Fixing #52 - High CPU Load when a high traffic from DXC

foldynl · May 4, 2022 · 60f2d80 · 60f2d80
1 parent 18fc2c2
commit 60f2d80
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Showing 2 changed files with 8 additions and 4 deletions.
diff --git a/data/Data.cpp b/data/Data.cpp
@@ -46,14 +46,14 @@ DxccStatus Data::dxccStatus(int dxcc, const QString &band, const QString &mode)
 
     QSqlQuery query;
 
-    if ( ! query.prepare("SELECT (SELECT contacts.callsign FROM contacts WHERE dxcc = :dxcc " + filter + " ORDER BY start_time ASC LIMIT 1) as entity,"
-                  "(SELECT contacts.callsign FROM contacts WHERE dxcc = :dxcc AND band = :band " + filter + " ORDER BY start_time ASC LIMIT 1) as band,"
+    if ( ! query.prepare("SELECT (SELECT contacts.callsign FROM contacts WHERE dxcc = :dxcc " + filter + " LIMIT 1) as entity,"
+                  "(SELECT contacts.callsign FROM contacts WHERE dxcc = :dxcc AND band = :band " + filter + " LIMIT 1) as band,"
                   "(SELECT contacts.callsign FROM contacts INNER JOIN modes ON (modes.name = contacts.mode)"
                   "        WHERE contacts.dxcc = :dxcc AND modes.dxcc = " + sql_mode + filter +
-                  "        ORDER BY start_time ASC LIMIT 1) as mode,"
+                  "        LIMIT 1) as mode,"
                   "(SELECT contacts.callsign FROM contacts INNER JOIN modes ON (modes.name = contacts.mode)"
                   "        WHERE contacts.dxcc = :dxcc AND modes.dxcc = " + sql_mode + filter +
-                  "        AND band = :band ORDER BY start_time ASC LIMIT 1) as slot;") )
+                  "        AND band = :band LIMIT 1) as slot;") )
     {
         qWarning() << "Cannot prepare Select statement";
         return DxccStatus::UnknownStatus;

diff --git a/res/sql/migration_008.sql b/res/sql/migration_008.sql
@@ -13,3 +13,7 @@ CREATE TABLE IF NOT EXISTS alert_rules
         spotter_country INTEGER,
         spotter_continent TEXT
 );
+
+CREATE INDEX "dxcc_idx" ON "contacts" (
+        "dxcc"
+);