{"id":1301,"date":"2016-03-22T07:21:40","date_gmt":"2016-03-22T07:21:40","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=1301"},"modified":"2016-03-22T07:21:40","modified_gmt":"2016-03-22T07:21:40","slug":"analyze-%ec%99%80-dbmsstats-%ed%86%b5%ea%b3%84-%ec%a0%95%eb%b3%b4-%ec%88%98%ec%a7%91-%ec%9d%98-%ec%b0%a8%ec%9d%b4","status":"publish","type":"post","link":"https:\/\/haisins.synology.me\/wordpress\/?p=1301","title":{"rendered":"Analyze \uc640 DBMS_STATS \ud1b5\uacc4 \uc815\ubcf4 \uc218\uc9d1 \uc758 \ucc28\uc774"},"content":{"rendered":"

 <\/span><\/p>\n

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 Analyze\ub294 Serial Statistics Gathering \uae30\ub2a5 , DBMS_STATS\uc740 Parallel Gathering \uae30\ub2a5<\/span><\/p>\n

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1. Analyze\ub294 \ud30c\ud2f0\uc158\uc758 \ud1b5\uacc4\uc815\ubcf4\ub97c \uac01 \ud30c\ud2f0\uc158 \ud14c\uc774\ube14\uacfc \uc778\ub371\uc2a4\uc5d0 \ub300\ud574\uc11c \uc218\uc9d1\ud558\uace0, Global Statistics\ub294 <\/span>\ud30c\ud2f0\uc158 \uc815\ubcf4\ub97c \uac00\uc9c0\uace0 \uacc4\uc0b0\ud558\ubbc0\ub85c, \ube44\uc815\ud655\ud560 \uc218 \uc788\ub2e4. <\/span>\uadf8\ub7ec\ubbc0\ub85c \ud30c\ud2f0\uc158 \ub610\ub294 \uc11c\ube0c\ud30c\ud2f0\uc158\uc774 \uc788\ub294 \uac1d\uccb4\uc5d0\ub294 DBMS_STATS\uc744 \uc0ac\uc6a9 \ud574\uc57c \ud568. <\/span><\/p>\n

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2. DBMS_STATS\uc740 \uc804\uccb4 \ud074\ub7ec\uc2a4\ud130\uc5d0 \ub300\ud574\uc11c\ub294 \ud1b5\uacc4\uc815\ubcf4\ub97c \uc218\uc9d1\ud558\uc9c0 \uc54a\uc73c\ubbc0\ub85c Analyze\ub97c \uc0ac\uc6a9<\/span><\/p>\n

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3. DBMS_STATS\uc740 CBO\uc640 \uad00\ub828\ub41c \ud1b5\uacc4\uc815\ubcf4\ub9cc\uc744 \uc218\uc9d1\ud55c\ub2e4. \ud14c\uc774\ube14\uc758 EMPTY_BLOCKS, AVG_SPACE,CHAIN_CNT \ub4f1\uc740 <\/span>\uc218\uc9d1\ub418\uc9c0 \uc54a\ub294\ub2e4. <\/span><\/p>\n

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4. DBMS_STATS\uc740 \uc0ac\uc6a9\uc790\uac00 \uc9c0\uc815\ud55c \ud1b5\uacc4\uc815\ubcf4 \ud14c\uc774\ube14\uc5d0 \uc218\uc9d1\ub41c \ud1b5\uacc4\uc815\ubcf4\ub97c \uc800\uc7a5\ud560\uc218\uc788\uace0, \ub515\uc154\ub108\ub9ac\ub85c \uac01 \uce7c\ub7fc, \ud14c\uc774\ube14, <\/span>\uc778\ub371\uc2a4, \uc2a4\ud0a4\ub9c8\ub4f1\uc744 \ubc18\uc601\ud560\uc218\uc788\ub2e4. <\/span><\/p>\n

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5. DBMS_STATS\uc740 IMPORT\/EXPORT \uae30\ub2a5 \ubc0f \ucd94\uac00\uc801\uc778 \uae30\ub2a5\uc774 \ub9ce\ub2e4. <\/span>\uc774 \uae30\ub2a5 \uc744 \uc774\uc6a9\ud558\uc5ec \uc6b4\uc601 DB\uc758 \ud1b5\uacc4\uc815\ubcf4\ub97c \uac1c\ubc1c\uc7a5\ube44\uc758 \ud1b5\uacc4\uc815\ubcf4\ub85c \ubcf5\uc0ac\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uac1c\ubc1c\uc7a5\ube44\uc758 \ud50c\ub79c\uc744 <\/span>\uc6b4\uc601\uc7a5\ube44\uc640 \uac19\uac8c \ub9cc\ub4e4 \uc218 \uc788\ub2e4. <\/span><\/p>\n

