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






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






3. Adds a document to a collection.






4. 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.






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






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






7. Set or list of values.






8. 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 },






9. command to start the mongo shell.






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






11. Update a document in the collection.






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






13. Returns all the documents matching the optional properties.






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






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






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






17. The standard number representation in the javascript shell.






18. In BSON - represents the largest possible value.






19. Binary-encoded serialization of mongo documents.






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






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






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






23. 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 ] } } }






24. Stored as milliseconds since the epoch.






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






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






27. 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.






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






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






30. String of arbitrary bytes.






31. command to start the mongodb process.






32. Meta query conditional used to negate the selector.






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






34. changes the database on which you are working.






35. command to start the mongo shell.






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






37. Returns all the documents matching the optional properties.






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






39. 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.






40. In BSON - represents the smallest possible value.






41. 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 } }






42. 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"}});






43. Adds a document to a collection.






44. changes the database on which you are working.






45. 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.






46. 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 } }






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






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






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







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