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MongoDBquery~5 mins

Pagination pattern with skip and limit in MongoDB - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does the skip() method do in MongoDB pagination?
The skip() method tells MongoDB to ignore a specified number of documents before returning the rest. It helps to jump over documents to start from a certain position in the list.
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beginner
What is the purpose of the limit() method in MongoDB queries?
The limit() method restricts the number of documents returned by a query. It controls how many results you get back, useful for showing a fixed number of items per page.
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intermediate
How do skip() and limit() work together for pagination?
You use skip(n) to jump over the first n documents, then limit(m) to get the next m documents. This combination lets you fetch a specific page of results.
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intermediate
What is a potential downside of using skip() for large page numbers?
Using skip() with large numbers can be slow because MongoDB still has to scan and discard those skipped documents internally before returning results.
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beginner
Write a MongoDB query to get page 3 of a collection with 10 items per page.
Use skip(20).limit(10) because page 3 means skipping 2 pages of 10 items each (2 * 10 = 20), then limiting to 10 items.
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What does db.collection.find().skip(5).limit(10) do?
ASkips first 5 documents, then returns next 10 documents
BReturns first 5 documents, then skips next 10 documents
CReturns 15 documents starting from the beginning
DSkips 10 documents, then returns 5 documents
If you want to show 20 items per page, how many documents do you skip to get page 4?
A20
B40
C80
D60
Which method limits the number of documents returned in MongoDB?
Alimit()
Bskip()
Csort()
Dfind()
Why might using skip() be slow for large values?
ABecause it sorts documents first
BBecause it scans and discards skipped documents internally
CBecause it limits the number of documents
DBecause it caches all documents
What is the correct order to paginate with skip and limit?
Alimit() then skip()
Bsort() then skip()
Cskip() then limit()
Dfind() then limit()
Explain how to use skip and limit together to get a specific page of results in MongoDB.
Think about how you jump over pages and then take a slice.
You got /4 concepts.
    What are some performance considerations when using skip for pagination in MongoDB?
    Consider what happens behind the scenes when skipping many documents.
    You got /3 concepts.

      Practice

      (1/5)
      1.

      What does the skip method do in MongoDB pagination?

      easy
      A. It limits the number of documents returned.
      B. It deletes documents from the collection.
      C. It sorts the documents in ascending order.
      D. It skips a specified number of documents before returning results.

      Solution

      1. Step 1: Understand the role of skip

        The skip method tells MongoDB to ignore a certain number of documents from the start of the result set.

      2. Step 2: Compare with other methods

        limit controls how many documents to return, not skipping. Sorting and deleting are unrelated to skip.

      3. Final Answer:

        It skips a specified number of documents before returning results. -> Option D

      4. Quick Check:

        skip = skip documents [OK]
      Hint: Skip jumps over documents, limit sets how many to show [OK]
      Common Mistakes:
      • Confusing skip with limit
      • Thinking skip sorts documents
      • Assuming skip deletes documents
      2.

      Which of the following is the correct syntax to get the second page of results with 5 documents per page in MongoDB?

      db.collection.find().skip(?).limit(?)
      easy
      A. skip(1).limit(5)
      B. skip(10).limit(5)
      C. skip(5).limit(5)
      D. skip(0).limit(5)

      Solution

      1. Step 1: Calculate skip value for page 2

        Each page has 5 documents, so page 1 skips 0, page 2 skips 5 documents (5 * (2-1) = 5).

      2. Step 2: Set limit to page size

        Limit should be 5 to get 5 documents per page.

      3. Final Answer:

        skip(5).limit(5) -> Option C

      4. Quick Check:

        Page 2 skip = 5, limit = 5 [OK]
      Hint: Skip = pageSize * (pageNumber - 1), limit = pageSize [OK]
      Common Mistakes:
      • Using skip(10) for page 2
      • Setting skip to 1 instead of 5
      • Confusing skip and limit values
      3.

      Given a collection with documents numbered 1 to 10, what documents will this query return?

      db.collection.find().skip(3).limit(4)
      medium
      A. Documents 1 to 4
      B. Documents 4 to 7
      C. Documents 3 to 6
      D. Documents 5 to 8

      Solution

      1. Step 1: Understand skip(3)

        Skip the first 3 documents: documents 1, 2, and 3 are ignored.

      2. Step 2: Apply limit(4)

        Return the next 4 documents after skipping: documents 4, 5, 6, and 7.

      3. Final Answer:

        Documents 4 to 7 -> Option B

      4. Quick Check:

        Skip 3, then limit 4 = docs 4-7 [OK]
      Hint: Skip removes first N, limit picks next M documents [OK]
      Common Mistakes:
      • Counting skip as inclusive
      • Starting limit count before skip
      • Off-by-one errors in document numbers
      4.

      Identify the error in this pagination query to get page 3 with 10 documents per page:

      db.collection.find().skip(20).limit(20)
      medium
      A. limit should be 10, not 20
      B. skip value is too high
      C. skip should be 30 for page 3
      D. No error, query is correct

      Solution

      1. Step 1: Calculate correct skip and limit for page 3

        Skip should be 10 * (3-1) = 20, which is correct here.

      2. Step 2: Check limit value

        Limit should be 10 to get 10 documents per page, but query uses limit(20), which is too many.

      3. Final Answer:

        limit should be 10, not 20 -> Option A

      4. Quick Check:

        Limit = page size = 10 [OK]
      Hint: Limit equals page size, skip = pageSize*(page-1) [OK]
      Common Mistakes:
      • Setting limit equal to skip
      • Using skip as page number
      • Assuming no limit needed
      5.

      You want to display page 4 of a product list with 8 items per page. However, the total products are 30. Which query correctly handles this pagination without returning empty results?

      db.products.find().skip(?).limit(?)
      hard
      A. skip(24).limit(8)
      B. skip(32).limit(8)
      C. skip(16).limit(8)
      D. skip(30).limit(8)

      Solution

      1. Step 1: Calculate skip for page 4

        Skip = 8 * (4-1) = 24 documents to reach page 4.

      2. Step 2: Check total documents and limit

        Total is 30, so skipping 24 leaves 6 documents (30-24). Limit 8 is okay; it will return only available 6 documents without error.

      3. Step 3: Analyze other options

        skip(32) and skip(30) exceed total documents, returning empty results. skip(16) is for page 3, not page 4.

      4. Final Answer:

        skip(24).limit(8) -> Option A

      5. Quick Check:

        Page 4 skip = 24, limit = 8, total 30 [OK]
      Hint: Skip = pageSize*(page-1), limit = pageSize, check total docs [OK]
      Common Mistakes:
      • Skipping beyond total documents
      • Using wrong skip for page number
      • Ignoring total document count