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add an index to significantly speed up get_fresh_msg_cnt()

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B. Petersen
2020-09-02 16:55:40 +02:00
parent dd682e87db
commit 8727e0acf8
2 changed files with 20 additions and 0 deletions
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10
src/chat.rs
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@@ -375,6 +375,16 @@ impl ChatId {
}
pub async fn get_fresh_msg_cnt(self, context: &Context) -> usize {
// this function is typically used to show a badge counter beside _each_ chatlist item.
// to make this as fast as possible, esp. on older devices, we added an combined index over the rows used for querying.
// so if you alter the query here, you may want to alter the index over `(state, hidden, chat_id)` in `sql.rs`.
//
// the impact if the index is significant once the database grows:
// - on an older android4 with 18k messages, query-time decreased from 110ms to 2ms
// - on an mid-class moto-g or iphone7 with 50k messages, query-time decreased from 26ms or 6ms to 0-1ms
// the times are average, no matter if there are fresh messages or not -
// and have to be multiplied by the number of items shown at once on the chatlist,
// so savings up to 2 seconds are possible on older devices - newer ones will feel "snappier" :)
context
.sql
.query_get_value::<i32>(