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\ub2e4\uc74c\uc740 Analyze \uba85\ub839\uc5b4\uc5d0\ub9cc \uc788\ub294 \uae30\ub2a5\uc774\ub2e4. <\/span><\/p>\n

Structural Integrity Check \uae30\ub2a5 <\/span><\/p>\n

analyze { index\/table\/cluster } (schema.){ index\/table\/cluster } validate structure (cascade) (into schema.table); <\/span><\/p>\n

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Chained Rows \uc218\uc9d1 \uae30\ub2a5 <\/span><\/p>\n

ANALYZE TABLE order_hist LIST CHAINED ROWS INTO ;<\/span><\/p>\n

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————————————————————————-<\/span><\/p>\n

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\uacb0\ub860: analyze \uc9c1\ud6c4 dbms_stats\ud558\uba74 admin stat\uacfc optimizer stat\uc774 \uc81c\ub300\ub85c merge\ub428.<\/span><\/p>\n

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drop table  blueone;<\/span><\/p>\n

create table  blueone<\/span><\/p>\n

pctfree 5<\/span><\/p>\n

storage( initial 1M next 1M pctincrease 0 )<\/span><\/p>\n

partition by range (object_type)<\/span><\/p>\n

       (partition  pt  values less than (‘U’),<\/span><\/p>\n

        partition  pz  values less than (maxvalue)<\/span><\/p>\n

       )<\/span><\/p>\n

nologging<\/span><\/p>\n

as<\/span><\/p>\n

select *<\/span><\/p>\n

from  all_objects<\/span><\/p>\n

where rownum <= 10000<\/span><\/p>\n

;<\/span><\/p>\n

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update  blueone<\/span><\/p>\n

   set  SUBOBJECT_NAME = rpad(‘ ‘,30)<\/span><\/p>\n

;<\/span><\/p>\n

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commit;<\/span><\/p>\n

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analyze table blueone compute statistics;<\/span><\/p>\n

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col  “GLOBAL_STATS”              form a6        heading Global_|Stats<\/span><\/p>\n

col  “LAST_ANALYZED”             form a20       heading Last_Analyzed<\/span><\/p>\n

col  “TABLE_NAME”                form a10       heading Table_Name<\/span><\/p>\n

col  “USER_STATS”                form a6        heading User_|Stats<\/span><\/p>\n

col  “AVG_ROW_LEN”               form 9999      heading Avg_|Row_|Len<\/span><\/p>\n

col  “AVG_SPACE”                 form 9999      heading Avg_|Space<\/span><\/p>\n

col  “AVG_SPACE_FREELIST_BLOCKS” form 9999      heading Avg_|Space_|Freelist_|Blocks<\/span><\/p>\n

col  “BLOCKS”                    form 99999     heading Blocks<\/span><\/p>\n

col  “CHAIN_CNT”                 form 9999      heading Chain_|Cnt<\/span><\/p>\n

col  “EMPTY_BLOCKS”              form 9999      heading Empty_|Blocks<\/span><\/p>\n

col  “NUM_FREELIST_BLOCKS”       form 9999      heading Num_|Freelist_|Blocks<\/span><\/p>\n

col  “NUM_ROWS”                  form 99999999  heading Num_|Rows<\/span><\/p>\n

col  “SAMPLE_SIZE”               form 99999999  heading Sample_|Size<\/span><\/p>\n

<\/p>\n

select  table_name, NUM_ROWS, BLOCKS, EMPTY_BLOCKS, AVG_SPACE, CHAIN_CNT, AVG_ROW_LEN, SAMPLE_SIZE, LAST_ANALYZED, AVG_SPACE_FREELIST_BLOCKS, NUM_FREELIST_BLOCKS, GLOBAL_STATS                   <\/span><\/p>\n

from  all_tables<\/span><\/p>\n

where  owner = USER<\/span><\/p>\n

  and  table_name = ‘blueone’<\/span><\/p>\n

————<\/span><\/p>\n

union all<\/span><\/p>\n

————<\/span><\/p>\n

select  partition_name, NUM_ROWS, BLOCKS, EMPTY_BLOCKS, AVG_SPACE, CHAIN_CNT, AVG_ROW_LEN, SAMPLE_SIZE, LAST_ANALYZED, null, null, null<\/span><\/p>\n

from  all_tab_partitions<\/span><\/p>\n

where  table_owner = USER<\/span><\/p>\n

  and  table_name = ‘blueone’<\/span><\/p>\n

;<\/span><\/p>\n

<\/p>\n

<\/p>\n

\/*<\/span><\/p>\n

<\/p>\n

                                                                                          Avg_<\/span><\/p>\n

                                                 Avg_                                   Space_      Num_<\/span><\/p>\n

                Num_        Empty_  Avg_ Chain_  Row_   Sample_                      Freelist_ Freelist_ Global<\/span><\/p>\n

