{"id":155381,"date":"2012-10-19T13:32:03","date_gmt":"2012-10-19T09:32:03","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=155381"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=155381","title":{"rendered":"<span class=\"post_title\">\u0412\u0430\u0436\u043d\u043e\u0441\u0442\u044c \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c \u043f\u0440\u0438 \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u0441\u0442\u0435\u043f\u0435\u043d\u0438 \u043d\u0435\u0440\u0430\u0432\u043d\u043e\u043c\u0435\u0440\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043b\u043e\u043d\u043a\u0435<\/span>"},"content":{"rendered":"<div class=\"content html_format\">   \t\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0432\u0430\u0436\u043d\u043e\u0441\u0442\u044c \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c \u043f\u043e \u043a\u043e\u043b\u043e\u043d\u043a\u0430\u043c \u0441 \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u0441\u0442\u0435\u043f\u0435\u043d\u044c \u043d\u0435\u0440\u0430\u0432\u043d\u043e\u043c\u0435\u0440\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043b\u043e\u043d\u043a\u0435.<br \/>  \u0412\u043e\u0437\u044c\u043c\u0435\u043c \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443 STG.TEST. \u0418\u043c\u0435\u0435\u0442\u0441\u044f \u043d\u0435\u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0438\u043d\u0434\u0435\u043a\u0441 TEST_I \u043f\u043e \u043f\u043e\u043b\u044e FIELD_ID.  <\/p>\n<pre><code class=\"sql\">select count(*) from stg.test ----------- 43756707  SQL&gt; desc stg.test; Name        Type          Nullable Default Comments  ----------- ------------- -------- ------- --------  NAME CHAR(2)                                  DAT   DATE                                     ID     NUMBER(12)    Y                          FIELD_ID    INTEGER                                  FIELD_VALUE VARCHAR2(100) Y <\/code><\/pre>\n<p>  \u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u043d\u0435\u043e\u0434\u043d\u043e\u0440\u043e\u0434\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043b\u043e\u043d\u043a\u0435 FIELD_ID \u2014 \u043f\u0440\u043e\u0430\u043f\u0434\u0435\u0439\u0442\u0438\u043c \u043a\u043e\u043b\u043e\u043d\u043a\u0443 FIELD_ID, \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u0432 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435=100 \u0438 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0440\u0443\u043a\u0430\u043c\u0438 \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u043c=103, 1000, 1002, 1003 (\u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430)<\/p>\n<p>  <a name=\"habracut\"><\/a><\/p>\n<p>  \u0421\u043e\u0431\u0435\u0440\u0435\u043c \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0443 \u043f\u043e \u0442\u0430\u0431\u043b\u0438\u0446\u0435, \u043d\u043e \u0443\u0434\u0430\u043b\u0438\u043c \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c\u0443:  <\/p>\n<pre><code class=\"sql\">begin   dbms_stats.gather_table_stats(ownname =&gt; 'stg',tabname =&gt; 'test',degree =&gt; 16,cascade =&gt; true,estimate_percent =&gt; 50);   dbms_stats.delete_column_stats(ownname =&gt; 'stg',tabname =&gt; 'test',colname =&gt; 'field_id'); end;   select table_name,num_rows,blocks,avg_row_len from dba_tables where table_name='TEST' and owner='STG' <\/code><\/pre>\n<table>\n<tr>\n<th>TABLE_NAME<\/th>\n<th>NUM_ROWS<\/th>\n<th>BLOCKS<\/th>\n<th>AVG_ROW_LEN<\/th>\n<\/tr>\n<tr>\n<td>TEST<\/td>\n<td>43756707<\/td>\n<td>302080<\/td>\n<td>44<\/td>\n<\/tr>\n<\/table>\n<p>  \u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u043f\u043b\u0430\u043d \u0438 \u0432\u0440\u0435\u043c\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043d\u0435\u0445\u0438\u0442\u0440\u043e\u0432\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430:  <\/p>\n<pre><code class=\"sql\">explain plan for select * from stg.test  t where subs_id in (select subs_id from stg.test b where b.field_id=103 and b.rowid=t.rowid)  Plan hash value: 1839037834 ----------------------------------------------------------------------------------------------- | Id  | Operation                    | Name   | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | ----------------------------------------------------------------------------------------------- |   0 | SELECT STATEMENT             |        |     1 |    75 |       |   209K  (1)| 00:41:53 | |*  1 |  HASH JOIN                   |        |     1 |    75 |    17M|   209K  (1)| 00:41:53 | |   2 |   TABLE ACCESS BY INDEX ROWID| TEST   |   437K|    12M|       |  9408   (1)| 00:01:53 | |*  3 |    INDEX RANGE SCAN          | TEST_I |   175K|       |       |  7851   (1)| 00:01:35 | |   4 |   TABLE ACCESS FULL          | TEST   |    43M|  1836M|       | 82685   (2)| 00:16:33 | -----------------------------------------------------------------------------------------------   SQL&gt; select count(*) from stg.test  t   2  where subs_id in   3  (select subs_id from stg.test b where b.field_id=103 and b.rowid=t.rowid);        COUNT(*) ----------          4   Executed in 11,513 seconds <\/code><\/pre>\n<p>  \u041a\u0430\u043a \u0432\u0438\u0434\u0438\u043c, \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0442\u043e\u0440 \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u0442 HASH JOIN \u0437\u0430\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u044f\u0441\u044c \u043d\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0434\u0432\u0443\u0445 \u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043e\u0431\u044a\u0435\u043c\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445, \u0445\u043e\u0442\u044f \u0432 \u0437\u0430\u043f\u0440\u043e\u0441\u0435 \u043c\u044b \u0443\u043a\u0430\u0437\u0430\u043b\u0438 \u0435\u043c\u0443 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u044e\u0449\u0435\u0435\u0441\u044f \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 1-2 \u0440\u0430\u0437\u0430. \u041f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u043e\u0441\u043b\u0435 3-4 \u0440\u0430\u0437\u0430, \u0434\u0430\u0431\u044b \u0443\u0447\u0435\u0441\u0442\u044c \u0440\u0430\u0437\u043e\u0433\u0440\u0435\u0432\u0430\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u043d\u043e\u0433\u043e \u043a\u0435\u0448\u0430.<br \/>  \u041f\u0435\u0440\u0435\u0441\u043e\u0431\u0435\u0440\u0435\u043c \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0443 \u043d\u0435 \u0443\u0434\u0430\u043b\u044f\u044f \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c\u0443  <\/p>\n<pre><code class=\"sql\"> begin   dbms_stats.gather_table_stats(ownname =&gt; 'stg',tabname =&gt; 'test',degree =&gt; 16,cascade =&gt; true, estimate_percent =&gt; 50); end;    <\/code><\/pre>\n<p>  \u041f\u0440\u043e\u0432\u0435\u0440\u0438\u043c \u0435\u0451 \u043d\u0430\u043b\u0438\u0447\u0438\u0435:  <\/p>\n<pre><code class=\"sql\">select column_name,endpoint_number,endpoint_value from dba_tab_histograms where owner='STG' and table_name='TEST' and column_name='FIELD_ID' <\/code><\/pre>\n<p>  <\/p>\n<table>\n<tr>\n<th>COLUMN_NAME<\/th>\n<th>ENDPOINT_NUMBER<\/th>\n<th>ENDPOINT_VALUE<\/th>\n<\/tr>\n<tr>\n<td>FIELD_ID<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>FIELD_ID<\/td>\n<td>21875192<\/td>\n<td>100<\/td>\n<\/tr>\n<tr>\n<td>FIELD_ID<\/td>\n<td>21875195<\/td>\n<td>103<\/td>\n<\/tr>\n<tr>\n<td>FIELD_ID<\/td>\n<td>21875196<\/td>\n<td>1000<\/td>\n<\/tr>\n<tr>\n<td>FIELD_ID<\/td>\n<td>21875198<\/td>\n<td>1003<\/td>\n<\/tr>\n<\/table>\n<p>  \u041a\u0430\u043a \u0432\u0438\u0434\u0438\u043c, \u0438\u043c\u0435\u0435\u0442\u0441\u044f FREQUENCY \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c\u0430 (\u0447\u0442\u043e \u043b\u043e\u0433\u0438\u0447\u043d\u043e \u043f\u0440\u0438 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439) \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043e\u0441\u043d\u043e\u0432\u043d\u0430\u044f \u043c\u0430\u0441\u0441\u0430 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043d\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435=100.<br \/>  \u0412\u0437\u0433\u043b\u044f\u043d\u0435\u043c \u0442\u0435\u043f\u0435\u0440\u044c \u043d\u0430 \u0432\u0440\u0435\u043c\u044f \u0438 \u043f\u043b\u0430\u043d \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f:<\/p>\n<pre><code class=\"sql\">--------------------------------------------------------------------------------------- | Id  | Operation                    | Name   | Rows  | Bytes | Cost (%CPU)| Time     | --------------------------------------------------------------------------------------- |   0 | SELECT STATEMENT             |        |     1 |    66 |    10   (0)| 00:00:01 | |   1 |  NESTED LOOPS                |        |     1 |    66 |    10   (0)| 00:00:01 | |   2 |   TABLE ACCESS