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ALTER TABLE without locking the table?
.../O overhead associated with copying the table and reconstructing secondary indexes.
see MySQL 5.6 Reference Manual -> InnoDB and Online DDL for more info.
It seems that online DDL also available in MariaDB
Alternatively you can use ALTER ONLINE TABLE to ensure that your ALTER
TABLE does n...
How do I clone a range of array elements to a new array?
...ike to create a new array containing all the elements from X that begin at index 3 and ends in index 7. Sure I can easily write a loop that will do it for me but I would like to keep my code as clean as possible. Is there a method in C# that can do it for me?
...
Setting up two different static directories in node.js Express framework
...${port}` );
console.log(__dirname);
});
// folder structure
/cheatsheet/index.html
/stylesheet/style.css
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How to convert a number to string and vice versa in C++
...of_range).
If conversion succeeded and idx is not 0, idx will contain the index of the first character that was not used for decoding. This could be an index behind the last character.
Finally, the integral types allow to specify a base, for digits larger than 9, the alphabet is assumed (a=10 unti...
How to create a function in a cshtml template?
...ic string GetSomeString(){
return string.Empty;
}
}
<h2>index</h2>
@GetSomeString()
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What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
...know Scope_Identity() , Identity() , @@Identity , and Ident_Current() all get the value of the identity column, but I would love to know the difference.
...
Get column index from column name in python pandas
In R when you need to retrieve a column index based on the name of the column you could do
7 Answers
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What is the minimum valid JSON?
... or a JSONArray as specified by RFC 4627.
snipped
This would mean that all JSON values (including strings, nulls and numbers) are accepted by the JSON object, even though the JSON object technically adheres to RFC 4627.
Note that you could therefore stringify a number in a conformant browser via...
SVN encrypted password store
I installed SVN on a Ubuntu machine and I can't get my head around something.
3 Answers
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How big is too big for a PostgreSQL table?
...u are doing.
Depending on your data distribution you can use a mixture of indexes, filtered indexes, and table partitioning of some kind to speed thing up once you see what performance issues you may or may not have. Your problem will be the same on any other RDMS that I know of. If you only need ...