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






2. Renames a field from the one indicated to the new field name. ex: { $rename : { old_field_name : new_field_name } }






3. 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"}});






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






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






6. Set or list of values.






7. Returns help information for a command.






8. Stored as milliseconds since the epoch.






9. command to start the mongo shell.






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






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






12. Returns help information for a command.






13. Returns one document matching the optional properties.






14. Returns all the documents matching the optional properties.






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






16. Returns all the documents matching the optional properties.






17. command to start the mongodb process.






18. In BSON - represents the largest possible value.






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






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






21. Adds a document to a collection.






22. 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 } }






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






24. ...






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






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






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






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






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






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






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






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






33. 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 } }






34. command to start the mongodb process.






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






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






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






38. Update a document in the collection.






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






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






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






42. changes the database on which you are working.






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






44. Standard binary data type.






45. Binary-encoded serialization of mongo documents.






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






47. 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.






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






49. 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.






50. 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 ] } } }