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. Unique 12-byte ID for documents.






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






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






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






5. The standard number representation in the javascript shell.






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






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






8. Binary-encoded serialization of mongo documents.






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






10. Returns help information for a command.






11. 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 } }






12. 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.






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






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






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






16. command to start the mongodb process.






17. Update a document in the collection.






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






19. Adds a document to a collection.






20. Stored as milliseconds since the epoch.






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






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






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






24. changes the database on which you are working.






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






26. Meta query conditional used to negate the selector.






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






28. 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 ] } } }






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






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






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






32. command to start the mongodb process.






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






34. 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 } }






35. In BSON - represents the smallest possible value.






36. Returns all the documents matching the optional properties.






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. String of arbitrary bytes.






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






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






41. Returns help information for a command.






42. 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"}});






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






44. Returns all the documents matching the optional properties.






45. 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.






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






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






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






49. Set or list of values.






50. set of UTF-8 characters.