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. Returns one document matching the optional properties.






3. 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 } }






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






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






6. 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.






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






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






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






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






11. 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 } }






12. Returns all the documents matching the optional properties.






13. 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 },






14. The standard number representation in the javascript shell.






15. command to start the mongo shell.






16. 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 ] } } }






17. Returns help information for a command.






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






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






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






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






22. 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.






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






24. Adds a document to a collection.






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






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






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






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






29. changes the database on which you are working.






30. Stored as milliseconds since the epoch.






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






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






33. command to start the mongodb process.






34. Update a document in the collection.






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






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






37. Unique 12-byte ID for documents.






38. 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.






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






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. 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 } }






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






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






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






45. Returns all the documents matching the optional properties.






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






47. In BSON - represents the smallest possible value.






48. Meta query conditional used to negate the selector.






49. String of arbitrary bytes.






50. 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.