Test your basic knowledge |

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Command to list commands and descriptions of those commands in the context of the database.






2. Flushes all pending writes to data files. The lock option allows one to safely snapshot the database's data files. The async option returns focus to the console immediately while the task runs in the background.






3. Removes all occurrences of each value in the passed in array from the field. ex: { $pullAll : { field : value_array } }






4. Deletes documents from the collection based on the selector.






5. The standard number representation in the javascript shell.






6. Special keys passed in an update call to specify complex update operations - such as alter - adding - or removing keys - and even manipulating arrays and embedded documents.






7. Not supported by the javascript shell and are converted to 64-bit floating point numbers.






8. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.






9. Returns all the documents matching the optional properties.






10. Appends each value in the value_array to the field - if field is an existing array. Otherwise - it sets the field to the array value_array - if field is not present ex: { $pushAll : { field : value_array } }






11. Operator allowing the partial specification of fields in an embedded document in an array.






12. Deletes a given field. ex: { $unset : { field : 1} }






13. Meta query conditional generating a modulus with the selector operand. Checks to see if the field value when divided by one value has the remainder of the second value.






14. Contains query conditional used to check if a value contains the field value.






15. Adds a document to a collection.






16. Binary-encoded serialization of mongo documents.






17. command to start the mongodb process.






18. Array specific conditional allowing matching on multiple elements within an array. The operation is non strict on the sequence of the values in the passed selector array.






19. Meta query conditional used to negate the selector.






20. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});






21. changes the database on which you are working.






22. Not supported by the javascript shell and are converted to 64-bit floating point numbers.






23. Greater than query conditional. ex: db.<col>.find({numVal: {$gt:3}});






24. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});






25. Returns the size of a document after it is converted to BSON from the JSON-like original.






26. Returns all the documents matching the optional properties.






27. Update modifier that set the value of a key and if the key does not exist, it will create the key. ex: db.<col>.update({selector},{"$set":{"someKey":"someValue"}});






28. Appends a value to field - if the field is an existing array. Otherwise it sets the field to the array [value] if field is not present. ex: { $push : { field : value } }






29. command to start the mongodb process.






30. command to start the mongo shell.






31. Standard javascript regular expressions. These can be stored in documents






32. Syntax used for selectors to be specific to a certain element position within an array.






33. Array specific conditional used to select based on the length or set-size of an array field value.






34. Lists all the collections in the database in use.






35. Clone the current database (implied by 'db') from another host.






36. set of UTF-8 characters.






37. Used to describe a variable as not having been initialized.






38. Updates all matching documents, not just the first, that match the selector.






39. Used to represent both a null value and a nonexistent field.






40. In BSON - represents the largest possible value.






41. String of arbitrary bytes.






42. Clone the current database (implied by 'db') from another host.






43. Update modifier used to increment a value. ex: {"$inc":{"counter":2}}






44. Does not contain query conditional used to select documents with the field that is not in the selector list of values.






45. Creates an index on property(s). Options can describe the type of sorting, uniqueness, etc.






46. Update a document in the collection.






47. Command to get help docs on a specific command at the db level.






48. Deletes documents from the collection based on the selector.






49. Removes an element from an array based on the value of the field option being 1 or -1 for last or first element respectively. ex: { $pop : { field : -1 } }






50. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});







Sorry!:) No result found.

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