diff --git a/.gitignore b/.gitignore
index 1d6ff5e..8aeed57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ pkg
 log
 tmp
 sqlnet.log
+debug.log
 Gemfile.lock
 *.zip
 .idea
diff --git a/Gemfile b/Gemfile
index 85d1363..58fe003 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,6 +14,7 @@ end
 group :test, :development do
   gem "rake", ">= 10.0"
   gem "rspec", "~> 3.1"
+  gem "logger"
 
   unless ENV["NO_ACTIVERECORD"]
     gem "activerecord", github: "rails/rails", branch: "main"
diff --git a/spec/support/sql_logger.rb b/spec/support/sql_logger.rb
new file mode 100644
index 0000000..59bbbaf
--- /dev/null
+++ b/spec/support/sql_logger.rb
@@ -0,0 +1,33 @@
+# Always write SQL executed during the spec run to debug.log.
+# Logger args mirror activerecord-oracle_enhanced-adapter's spec logger
+# (shift_age, shift_size) so debug.log behaves the same way.
+require "logger"
+
+PLSQL_DEBUG_LOGGER = Logger.new("debug.log", 0, 100 * 1024 * 1024)
+PLSQL_DEBUG_LOGGER.formatter = ->(_sev, time, _prog, msg) {
+  "#{time.iso8601(6)}  #{msg}\n"
+}
+
+module PLSQLSQLLogger
+  def exec(sql, *bindvars)
+    PLSQL_DEBUG_LOGGER.info("EXEC   #{sql.strip}#{bindvars.empty? ? '' : "  BINDS=#{bindvars.inspect}"}")
+    super
+  end
+
+  def cursor_from_query(sql, bindvars = [], options = {})
+    PLSQL_DEBUG_LOGGER.info("QUERY  #{sql.strip}#{bindvars.empty? ? '' : "  BINDS=#{bindvars.inspect}"}")
+    super
+  end
+
+  def parse(sql)
+    PLSQL_DEBUG_LOGGER.info("PARSE  #{sql.strip}")
+    super
+  end
+end
+
+PLSQL::OCIConnection.prepend(PLSQLSQLLogger)  if defined?(PLSQL::OCIConnection)
+PLSQL::JDBCConnection.prepend(PLSQLSQLLogger) if defined?(PLSQL::JDBCConnection)
+
+if defined?(ActiveRecord::Base)
+  ActiveRecord::Base.logger = PLSQL_DEBUG_LOGGER
+end