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. 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.






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






3. command to start the mongodb process.






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






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






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. Returns help information for a command.






8. 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.






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






10. String of arbitrary bytes.






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






12. The standard number representation in the javascript shell.






13. Binary-encoded serialization of mongo documents.






14. ...






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






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






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






18. 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 } }






19. Returns one document matching the optional properties.






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






21. 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.






22. 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.






23. 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 } }






24. Meta query conditional used to negate the selector.






25. Unique 12-byte ID for documents.






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






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






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. Adds a document to a collection.






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






31. Set or list of values.






32. Returns all the documents matching the optional properties.






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






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






35. command to start the mongodb process.






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






37. 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 } }






38. changes the database on which you are working.






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






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






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






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






43. Returns help information for a command.






44. In BSON - represents the largest possible value.






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






46. 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 },






47. set of UTF-8 characters.






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






49. command to start the mongo shell.






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






Can you answer 50 questions in 15 minutes?



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