diff --git a/docs/generated/sql/bnf/BUILD.bazel b/docs/generated/sql/bnf/BUILD.bazel
index d7929f5b2c17..daefe23eca80 100644
--- a/docs/generated/sql/bnf/BUILD.bazel
+++ b/docs/generated/sql/bnf/BUILD.bazel
@@ -68,7 +68,6 @@ FILES = [
     "alter_zone_table_stmt",
     "analyze_stmt",
     "backup",
-    "begin_stmt",
     "begin_transaction",
     "cancel_all_jobs_stmt",
     "cancel_job",
@@ -153,6 +152,7 @@ FILES = [
     "like_table_option_list",
     "limit_clause",
     "move_cursor_stmt",
+    "nonpreparable_set_stmt",
     "not_null_column_level",
     "offset_clause",
     "on_conflict",
@@ -206,7 +206,6 @@ FILES = [
     "set_rest_more",
     "set_session_stmt",
     "set_transaction",
-    "set_transaction_stmt",
     "show_backup",
     "show_cluster_setting",
     "show_columns_stmt",
diff --git a/docs/generated/sql/bnf/begin_stmt.bnf b/docs/generated/sql/bnf/begin_stmt.bnf
deleted file mode 100644
index 1059df25a0ad..000000000000
--- a/docs/generated/sql/bnf/begin_stmt.bnf
+++ /dev/null
@@ -1 +0,0 @@
-begin_stmt ::=
diff --git a/docs/generated/sql/bnf/legacy_begin_stmt.bnf b/docs/generated/sql/bnf/legacy_begin_stmt.bnf
index 3974be960389..da259cc1e014 100644
--- a/docs/generated/sql/bnf/legacy_begin_stmt.bnf
+++ b/docs/generated/sql/bnf/legacy_begin_stmt.bnf
@@ -1,2 +1,19 @@
 legacy_begin_stmt ::=
-	'BEGIN' opt_transaction begin_transaction
+	'BEGIN' 'TRANSACTION' 'PRIORITY' 'LOW' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'PRIORITY' 'NORMAL' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'PRIORITY' 'HIGH' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'READ' 'ONLY' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'READ' 'WRITE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'DEFERRABLE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 'NOT' 'DEFERRABLE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN' 'TRANSACTION' 
+	| 'BEGIN'  'PRIORITY' 'LOW' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'PRIORITY' 'NORMAL' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'PRIORITY' 'HIGH' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'READ' 'ONLY' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'READ' 'WRITE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'AS' 'OF' 'SYSTEM' 'TIME' a_expr ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'DEFERRABLE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  'NOT' 'DEFERRABLE' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
+	| 'BEGIN'  
diff --git a/docs/generated/sql/bnf/nonpreparable_set_stmt.bnf b/docs/generated/sql/bnf/nonpreparable_set_stmt.bnf
new file mode 100644
index 000000000000..c0cd7be13d8b
--- /dev/null
+++ b/docs/generated/sql/bnf/nonpreparable_set_stmt.bnf
@@ -0,0 +1,2 @@
+nonpreparable_set_stmt ::=
+	set_transaction_stmt
diff --git a/docs/generated/sql/bnf/set_transaction.bnf b/docs/generated/sql/bnf/set_transaction.bnf
index 24f8f21d7433..973dde2b78ba 100644
--- a/docs/generated/sql/bnf/set_transaction.bnf
+++ b/docs/generated/sql/bnf/set_transaction.bnf
@@ -1,4 +1,4 @@
-nonpreparable_set_stmt ::=
+set_transaction_stmt ::=
 	'SET' 'TRANSACTION' 'PRIORITY' 'LOW' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
 	| 'SET' 'TRANSACTION' 'PRIORITY' 'NORMAL' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
 	| 'SET' 'TRANSACTION' 'PRIORITY' 'HIGH' ( ( ( ',' |  ) ( ( 'PRIORITY' ( 'LOW' | 'NORMAL' | 'HIGH' ) ) | ( 'READ' 'ONLY' | 'READ' 'WRITE' ) | ( 'AS' 'OF' 'SYSTEM' 'TIME' a_expr ) | ( 'DEFERRABLE' | 'NOT' 'DEFERRABLE' ) ) ) )*
diff --git a/docs/generated/sql/bnf/set_transaction_stmt.bnf b/docs/generated/sql/bnf/set_transaction_stmt.bnf
deleted file mode 100644
index 3ce95cb05c13..000000000000
--- a/docs/generated/sql/bnf/set_transaction_stmt.bnf
+++ /dev/null
@@ -1,3 +0,0 @@
-set_transaction_stmt ::=
-	'SET' 'TRANSACTION' transaction_mode_list
-	| 'SET' 'SESSION' 'TRANSACTION' transaction_mode_list
diff --git a/pkg/cmd/docgen/diagrams.go b/pkg/cmd/docgen/diagrams.go
index 32f507f01fa4..850cdf0a407a 100644
--- a/pkg/cmd/docgen/diagrams.go
+++ b/pkg/cmd/docgen/diagrams.go
@@ -615,7 +615,7 @@ var specs = []stmtSpec{
 		exclude: []*regexp.Regexp{regexp.MustCompile("'IN'")},
