~jomco/straatnaam: Speedup final view insert with analyse

87310e1117c6590f70dc9c35deee8db4bd5459ac — Remco van 't Veer 3 months ago fa4c43a

Speedup final view insert with analyse

Sometimes (when track_counts=off maybe?) the query planner takes the
wrong approach when selecting data for the "bag" table and the statement
takes many hours to finish instead of minutes.

patch browse .tar.gz

1 files changed, 8 insertions(+), 1 deletions(-)

M src/straatnaam/lvbag.clj

M src/straatnaam/lvbag.clj => src/straatnaam/lvbag.clj +8 -1

@@ 304,7 304,14 @@
 (defn- insert-bag! [db sn]
   (log/debug "inserting bag data for" sn)
   (sql/db-do-commands db true
-                      [(str "SET SCHEMA '" sn "'")
+                      [;; Force running analyze to help query planner
+                       ;; in the next insert step, otherwise it may
+                       ;; take a very long time.
+                       (str "ANALYSE " (->> template-tables
+                                            (map #(str sn "." %))
+                                            (string/join ", ")))
+
+                       (str "SET SCHEMA '" sn "'")
                        (str "INSERT INTO bag "
                             ;; Keeping the query in the source code
                             ;; because putting it in the template