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. Standard binary data type.






2. command to start the mongo shell.






3. Returns help information for a command.






4. command to start the mongodb process.






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






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






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






8. 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.






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






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






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






12. 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.






13. Unique 12-byte ID for documents.






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






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






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






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






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






19. set of UTF-8 characters.






20. Adds a document to a collection.






21. Stored as milliseconds since the epoch.






22. In BSON - represents the smallest possible value.






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






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






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






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






27. 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 } }






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






29. In BSON - represents the largest possible value.






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






31. changes the database on which you are working.






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






33. 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.






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






35. changes the database on which you are working.






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






37. 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.






38. 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"}});






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






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






41. Returns all the documents matching the optional properties.






42. String of arbitrary bytes.






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






44. Set or list of values.






45. command to start the mongo shell.






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






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






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






49. Returns all the documents matching the optional properties.






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