arangosh> a1 = db.example.insert({ a : 1 });
{
"_id" : "example/15663",
"_key" : "15663",
"_rev" : "15663"
}
arangosh> a2 = db.example.replace("example/3903044", { a : 2 });
{
"_id" : "example/3903044",
"_key" : "3903044",
"_oldRev" : "15659",
"_rev" : "15666"
}