ANALYZE messages query should be performed regularly for better perfo…

…rmance

waku/waku_archive/driver/builder.nim

@@ -102,6 +102,8 @@ proc new*(
       ## Hence, this should be run after the migration is completed.
       asyncSpawn driver.startPartitionFactory(onFatalErrorAction)
 
+      driver.startAnalyzeTableLoop()
+
       info "waiting for a partition to be created"
       for i in 0 ..< 100:
         if driver.containsAnyPartition():

waku/waku_archive/driver/postgres_driver/postgres_driver.nim

@@ -25,6 +25,8 @@ type PostgresDriver* = ref object of ArchiveDriver
   partitionMngr: PartitionManager
   futLoopPartitionFactory: Future[void]
 
+  futLoopAnalyzeTable: Future[void]
+
 const InsertRowStmtName = "InsertRow"
 const InsertRowStmtDefinition =
   """INSERT INTO messages (id, messageHash, pubsubTopic, contentTopic, payload,
@@ -997,6 +999,10 @@ method close*(s: PostgresDriver): Future[ArchiveDriverResult[void]] {.async.} =
   ## Cancel the partition factory loop
   s.futLoopPartitionFactory.cancelSoon()
 
+  ## Cancel analyze table loop
+  if not s.futLoopAnalyzeTable.isNil():
+    s.futLoopAnalyzeTable.cancelSoon()
+
   ## Close the database connection
   let writeCloseRes = await s.writeConnPool.close()
   let readCloseRes = await s.readConnPool.close()
@@ -1030,6 +1036,7 @@ proc sleep*(
 
   return ok()
 
+const EXPECTED_LOCK_ERROR* = "another waku instance is currently executing a migration"
 proc acquireDatabaseLock*(
     s: PostgresDriver, lockId: int = 841886
 ): Future[ArchiveDriverResult[void]] {.async.} =
@@ -1052,7 +1059,7 @@ proc acquireDatabaseLock*(
     return err("error acquiring a lock: " & error)
 
   if locked == "f":
-    return err("another waku instance is currently executing a migration")
+    return err(EXPECTED_LOCK_ERROR)
 
   return ok()
 
@@ -1508,3 +1515,36 @@ method deleteMessagesOlderThanTimestamp*(
     return err("error in deleteMessagesOlderThanTimestamp: " & $error)
 
   return ok()
+
+############################################
+## TODO: start splitting code better
+
+const AnalyzeQuery = "ANALYZE messages"
+const AnalyzeTableLockId = 111111 ## An arbitrary and different lock id
+const RunAnalyzeInterval = timer.days(1)
+
+proc analyzeTableLoop(self: PostgresDriver) {.async.} =
+  ## The database stats should be calculated regularly so that the planner
+  ## picks up the proper indexes and we have better query performance.
+  while true:
+    debug "analyzeTable lock db"
+    (await self.acquireDatabaseLock(AnalyzeTableLockId)).isOkOr:
+      if error != EXPECTED_LOCK_ERROR:
+        error "failed to acquire lock in analyzeTable", error = error
+      await sleepAsync(RunAnalyzeInterval)
+      continue
+
+    debug "analyzeTable start"
+    (await self.performWriteQuery(AnalyzeQuery)).isOkOr:
+      error "failed to run ANALYZE messages", error = error
+
+    debug "analyzeTable unlock db"
+    (await self.releaseDatabaseLock(AnalyzeTableLockId)).isOkOr:
+      error "failed to release lock analyzeTable", error = error
+
+    debug "analyzeTable completed"
+
+    await sleepAsync(RunAnalyzeInterval)
+
+proc startAnalyzeTableLoop*(self: PostgresDriver) =
+  self.futLoopAnalyzeTable = self.analyzeTableLoop