mongodb/jstests/delx.js

a = db.getSisterDB("delxa" )
b = db.getSisterDB("delxb" )

function setup( mydb ){
    mydb.dropDatabase();
    for ( i=0; i<100; i++ ){
        mydb.foo.insert( { _id : i } );
    }
    mydb.getLastError();
}

setup( a );
setup( b );

assert.eq( 100 , a.foo.find().itcount() , "A1" )
assert.eq( 100 , b.foo.find().itcount() , "A2" )

x = a.foo.find().sort( { _id : 1 } ).batchSize( 60 )
y = b.foo.find().sort( { _id : 1 } ).batchSize( 60 )

x.next();
y.next();

a.foo.remove( { _id : { $gt : 50 } } );

assert.eq( 51 , a.foo.find().itcount() , "B1" )
assert.eq( 100 , b.foo.find().itcount() , "B2" )

assert.eq( 59 , x.itcount() , "C1" ) 
assert.eq( 99 , y.itcount() , "C2" );  // this was asserting because ClientCursor byLoc doesn't take db into consideration