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. Javascript code. Documents can contain code as values.






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






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






4. 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 } }






5. 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.






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






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






8. 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 } }






9. 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.






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






11. changes the database on which you are working.






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






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






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






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






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






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






18. The standard number representation in the javascript shell.






19. String of arbitrary bytes.






20. 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.






21. 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"}});






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






23. 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.






24. 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 ] } } }






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






26. Adds a document to a collection.






27. Set or list of values.






28. 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 } }






29. Binary-encoded serialization of mongo documents.






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






31. command to start the mongodb process.






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






33. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});






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






35. command to start the mongo shell.






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






37. command to start the mongodb process.






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






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






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






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






42. Unique 12-byte ID for documents.






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






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






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






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






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






48. command to start the mongo shell.






49. ...






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