mysql - Should all related data be stored in a single shard if we use sharding to scale out relational databases? -


if have multiple shards storing subsets of data in scaled out relational database, how relationships managed? related data in different tables entity in same shards? or can have relationships between data in different shards? how managed?


Comments

Post a Comment

Popular posts from this blog

python 2.7 - Given three nested dictionaries, sort the top two nested dictionaries from a value in the innermost dictionary? -

i trying sort both outermost dictionary , "middle" dictionary value of "cal" (highest first) in innermost dictionary. accomplish using ordereddict. given example below, trying accomplish: for foods, order food subtypes highest calorie content (i.e - pizza, pesto should appear first because has higher calories when compared cheese. order foods highest calorie content (i.e - pizza should appear first has subtype more calories other food) i have following data: foods = { "apple": { "red": { "cal": "1", "taste": "4" }, "green": { "cal": "2", "taste": "6" } }, "pizza": { "pesto": { "cal": "200", "taste": "9" }, "cheese": { ...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more