Can a MongoDB key have two arrays?

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How do I index two arrays in MongoDB?

db.hello.ensureIndex({"array1":1, "array2":1}) MongoDB does not allow that, because they say "it can get out of hand". However, I know that my arrays will never exceed length of 3. How can I hack MongoDB to allow indexing multiple arrays at once? When using a compound index, at most one of indexed values in any document can be an array. So if we have an index on {a: 1, b: 1}, the following documents are both fine: {a: [1, 2], b: 1} {a: 1, b: [1, 2]} This document...

Answer:

The short answer to your question is; you don't. The only option available to you is to store the every...

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TIMEX at Stack Overflow Mark as irrelevant Undo

Other solutions

How would you design an algorithm that merges n sorted arrays into one, if we can only merge two arrays at a time and we want to minimize the total number of  times we move an element?

Assume you are given n sorted arrays of different sizes. You are allowed to merge any two arrays into a single new sorted array and proceed in this manner until only one array is left. How would you design an algorithm that achieves this task and uses...

Answer:

A greedy strategy works: always merge the two shortest arrays into a new one. Below I assume that merging...

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Michal Forišek at Quora Mark as irrelevant Undo

Java method to check two int arrays to see if they are mirror images?

Can't seem to figure this out. Question is: Create a method called mirrorImage, which takes two integer arrays as input parameters. You may assume that the two actual parameters have the same length. Your method should return true if the arrays are the...

Answer:

Do something like: if (data1.length != data2.length) return false; for (int i = 0, j = data1.length...

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Kevin at Yahoo! Answers Mark as irrelevant Undo

Why is my solution for adding two binary arrays not working?

Following is the problem from CLRS book Consider the problem of adding two n-bit binary integers, stored in two n-element arrays A and B. The sum of the two integers should be stored in binary form in an (n +1)element array C. State the problem formally...

Answer:

Did you try to debug it? Edit: Aha!! Your program works perfectly. It;s a feature, not a bug. Probably...

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Jayesh Lalwani at Quora Mark as irrelevant Undo

MongoDB: How would RAM be used if two mongod instances run on same machine?

Since MongoDB uses OS mapped file, it would use up all RAM as the data grows. It would turn cold into disk and keep hot data in RAM so it can still be efficient. Now I am wondering what if two or more mongod instances running on same machine. Would two...

Answer:

Would two mongod instances fight with each other for RAM and hurt performance? Yes, they would fight...

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Gaëtan Voyer-Perrault at Quora Mark as irrelevant Undo

How do I combine two arrays together in Javascript?

var olderPri=new Array(475,380); var lowMilage=new Array(97,43); I want both arrays to be combined with each other so that when I display the information from the arrays by ...show more

Answer:

http://www.google.com/#hl=en&safe=off&q=...

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AZDBCJYDVK7F3FHFO447U6MI7M at Yahoo! Answers Mark as irrelevant Undo

MongoDB: Can two MapReduce jobs run concurrently on a mongod process?

e.g: Single Mongodb node, I have two cases which will do map reduce job on mongod process, so if they will be executed concurrently? NOTE: NOT SHARDING MODE

Answer:

In theory, yes. Map Reduce will yield during processing. But each mongod process only has one instance...

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Gaëtan Voyer-Perrault at Quora Mark as irrelevant Undo

Comparing two java arrays???? anyone help?

heres the problem... my first array is Tim[] i type in its size(including the second array) and i inputted 4 elements....[1,2,2,4] the second array Moi[] consists of the elements[1,2,3,4] when i compare them regarding if they have equal elements or the...

Answer:

The reason you get two 2's is that Tim contains two 2's. Wrather than using an array to store the common...

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max g at Yahoo! Answers Mark as irrelevant Undo

Write a program using two dimensional arrays.?

Write a program using two dimensional arrays that lists the odd numbers and even number separately in a given Answers with proof pls.

Answer:

it's not right for you to ask us to do your homework for you. use your brain. that's why you are going...

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Neillvan at Yahoo! Answers Mark as irrelevant Undo

"a" and "b" are two arrays. They both have "n" elements. What does the following algorithm do?

"a" and "b" are two arrays. They both have "n" elements. What does the following algorithm do? Try the following example if you need an example: a[0] = 2, a[1] = 1, a[2] = 3, b[0] = -2, b[1] = 42, b[2] = 22, n = 3. i <...

Answer:

Sometimes adding some indents will help figure out what's going on. In your algorithm, you have a lot...

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karenL01... at Yahoo! Answers Mark as irrelevant Undo

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