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. Stored as milliseconds since the epoch.






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






3. Data structure used to store all other data in mongo databases.






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






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






6. Meta query conditional used to negate the selector.






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






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






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






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






11. A document contained by a parent document. The embedded document is a value of a key in the parent document.






12. set of UTF-8 characters.






13. command to start the mongodb process.






14. 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 } }






15. The standard number representation in the javascript shell.






16. Javascript code. Documents can contain code as values.






17. Adds a document to a collection.






18. 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.






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






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






21. 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"}});






22. String of arbitrary bytes.






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






24. Removes all occurrences of a value from a field. ex: { $pull : { field : _value } }






25. Unique 12-byte ID for documents.






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






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






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






29. Returns one document matching the optional properties.






30. Returns help information for a command.






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






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






33. Returns all the documents matching the optional properties.






34. Adds a document to a collection.






35. Positional operator that holds the position of the first matched array item in the query. Used to find an array member and then manipulate it. ex: {$inc:{'comments.$.votes':1}} where comments looks like: "comments" : [ { "by" : "joe", "votes" : 3 },






36. Set or list of values.






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






38. Query conditional allowing the selector to choose between more than one optional criteria.






39. 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 } }






40. Update call that inserts a new document if no update match is found. Allows the same code to be used for inserts as well as updates.






41. Returns all the documents matching the optional properties.






42. Returns help information for a command.






43. command to start the mongo shell.






44. Update a document in the collection.






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






46. 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.






47. Returns information about the last operation. Not necessarily error data - the return can contain things like number of records updated.






48. changes the database on which you are working.






49. Standard binary data type.






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