BY INDEX ROWID| TEST   |     6 |   132 |     4   (0)| 00:00:01 | |*  3 |    INDEX RANGE SCAN          | TEST_I |     6 |       |     3   (0)| 00:00:01 | |*  4 |   TABLE ACCESS BY USER ROWID | TEST   |     1 |    44 |     1   (0)| 00:00:01 | ---------------------------------------------------------------------------------------   SQL&gt; alter system flush shared_pool;   System altered   Executed in 0,046 seconds   SQL&gt; alter system flush buffer_cache;   System altered   Executed in 0,39 seconds  SQL&gt; select count(*) from stg.test  t   2  where subs_id in   3  (select subs_id from stg.test b where b.field_id=103 and b.rowid=t.rowid);     COUNT(*) ----------          4   Executed in 0,047 seconds <\/code><\/pre>\n<p>  \u041d\u0430 \u044d\u0442\u043e\u0442 \u0440\u0430\u0437 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0442\u043e\u0440 \u0443\u0436\u0435 \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u0442 \u0431\u043e\u043b\u0435\u0435 \u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0439 \u0432 \u0434\u0430\u043d\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 NESTED_LOOPS \u0442\u0430\u043a \u043a\u0430\u043a \u0437\u043d\u0430\u0435\u0442, \u0447\u0442\u043e \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u0435\u043c\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u043d\u0435\u0432\u0435\u043b\u0438\u043a\u0438. \u0427\u0442\u043e, \u0432 \u0438\u0442\u043e\u0433\u0435, \u0431\u043b\u0430\u0433\u043e\u0442\u0432\u043e\u0440\u043d\u043e \u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u0434\u0430\u0436\u0435 \u043f\u0440\u0438 \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u0447\u0438\u0449\u0435\u043d\u043d\u044b\u0445 \u043f\u0443\u043b\u0430\u0445.    \t   \t<\/p>\n<div class=\"clear\"><\/div>\n<\/p><\/div>\n<p> \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 <a href=\"http:\/\/habrahabr.ru\/post\/155381\/\"> http:\/\/habrahabr.ru\/post\/155381\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"content html_format\">   \t\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0432\u0430\u0436\u043d\u043e\u0441\u0442\u044c \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0433\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u043c \u043f\u043e \u043a\u043e\u043b\u043e\u043d\u043a\u0430\u043c \u0441 \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u0441\u0442\u0435\u043f\u0435\u043d\u044c \u043d\u0435\u0440\u0430\u0432\u043d\u043e\u043c\u0435\u0440\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043b\u043e\u043d\u043a\u0435.<br \/>  \u0412\u043e\u0437\u044c\u043c\u0435\u043c \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443 STG.TEST. \u0418\u043c\u0435\u0435\u0442\u0441\u044f \u043d\u0435\u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0438\u043d\u0434\u0435\u043a\u0441 TEST_I \u043f\u043e \u043f\u043e\u043b\u044e FIELD_ID.  <\/p>\n<pre><code class=\"sql\">select count(*) from stg.test ----------- 43756707  SQL&gt; desc stg.test; Name        Type          Nullable Default Comments  ----------- ------------- -------- ------- --------  NAME CHAR(2)                                  DAT   DATE                                     ID     NUMBER(12)    Y                          FIELD_ID    INTEGER                                  FIELD_VALUE VARCHAR2(100) Y <\/code><\/pre>\n<p>  \u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u043d\u0435\u043e\u0434\u043d\u043e\u0440\u043e\u0434\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043b\u043e\u043d\u043a\u0435 FIELD_ID \u2014 \u043f\u0440\u043e\u0430\u043f\u0434\u0435\u0439\u0442\u0438\u043c \u043a\u043e\u043b\u043e\u043d\u043a\u0443 FIELD_ID, \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u0432 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435=100 \u0438 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0440\u0443\u043a\u0430\u043c\u0438 \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u043c=103, 1000, 1002, 1003 (\u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430)<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-155381","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/155381","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=155381"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/155381\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155381"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}