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 start the mongo shell.






2. Operator allowing the execution of arbitrary javascript as part of the selector.






3. command to start the mongo shell.






4. 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.






5. Adds a value to the array only if its not in the array already. Otherwise, if the field is not present, it sets the field to the array value. ex: { $addToSet : { a : { $each : [ 3 , 5 , 6 ] } } }






6. command to start the mongodb process.






7. set of UTF-8 characters.






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






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






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






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






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






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






14. changes the database on which you are working.






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






16. 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 } }






17. Stored as milliseconds since the epoch.






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






19. Copies an entire database from one name on one server to another name on another server. Omit frmHostName to copy from one name to another on the same server.






20. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.






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






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






23. 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.






24. Returns one document matching the optional properties.






25. Meta query conditional used to negate the selector.






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






27. Adds a document to a collection.






28. Greater than or equal query conditional. ex: db.<col>.find({numVal: {$gte:3}});






29. Update a document in the collection.






30. Command to get help docs on a specific command at the collection level.






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






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






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






34. 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 } }






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






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






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






38. 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 } }






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






40. 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.






41. Standard binary data type.






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






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






44. The standard number representation in the javascript shell.






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






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






47. In BSON - represents the smallest possible value.






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






49. Returns all the documents matching the optional properties.






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