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. Meta query conditional used to negate the selector.






2. ...






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






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






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






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






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






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






9. String of arbitrary bytes.






10. 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 ] } } }






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






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






13. Returns help information for a command.






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






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






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






17. 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.






18. command to start the mongodb process.






19. 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 } }






20. In BSON - represents the smallest possible value.






21. 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.






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






23. Returns all the documents matching the optional properties.






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






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






26. Unique 12-byte ID for documents.






27. Returns help information for a command.






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






29. 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.






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






31. changes the database on which you are working.






32. 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.






33. changes the database on which you are working.






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






35. 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 } }






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






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






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






39. 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.






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






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






42. Adds a document to a collection.






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






44. 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 } }






45. The standard number representation in the javascript shell.






46. Standard binary data type.






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






48. Set or list of values.






49. 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 },






50. command to start the mongodb process.







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests



Major Subjects

Tests & Exams


AP
CLEP
DSST
GRE
SAT
GMAT

Browse all subjects

Browse all tests

Most popular tests