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. 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.






2. 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"}});






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






4. changes the database on which you are working.






5. Unique 12-byte ID for documents.






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






7. Adds a document to a collection.






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






9. String of arbitrary bytes.






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






11. Standard binary data type.






12. The standard number representation in the javascript shell.






13. command to start the mongodb process.






14. Binary-encoded serialization of mongo documents.






15. 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 } }






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






17. 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.






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






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






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






21. set of UTF-8 characters.






22. Returns help information for a command.






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






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






25. Returns all the documents matching the optional properties.






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






27. 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.






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






29. Returns help information for a command.






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






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






32. In BSON - represents the largest possible value.






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






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






35. command to start the mongo shell.






36. Meta query conditional used to negate the selector.






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






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






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






40. Stored as milliseconds since the epoch.






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






42. Update a document in the collection.






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






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






45. command to start the mongo shell.






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






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






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






49. 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 ] } } }






50. 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.







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