staticboolauto_explain_log_timing= true;

staticintauto_explain_log_format=EXPLAIN_FORMAT_TEXT;

staticboolauto_explain_log_nested_statements= false;

staticdoubleauto_explain_sample_ratio=1;

staticdoubleauto_explain_sample_rate=1;

staticconststructconfig_enum_entryformat_options[]= {

{"text",EXPLAIN_FORMAT_TEXT, false},

NULL,

NULL);

DefineCustomRealVariable("auto_explain.sample_ratio",

DefineCustomRealVariable("auto_explain.sample_rate",

"Fraction of queries to process.",

NULL,

&auto_explain_sample_ratio,

&auto_explain_sample_rate,

1.0,

0.0,

1.0,

explain_ExecutorStart(QueryDesc*queryDesc,inteflags)

{

if (auto_explain_log_min_duration >=0&&nesting_level==0)

current_query_sampled= (random()<auto_explain_sample_ratio*

current_query_sampled= (random()<auto_explain_sample_rate*

MAX_RANDOM_VALUE);

if (auto_explain_enabled()&&current_query_sampled)

<varlistentry>

<term>

<varname>auto_explain.sample_ratio</varname> (<type>real</type>)

<varname>auto_explain.sample_rate</varname> (<type>real</type>)

<indexterm>

<primary><varname>auto_explain.sample_ratio</> configuration parameter</primary>

<primary><varname>auto_explain.sample_rate</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

<varname>auto_explain.sample_ratio</varname> (<type>floating point</type>)

causes auto_explain to only explain a fraction of the statements in each

session. The default is 1, meaning explain all the queries. In case

of nested statements, either all will be explained or none. Only

superusers can change this setting.

<varname>auto_explain.sample_rate</varname> causes auto_explain to only

explain a fraction of the statements in each session. The default is 1,

meaning explain all the queries. In case of nested statements, either all

will be explained or none. Only superusers can change this setting.

</para>

</listitem>

</varlistentry>