Document auto_explain.log_timing.

Tomas Vondra

diff --git a/doc/src/sgml/auto-explain.sgml b/doc/src/sgml/auto-explain.sgml
index 8325f0371d1c18f9eb46e84329a243d10b143f8e..03b2309da8f99bf54b2a71af4d3172e14e349f84 100644 (file)
--- a/doc/src/sgml/auto-explain.sgml
+++ b/doc/src/sgml/auto-explain.sgml
@@ -139,6 +139,27 @@ LOAD 'auto_explain';
     
    
 
+   
+    
+     auto_explain.log_timing (boolean)
+    
+    
+     auto_explain.log_timing configuration parameter
+    
+    
+     
+      auto_explain.log_timing causes EXPLAIN
+      (ANALYZE, TIMING off) output, rather than just EXPLAIN (ANALYZE)
+      output. The overhead of repeatedly reading the system clock can slow down the
+      query significantly on some systems, so it may be useful to set this
+      parameter to FALSE when only actual row counts, and not
+      exact times, are needed.
+      This parameter is only effective when auto_explain.log_analyze
+      is also enabled.  It defaults to TRUE.
+     
+    
+   
+   
    
     
      auto_explain.log_nested_statements (boolean)