 	},
 	{
-		name: "begin_stmt",
+		name: "legacy_begin_stmt",
 		inline: []string{
 			"opt_transaction",
 			"begin_transaction",
@@ -628,9 +628,7 @@ var specs = []stmtSpec{
 			"transaction_read_mode",
 			"as_of_clause",
 			"transaction_deferrable_mode",
-		},
-		exclude: []*regexp.Regexp{
-			regexp.MustCompile("'START'"),
+			"user_priority",
 		},
 	},
 	{
@@ -1320,7 +1318,7 @@ var specs = []stmtSpec{
 	},
 	{
 		name: "set_transaction",
-		stmt: "nonpreparable_set_stmt",
+		stmt: "set_transaction_stmt",
 		inline: []string{
 			"set_transaction_stmt",
 			"transaction_mode",
diff --git a/pkg/gen/bnf.bzl b/pkg/gen/bnf.bzl
index ad605d3f3dd8..24fd65c3e6cc 100644
--- a/pkg/gen/bnf.bzl
+++ b/pkg/gen/bnf.bzl
@@ -68,7 +68,6 @@ BNF_SRCS = [
   "//docs/generated/sql/bnf:alter_zone_table_stmt.bnf",
   "//docs/generated/sql/bnf:analyze_stmt.bnf",
   "//docs/generated/sql/bnf:backup.bnf",
-  "//docs/generated/sql/bnf:begin_stmt.bnf",
   "//docs/generated/sql/bnf:begin_transaction.bnf",
   "//docs/generated/sql/bnf:cancel_all_jobs_stmt.bnf",
   "//docs/generated/sql/bnf:cancel_job.bnf",
@@ -153,6 +152,7 @@ BNF_SRCS = [
   "//docs/generated/sql/bnf:like_table_option_list.bnf",
   "//docs/generated/sql/bnf:limit_clause.bnf",
   "//docs/generated/sql/bnf:move_cursor_stmt.bnf",
+  "//docs/generated/sql/bnf:nonpreparable_set_stmt.bnf",
   "//docs/generated/sql/bnf:not_null_column_level.bnf",
   "//docs/generated/sql/bnf:offset_clause.bnf",
   "//docs/generated/sql/bnf:on_conflict.bnf",
@@ -206,7 +206,6 @@ BNF_SRCS = [
   "//docs/generated/sql/bnf:set_rest_more.bnf",
   "//docs/generated/sql/bnf:set_session_stmt.bnf",
   "//docs/generated/sql/bnf:set_transaction.bnf",
-  "//docs/generated/sql/bnf:set_transaction_stmt.bnf",
   "//docs/generated/sql/bnf:show_backup.bnf",
   "//docs/generated/sql/bnf:show_cluster_setting.bnf",
   "//docs/generated/sql/bnf:show_columns_stmt.bnf",
diff --git a/pkg/gen/diagrams.bzl b/pkg/gen/diagrams.bzl
index 331a9a11ac03..9e7d8a5143bd 100644
--- a/pkg/gen/diagrams.bzl
+++ b/pkg/gen/diagrams.bzl
@@ -68,7 +68,6 @@ DIAGRAMS_SRCS = [
   "//docs/generated/sql/bnf:alter_zone_table.html",
   "//docs/generated/sql/bnf:analyze.html",
   "//docs/generated/sql/bnf:backup.html",
-  "//docs/generated/sql/bnf:begin.html",
   "//docs/generated/sql/bnf:begin_transaction.html",
   "//docs/generated/sql/bnf:cancel.html",
   "//docs/generated/sql/bnf:cancel_all_jobs.html",
@@ -153,6 +152,7 @@ DIAGRAMS_SRCS = [
   "//docs/generated/sql/bnf:like_table_option_list.html",
   "//docs/generated/sql/bnf:limit_clause.html",
   "//docs/generated/sql/bnf:move_cursor.html",
+  "//docs/generated/sql/bnf:nonpreparable_set.html",
   "//docs/generated/sql/bnf:not_null_column_level.html",
   "//docs/generated/sql/bnf:offset_clause.html",
   "//docs/generated/sql/bnf:on_conflict.html",
diff --git a/pkg/gen/docs.bzl b/pkg/gen/docs.bzl
index 3b89e7dfe9a4..03688c9753cc 100644
--- a/pkg/gen/docs.bzl
+++ b/pkg/gen/docs.bzl
@@ -80,7 +80,6 @@ DOCS_SRCS = [
   "//docs/generated/sql/bnf:alter_zone_table_stmt.bnf",
   "//docs/generated/sql/bnf:analyze_stmt.bnf",
   "//docs/generated/sql/bnf:backup.bnf",
-  "//docs/generated/sql/bnf:begin_stmt.bnf",
   "//docs/generated/sql/bnf:begin_transaction.bnf",
   "//docs/generated/sql/bnf:cancel_all_jobs_stmt.bnf",
   "//docs/generated/sql/bnf:cancel_job.bnf",
@@ -165,6 +164,7 @@ DOCS_SRCS = [
   "//docs/generated/sql/bnf:like_table_option_list.bnf",
   "//docs/generated/sql/bnf:limit_clause.bnf",
   "//docs/generated/sql/bnf:move_cursor_stmt.bnf",
+  "//docs/generated/sql/bnf:nonpreparable_set_stmt.bnf",
   "//docs/generated/sql/bnf:not_null_column_level.bnf",
   "//docs/generated/sql/bnf:offset_clause.bnf",
   "//docs/generated/sql/bnf:on_conflict.bnf",
@@ -218,7 +218,6 @@ DOCS_SRCS = [
   "//docs/generated/sql/bnf:set_rest_more.bnf",
   "//docs/generated/sql/bnf:set_session_stmt.bnf",
   "//docs/generated/sql/bnf:set_transaction.bnf",
-  "//docs/generated/sql/bnf:set_transaction_stmt.bnf",
   "//docs/generated/sql/bnf:show_backup.bnf",
   "//docs/generated/sql/bnf:show_cluster_setting.bnf",
   "//docs/generated/sql/bnf:show_columns_stmt.bnf",