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. Stored as milliseconds since the epoch.






2. changes the database on which you are working.






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






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






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






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






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






8. Returns one document matching the optional properties.






9. Returns all the documents matching the optional properties.






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






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






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






13. command to start the mongo shell.






14. String of arbitrary bytes.






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






16. 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.






17. set of UTF-8 characters.






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






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






20. The standard number representation in the javascript shell.






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






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






23. Unique 12-byte ID for documents.






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






25. command to start the mongodb process.






26. Standard binary data type.






27. 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 } }






28. 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"}});






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






30. command to start the mongo shell.






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






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






33. 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.






34. In BSON - represents the largest possible value.






35. 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 } }






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






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






38. 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 } }






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






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






41. Adds a document to a collection.






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






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






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






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






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






47. 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.






48. ...






49. Adds a document to a collection.






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







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