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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 5e6ab1c16d..072a5337a5 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -568,7 +568,8 @@ module ActiveRecord
end
def max_allowed_packet
- @max_allowed_packet ||= show_variable("max_allowed_packet")
+ bytes_margin = 2
+ @max_allowed_packet ||= (show_variable("max_allowed_packet") - bytes_margin)
end
def with_multi_statements