如何读懂SQL PROFILE 里产生的　HINT 内容？

ZALBB · 发表于 2017-12-12 16:22

ORACLE 11204

如下：该怎么读懂，理解？，另外，这些查询块名："SEL$B36B0BBB" 是系统自动产生的？还是有规律可寻的？

<other_xml><info type="db_version">11.2.0.4</info><info type="parse_schema">
<![CDATA["KDSA918"]]></info><info type="plan_hash">816910263</info><info type="plan_hash_2">2006300514</info><outline_data><hint>
<![CDATA[SEMI_TO_INNER(@"SEL$0C3D91C8" "KOKBF$0"@"SEL$5")]]></hint><hint>
<![CDATA[USE_NL(@"SEL$0C3D91C8" "A"@"SEL$1")]]></hint><hint><![CDATA[USE_NL(@"SEL$0C3D91C8" "B"@"SEL$1")]]>
</hint><hint><![CDATA[LEADING(@"SEL$0C3D91C8" "KOKBF$0"@"SEL$5" "B"@"SEL$1" "A"@"SEL$1")]]>
</hint><hint><![CDATA[INDEX(@"SEL$0C3D91C8" "A"@"SEL$1" ("T_PRD_MO"."FID"))]]>
</hint><hint><![CDATA[INDEX_RS_ASC(@"SEL$0C3D91C8" "B"@"SEL$1" ("T_PRD_MOENTRY"."FENTRYID"))]]>
</hint><hint><![CDATA[FULL(@"SEL$0C3D91C8" "KOKBF$0"@"SEL$5")]]></hint><hint>
<![CDATA[SEMI_TO_INNER(@"SEL$B36B0BBB" "VW_SQ_1"@"SEL$A2158E8A")]]></hint><hint>
<![CDATA[USE_NL(@"SEL$B36B0BBB" "T_CB_PROORDERDIME"@"DEL$1")]]></hint><hint><![CDATA[LEADING(@"SEL$B36B0BBB" "VW_SQ_1"@"SEL$A2158E8A" "T_CB_PROORDERDIME"@"DEL$1")]]>
</hint><hint><![CDATA[INDEX(@"SEL$B36B0BBB" "T_CB_PROORDERDIME"@"DEL$1" ("T_CB_PROORDERDIME"."FFORMID" "T_CB_PROORDERDIME"."FBILLENTRYID"))]]>
</hint><hint><![CDATA[NO_ACCESS(@"SEL$B36B0BBB" "VW_SQ_1"@"SEL$A2158E8A")]]></hint><hint><![CDATA[OUTLINE(@"SEL$5")]]>
</hint><hint><![CDATA[OUTLINE(@"SEL$4")]]></hint><hint><![CDATA[MERGE(@"SEL$5")]]></hint><hint><![CDATA[OUTLINE(@"SEL$7286615E")]]></hint><hint>
<![CDATA[OUTLINE(@"SEL$3")]]></hint><hint><![CDATA[OUTLINE(@"SEL$1")]]></hint><hint><![CDATA[OUTLINE(@"SEL$2")]]></hint><hint><![CDATA[OUTLINE(@"DEL$1")]]></hint><hint>
<![CDATA[MERGE(@"SEL$7286615E")]]></hint><hint><![CDATA[OUTLINE(@"SEL$C8360722")]]></hint><hint><![CDATA[MERGE(@"SEL$1")]]></hint><hint>
<![CDATA[OUTLINE(@"SEL$58A6D7F6")]]></hint><hint><![CDATA[OUTLINE(@"SEL$A2158E8A")]]></hint><hint><![CDATA[UNNEST(@"SEL$C8360722")]]>
</hint><hint><![CDATA[OUTLINE(@"SEL$74E21A19")]]></hint><hint><![CDATA[UNNEST(@"SEL$74E21A19")]]></hint><hint>
<![CDATA[OUTLINE_LEAF(@"SEL$B36B0BBB")]]></hint><hint><![CDATA[OUTLINE_LEAF(@"SEL$0C3D91C8")]]></hint><hint><![CDATA[NO_COST_XML_QUERY_REWRITE]]>
</hint><hint><![CDATA[XMLINDEX_REWRITE_IN_SELECT]]></hint><hint><![CDATA[XMLINDEX_REWRITE]]></hint><hint><![CDATA[XML_DML_RWT_STMT]]>
</hint><hint><![CDATA[FORCE_XML_QUERY_REWRITE]]></hint><hint><![CDATA[ALL_ROWS]]></hint><hint><![CDATA[OPT_PARAM('optimizer_index_caching' 90)]]>
</hint><hint><![CDATA[OPT_PARAM('optimizer_index_cost_adj' 50)]]></hint><hint><![CDATA[OPT_PARAM('_optimizer_use_feedback' 'false')]]></hint><hint>
<![CDATA[OPT_PARAM('_optimizer_adaptive_cursor_sharing' 'false')]]></hint><hint><![CDATA[OPT_PARAM('_optimizer_extended_cursor_sharing_rel' 'none')]]>
</hint><hint><![CDATA[OPT_PARAM('_pred_move_around' 'false')]]></hint><hint><![CDATA[DB_VERSION('11.2.0.4')]]></hint><hint>
<![CDATA[OPTIMIZER_FEATURES_ENABLE('11.2.0.4')]]></hint><hint><![CDATA[IGNORE_OPTIM_EMBEDDED_HINTS]]></hint></outline_data></other_xml>