large-data-volumes

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Architecture behind large-scale social sites like Twitter - help with a new startup. [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical andcannot be reasonably answered in its current form. For help clari[详细]

2023-04-09 07:33 分类：问答
Getting specific rows from recordset

I have a big database result set and I want get specific rows from them with 1 Query: 1., 60. and 61.,120.[详细]

2023-04-08 08:42 分类：问答
Large data processing technology & books [closed]

It开发者_Python百科's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical andcannot be reasonably answered in its current for[详细]

2023-04-06 03:44 分类：问答
Searching large data set for multiple strings

I am working with two sets of data: Set 1 has 500 members in a single column (all strings) Set 2 has 30,000 members in two columns (tab delimited) where column 1 is a numerical ID number and column 2[详细]

2023-03-31 00:55 分类：问答
Java implementation of singular value decomposition for large sparse matrices

I\'m just wondering if anyone out there knows of a java implementation of singular value decomposition (SVD) for large sparse matrices? I need this implementation for latent semantic analysis (LSA).[详细]

2023-03-23 07:05 分类：问答
Editing large text files on linux ( 5 - 10gb)

Basically, i need a file of specified format and large size(Around 10gb). To get this, i am copying the contents of my original file into the same file, multiple times,to increase its size. I dont car[详细]

2023-03-23 00:58 分类：问答
Crypt large amount of data in PHP

I develop a software which have to crypt data before to send it to another instance of the same soft (which have to decrypt it of course). I first use op开发者_运维知识库enssl_public_encrypt / openssl[详细]

2023-03-21 04:07 分类：问答
"Simulating" a 64-bit integer with two 32-bit integers

I\'m writing a very computationally intense procedure for a mobile device and I\'m limited to 32-bit CPUs. In essence, I\'m performing dot products of huge sets of data (>12k signed 16-bit integers).[详细]

2023-03-12 05:20 分类：问答
sorting 1 billion rows by one varchar column in MYSQL quickly

I have 1 billion rows stored in MYSQL, I need to output them alphabetically by the a varchar column, what\'s the most eff开发者_运维知识库icient way of go about it.using other linux utilites like sort[详细]

2023-03-11 22:36 分类：问答
code performance question

Let\'s say I have a relatively large list of an object MyObjectModel called MyBigList. One of the properties of MyObjectModel is an int called ObjectID. In theory, I think MyBigList could reach 15-20M[详细]

2023-03-10 13:05 分类：问答