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






2. Standard binary data type.






3. command to start the mongo shell.






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






5. 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.






6. 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.






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






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






9. Returns help information for a command.






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






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






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






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






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






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






16. set of UTF-8 characters.






17. Unique 12-byte ID for documents.






18. 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 ] } } }






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






20. command to start the mongodb process.






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






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






23. Returns all the documents matching the optional properties.






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






25. Meta query conditional used to negate the selector.






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






27. Adds a document to a collection.






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






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






30. 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 } }






31. Stored as milliseconds since the epoch.






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






33. 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 } }






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






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






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






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






38. String of arbitrary bytes.






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






40. Binary-encoded serialization of mongo documents.






41. In BSON - represents the smallest possible value.






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






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






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






45. changes the database on which you are working.






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






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






48. Adds a document to a collection.






49. Returns all the documents matching the optional properties.






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.