sqlite perf/safety tradeoff

server/mapobjectdb/accessor.go

@@ -53,8 +53,12 @@ type SearchQuery struct {
 }
 
 type DBAccessor interface {
+	//migrates the database
 	Migrate() error
 
+	//true = speed,unsafe / false = safe
+	EnableSpeedSafetyTradeoff(enableSpeed bool) error
+
 	//Generic map objects (poi, etc)
 	GetMapData(q SearchQuery) ([]*MapObject, error)
 	RemoveMapData(pos *coords.MapBlockCoords) error

server/mapobjectdb/sqlite_migrate.go

@@ -9,8 +9,6 @@ import (
 
 const migrateScript = `
 PRAGMA foreign_keys = ON;
--- PRAGMA journal_mode = MEMORY;
--- PRAGMA synchronous = OFF;
 
 create table if not exists objects(
 	id integer primary key autoincrement,
@@ -64,3 +62,15 @@ func (db *Sqlite3Accessor) Migrate() error {
 
 	return nil
 }
+
+func (db *Sqlite3Accessor) EnableSpeedSafetyTradeoff(enableSpeed bool) error {
+	if enableSpeed {
+		_, err := db.db.Exec("PRAGMA journal_mode = MEMORY; PRAGMA synchronous = OFF;")
+		return err
+
+	} else {
+		_, err := db.db.Exec("PRAGMA journal_mode = TRUNCATE; PRAGMA synchronous = ON;")
+		return err
+
+	}
+}

server/mapobjectdb/sqlite_new.go

@@ -7,7 +7,7 @@ import (
 
 func NewSqliteAccessor(filename string) (*Sqlite3Accessor, error) {
 	//TODO: flag/config for unsafe db access
-	db, err := sql.Open("sqlite3", filename+"?_timeout=500&_journal_mode=MEMORY&_synchronous=OFF")
+	db, err := sql.Open("sqlite3", filename+"?_timeout=500")
 	db.SetMaxOpenConns(1)
 
 	if err != nil {

server/tilerendererjob/job.go

@@ -15,7 +15,20 @@ func Job(ctx *app.App) {
 	}
 
 	if rstate.InitialRun {
+		//fast, unsafe mode
+		err := ctx.Objectdb.EnableSpeedSafetyTradeoff(true)
+		if err != nil {
+			panic(err)
+		}
+
 		initialRender(ctx, jobs)
+
+		//normal, safe mode
+		err = ctx.Objectdb.EnableSpeedSafetyTradeoff(false)
+		if err != nil {
+			panic(err)
+		}
+
 	}
 
 	incrementalRender(ctx, jobs)