diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index 4d2b179738f..fdfd0cb395d 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -14023,6 +14023,7 @@ int ha_innobase::truncate()
 
   const bool fts= error == DB_SUCCESS &&
     ib_table->flags2 & (DICT_TF2_FTS_HAS_DOC_ID | DICT_TF2_FTS);
+  const bool pause_purge= error == DB_SUCCESS && ib_table->get_ref_count() > 1;
 
   if (fts)
   {
@@ -14030,6 +14031,8 @@ int ha_innobase::truncate()
     purge_sys.stop_FTS(*ib_table);
     error= fts_lock_tables(trx, *ib_table);
   }
+  else if (pause_purge)
+    purge_sys.stop_FTS();
 
   /* Wait for purge threads to stop using the table. */
   for (uint n = 15; ib_table->get_ref_count() > 1; )
diff --git a/storage/innobase/handler/handler0alter.cc b/storage/innobase/handler/handler0alter.cc
index 09c1febf61d..3fe02af5beb 100644
--- a/storage/innobase/handler/handler0alter.cc
+++ b/storage/innobase/handler/handler0alter.cc
@@ -6603,8 +6603,9 @@ prepare_inplace_alter_table_dict(
 		mem_heap_alloc(ctx->heap, ctx->num_to_add_index
 			       * sizeof *ctx->add_key_numbers));
 
-	const bool fts_exist = ctx->new_table->flags2
+	const bool have_fts = user_table->flags2
 		& (DICT_TF2_FTS_HAS_DOC_ID | DICT_TF2_FTS);
+	const bool pause_purge = have_fts || user_table->get_ref_count() > 1;
 	/* Acquire a lock on the table before creating any indexes. */
 	bool table_lock_failed = false;
 
@@ -6631,13 +6632,18 @@ acquire_lock:
 		user_table->lock_shared_unlock();
 	}
 
-	if (fts_exist) {
-		purge_sys.stop_FTS(*ctx->new_table);
+	if (pause_purge) {
+		purge_sys.stop_FTS();
+		if (have_fts) {
+			purge_sys.stop_FTS(*user_table, true);
+		}
 		if (error == DB_SUCCESS) {
-			error = fts_lock_tables(ctx->trx, *ctx->new_table);
+			error = fts_lock_tables(ctx->trx, *user_table);
 		}
 	}
 
+	ut_ad(user_table->get_ref_count() == 1);
+
 	if (error == DB_SUCCESS) {
 		error = lock_sys_tables(ctx->trx);
 	}
@@ -7470,7 +7476,7 @@ error_handling_drop_uncached:
 		/* fts_create_common_tables() may drop old common tables,
 		whose files would be deleted here. */
 		commit_unlock_and_unlink(ctx->trx);
-		if (fts_exist) {
+		if (pause_purge) {
 			purge_sys.resume_FTS();
 		}
 
@@ -7566,7 +7572,7 @@ err_exit:
 		ctx->trx->free();
 	}
 	trx_commit_for_mysql(ctx->prebuilt->trx);
-	if (fts_exist) {
+	if (pause_purge) {
 		purge_sys.resume_FTS();
 	}
 
diff --git a/storage/innobase/trx/trx0purge.cc b/storage/innobase/trx/trx0purge.cc
index ef85dd7dbda..8292bb063b4 100644
--- a/storage/innobase/trx/trx0purge.cc
+++ b/storage/innobase/trx/trx0purge.cc
@@ -1292,8 +1292,6 @@ static purge_sys_t::iterator trx_purge_attach_undo_recs(THD *thd,
       break;
   }
 
-  purge_sys.m_active= false;
-
 #ifdef UNIV_DEBUG
   thr= UT_LIST_GET_FIRST(purge_sys.query->thrs);
   for (ulint i= 0; thr && i < *n_work_items;
@@ -1342,6 +1340,8 @@ static void trx_purge_wait_for_workers_to_complete()
 TRANSACTIONAL_INLINE
 void purge_sys_t::batch_cleanup(const purge_sys_t::iterator &head)
 {
+  m_active= false;
+
   /* Release the undo pages. */
   for (auto p : pages)
     p.second->unfix();