this. In the store with one clerk, what if you get all the way to the front of the line, and ask the clerk "Do you have any toilet paper", and he says "Yes", and then you go "Ok, I'll get back to you when I know ...
How to select all records from one table that do not exist in another table?
...n are just null. Then you tell, ok i only want that are null. This way you now have all rows in A that didn't have a match In B
– Muhammad Umer
Mar 6 '18 at 18:02
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