// Create an index
db.books.createIndex({title:1})
// Type 1 means ascending; -1 means descending

// Create a unique index
db.books.createIndex( {isbn:1},{unique:true} )

// Create a index on multiple fields (compound index)
db.books.createIndex({title:1, author:-1})

// Show all indexes in a collection
db.books.getIndexes()

// Drop an index
db.books.dropIndex({author:-1})

// Show index statistics
db.books.stats()