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. Returns one document matching the optional properties.






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






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






4. command to start the mongodb process.






5. set of UTF-8 characters.






6. 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 } }






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






8. Standard binary data type.






9. command to start the mongo shell.






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






11. 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.






12. ...






13. 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 } }






14. changes the database on which you are working.






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






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






17. Set or list of values.






18. String of arbitrary bytes.






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






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






21. The standard number representation in the javascript shell.






22. Returns all the documents matching the optional properties.






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






24. 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 },






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






26. Meta query conditional used to negate the selector.






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






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






29. Unique 12-byte ID for documents.






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






31. In BSON - represents the smallest possible value.






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






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






34. Update a document in the collection.






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






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






37. 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.






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






39. 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.






40. Adds a document to a collection.






41. Adds a document to a collection.






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






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






44. 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"}});






45. Returns all the documents matching the optional properties.






46. In BSON - represents the largest possible value.






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






48. 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 ] } } }






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






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







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