Table_Name      Rows Blocks Blocks Space    Cnt   Len      Size Last_Analyzed           Blocks    Blocks Stats<\/span><\/p>\n

———- ——— —— —— —– —— —– ——— ——————– ——— ——— ——<\/span><\/p>\n

blueone           10000    236    148  1940      0   125         0 03\/08\/26-16:12:11            0         0 NO<\/span><\/p>\n

PT              7519    189     67  2273   1557   129      7519 03\/08\/26-16:12:10<\/span><\/p>\n

PZ              2481     47     81   934    619   113      2481 03\/08\/26-16:12:11<\/span><\/p>\n

<\/p>\n

*\/<\/span><\/p>\n

<\/p>\n

<\/p>\n

drop table blueone;<\/span><\/p>\n

— recreate blueone<\/span><\/p>\n

<\/p>\n

declare BEGIN dbms_stats.gather_table_stats(ownname=>USER, tabname=>’blueone’ ); END;<\/span><\/p>\n

\/<\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

                                                                                          Avg_<\/span><\/p>\n

                                                 Avg_                                   Space_      Num_<\/span><\/p>\n

                Num_        Empty_  Avg_ Chain_  Row_   Sample_                      Freelist_ Freelist_ Global<\/span><\/p>\n

Table_Name      Rows Blocks Blocks Space    Cnt   Len      Size Last_Analyzed           Blocks    Blocks Stats<\/span><\/p>\n

———- ——— —— —— —– —— —– ——— ——————– ——— ——— ——<\/span><\/p>\n

blueone           10000    236      0     0      0   120     10000 03\/08\/26-16:20:07            0         0 YES<\/span><\/p>\n

PT              7519    189      0     0      0   124      7519 03\/08\/26-16:20:06<\/span><\/p>\n

PZ              2481     47      0     0      0   107      2481 03\/08\/26-16:20:06<\/span><\/p>\n

<\/p>\n

<\/p>\n

analyze table blueone delete statistics;<\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

<\ucc28\uc774\uc810><\/span><\/p>\n

<\/p>\n

<\/p>\n

                  NUM_ROWS     BLOCKS EMPTY_BLOCKS  AVG_SPACE  CHAIN_CNT AVG_ROW_LEN SAMPLE_SIZE LAST_ANALYZED<\/span><\/p>\n

                ———- ———- ———— ———- ———- ———– ———– —————–<\/span><\/p>\n

ANALYZE              27263        512            0        642       4444         127       27263 03\/08\/26-15:55:32<\/span><\/p>\n

DBMS_STATS           27263        512            0          0          0         123       27263 03\/08\/26-15:56:13<\/span><\/p>\n

<\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

     Analyze\ub294 Serial Statistics Gathering \uae30\ub2a5 , DBMS_STATS\uc740 Parallel Gathering \uae30\ub2a5 1. Analyze\ub294 \ud30c\ud2f0\uc158\uc758 \ud1b5\uacc4\uc815\ubcf4\ub97c \uac01 \ud30c\ud2f0\uc158 \ud14c\uc774\ube14\uacfc \uc778\ub371\uc2a4\uc5d0 \ub300\ud574\uc11c \uc218\uc9d1\ud558\uace0, Global Statistics\ub294 \ud30c\ud2f0\uc158 \uc815\ubcf4\ub97c \uac00\uc9c0\uace0 \uacc4\uc0b0\ud558\ubbc0\ub85c, \ube44\uc815\ud655\ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \ud30c\ud2f0\uc158 \ub610\ub294 \uc11c\ube0c\ud30c\ud2f0\uc158\uc774 \uc788\ub294 \uac1d\uccb4\uc5d0\ub294 DBMS_STATS\uc744 \uc0ac\uc6a9 \ud574\uc57c \ud568.  2. DBMS_STATS\uc740 \uc804\uccb4 \ud074\ub7ec\uc2a4\ud130\uc5d0 \ub300\ud574\uc11c\ub294 \ud1b5\uacc4\uc815\ubcf4\ub97c \uc218\uc9d1\ud558\uc9c0 \uc54a\uc73c\ubbc0\ub85c Analyze\ub97c \uc0ac\uc6a9 3. DBMS_STATS\uc740 CBO\uc640 \uad00\ub828\ub41c \ud1b5\uacc4\uc815\ubcf4\ub9cc\uc744 \uc218\uc9d1\ud55c\ub2e4. \ud14c\uc774\ube14\uc758 EMPTY_BLOCKS, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"categories":[9],"tags":[326,161,134,162,726],"jetpack_featured_media_url":"","amp_enabled":true,"_links":{"self":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1301"}],"collection":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1301"}],"version-history":[{"count":0,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1301\/revisions"}],"wp:attachment":[{"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}