For an iOS application using Couchbase Lite framework (version 1.3.1 (build
6)), a CBLLiveQuery is taking considerable time (about 4-5 seconds) for a
database that is not having more than 1000 documents. The view is emitting
document with key as date (from a chat message). The CBLView structure is
as below:
if let aView: CBLView = self.database?.viewNamed("cmview"){
aView.setMapBlock({ (doc, emit) in
if let messageDate = doc["messageDate"]{
emit(messageDate, doc)
}
}, version: "1")
}
messageDate is a CBLJSON's date instance for
example 2017-07-19T14:07:15.469Z
The corresponding query;s structure is:
if let aView = self.database?.existingViewNamed("cmview"){
chatMessagesQuery = aView.createQuery().asLive()
if let query = chatMessagesQuery{
let loggedInUserDocumentID = <a UUID string>
let otherUserDocumentID = <a UUID string>
let predicate = NSPredicate(format: "(value.fromId = %@ &&
value.toId = %@) || (value.fromId = %@ && value.toId = %@)",
loggedInUserDocumentID,otherUserDocumentID,otherUserDocumentID,loggedInUserDocumentID)
query.postFilter = predicate
query.descending = true
query.limit = 30 //The query is fetching documents in
batches of 30 each
do{
_ = try query.run()
}catch{
print("Encountered error: \(error) while fetching chat
messages.")
}
}
}
What can be the reason behind slow performing query? The documents are
already synced to the iOS device on which application is running. How can I
be sure that the view is getting properly indexed or not. The document size
is small.
The first batch fetch time is long.
Thanks
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