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






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






3. command to start the mongodb process.






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






5. The standard number representation in the javascript shell.






6. Standard binary data type.






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






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






9. command to start the mongo shell.






10. set of UTF-8 characters.






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






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






13. 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.






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






15. String of arbitrary bytes.






16. Meta query conditional used to negate the selector.






17. In BSON - represents the largest possible value.






18. Returns all the documents matching the optional properties.






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






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






21. In BSON - represents the smallest possible value.






22. 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.






23. 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 } }






24. Update a document in the collection.






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






26. 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.






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






28. Command to list commands and descriptions of those commands in the context of the database.






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






30. Unique 12-byte ID for documents.






31. changes the database on which you are working.






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






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






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






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






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






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






39. Returns help information for a command.






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






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






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






43. 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"}});






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






45. 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 },






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






47. Adds a document to a collection.






48. ...






49. command to start the mongodb process.






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 ] } } }







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