diff --git a/db/xmet.sql b/db/xmet.sql
index ce635dd..6540331 100644
--- a/db/xmet.sql
+++ b/db/xmet.sql
@@ -113,6 +113,9 @@ create table xmet_sounding (
     data_source_other    TEXT NOT NULL
 );
 
+create index xmet_sounding_station_idx                     on xmet_sounding (station);
+create index xmet_sounding_timestamp_observed_released_idx on xmet_sounding (timestamp_observed, timestamp_released);
+
 select AddGeometryColumn('xmet_sounding', 'location', 4326, 'POINT'),
        CreateSpatialIndex('xmet_sounding', 'location');
 
@@ -134,4 +137,6 @@ create table xmet_sounding_sample (
     FOREIGN KEY (sounding_id) REFERENCES xmet_sounding (id)
 );
 
+create index xmet_sounding_sample_sounding_id_idx on xmet_sounding_sample (sounding_id);
+
 commit;