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






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






3. Set or list of values.






4. 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"}});






5. command to start the mongo shell.






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






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






8. Returns help information for a command.






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






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






11. changes the database on which you are working.






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






13. Standard binary data type.






14. 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.






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






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






17. The standard number representation in the javascript shell.






18. 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 } }






19. 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 ] } } }






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






21. 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.






22. Unique 12-byte ID for documents.






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






24. Adds a document to a collection.






25. command to start the mongodb process.






26. 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.






27. set of UTF-8 characters.






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






29. 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.






30. Adds a document to a collection.






31. In BSON - represents the largest possible value.






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






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






34. Stored as milliseconds since the epoch.






35. 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 },






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






37. Returns one document matching the optional properties.






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






39. 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.






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






41. Binary-encoded serialization of mongo documents.






42. In BSON - represents the smallest possible value.






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






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






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






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






47. 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.






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






49. changes the database on which you are working.






50. 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 } }