[20220303]oracle如何定位使用library cache mutex 3.txt[通俗易懂]

[20220303]oracle如何定位使用library cache mutex 3.txt

–//这个问题实际上困扰我很久，我开始以为library cache bucket在1个chunk内，只要知道 基地址+40*buckect值 获得偏移,定位
–//library cache bucket 的地址。
–//注：11g 下每个library cache bucket占用16字节，后面跟着mutex，mutex结构占用24字节(注:有朋友讲占用16字节,我想与转储看
–//到mutex仅仅有4个值有关,4*4=16，我个人还是按照24字节来算),这样整个结构占用40字节。

–//可以参考我前面的测试 [20210524]分析library cache转储 3.txt

–//而实际上的情况被分成好几个chunk，显然无法简单的通过 基地址+40*buckect值 计算获得偏移，那么oracle计算sql语句的
–//hash_value，通过hash_value值计算出bucket值, 等于hash_value % (2^_kgl_bucket_count * 256) ,知道bucket数值，
–//如何通过bucket数值来定位library cache muext的地址呢？自己尝试做这方面的探究。

–//测试_kghdsidx_count <> 1 的情况。

1.环境：
SCOTT@book> @ ver1
PORT_STRING         VERSION    BANNER
——————- ———- —————————————————————————-
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 – 64bit Production

SYS@book> alter system set “_kghdsidx_count”=3 scope=spfile;
System altered.

SYS@book> @ hide _kgl_bucket_count
NAME              DESCRIPTION                                                        DEFAULT_VALUE SESSION_VALUE SYSTEM_VALUE ISSES ISSYS_MOD
—————– —————————————————————— ————- ————- ———— —– ———
_kgl_bucket_count Library cache hash table bucket count (2^_kgl_bucket_count * 256)  TRUE          9             9            FALSE FALSE
–//缺省2^9*256 = 131072.
–//重启数据库略.
SYS@book> @ hide _kghdsidx_count
NAME            DESCRIPTION        DEFAULT_VALUE SESSION_VALUE SYSTEM_VALUE ISSES ISSYS_MOD
————— —————— ————- ————- ———— —– ———
_kghdsidx_count max kghdsidx count FALSE         3             3            FALSE FALSE

–//首先说明一下11g使用library cache mutex代替10g library cache latch,定位library cache mutex就很容易定位library cache
–//latch地址，仅仅偏移16字节。而且muext结构体里面记录了library cache latch值。
–//参考：http://blog.itpub.net/267265/viewspace-2792123/ =>[20210915]探究mutex的值 6.txt

2.建立测试环境：
create table t as select rownum id ,”test” pad from dual connect by level<=1e6;
alter table t add constraint pk_t  primary key (id);
exec dbms_stats.gather_table_stats(user, “t”, method_opt=>”for all columns size 1″);
alter system flush shared_pool;

$ cat tt1.txt
declare
v_pad varchar2(10);
begin
for i in 1 .. 1e5 loop
execute immediate “select pad from t where id = ” || i into v_pad;
end loop;
end;
/

@ tt1.txt

3.转储library_cache:
–//有了前面的探究，这次就简单许多。

SYS@book> oradebug setmypid
Statement processed.

SYS@book> oradebug dump library_cache 8
Statement processed.

SYS@book> @ ttt
tracefile_identifier = /u01/app/oracle/diag/rdbms/book/book/trace/book_ora_18540.trc

$ grep “Bucket:” /u01/app/oracle/diag/rdbms/book/book/trace/book_ora_18540.trc | sed “s/^Bucket: #=//;s/Mutex=//;s/(.*)//” >| d1.txt
–//将Bucket以及mutex地址写入文件d1.txt

$ awk “NR==1{a=$1;b=strtonum($2) } NR>1{ print (strtonum($2)-b)/($1-a);a=$1;b=strtonum($2)}”  d1.txt | sort | uniq -c | sort -nr
   2549 40
      5 304257
      4 -98694
      4 -77020.7
      4 -229966
      4 223133
      4 -116978
      3 -80194.5
      3 -67183.1
      3 -59961.5
      3 -51754.9
      3 -48567.5
      3 -405852
      3 -32871.3
      3 323884
      3 303913
      3 -287467
      3 -275967
      3 -265351
      3 264229
      3 -26289.1
      3 -24643.5
      3 239068
      3 -191631
      3 -175487
      3 147675
      3 127118
      3 -126593
      3 -125418
      3 112840
      3 -108908
      2 -95795.7
      2 -93205.5
      2 -90751.7
      2 -90231.1
      2 -87759
      2 -87723.6
      2 -85351.6
      2 84402.8
      2 82328.3
      2 -78947.2
      2 -74961.8
      2 -74788.7
      2 -73436.5
      2 -73366
      2 -65782.7
      2 -61910.7
      2 607786
      2 -59444.2
      2 -58436
      2 -50110.6
      2 -47116.5
      2 456366
      2 -44459.8
      2 -43841.8
      2 -42086.5
      2 418339
      2 -41532.2
      2 -40992.3
      2 -39953.5
      2 -36698.2
      2 -34679.6
      2 -33571.6
      2 -32199.7
      2 -31874
      2 -313604
      2 -30634.6
      2 -30339.7
      2 -30050.4
      2 -29766.5
      2 -29487.9
      2 -28946.1
      2 -287186
      2 286874
      2 -27920.1
      2 -26510.3
      2 -263251
      2 257455
      2 -255522
      2 -242998
      2 -23715.5
      2 -23363.6
      2 228203
      2 213639
      2 -205739
      2 -197428
      2 196887
      2 193101
      2 -186451
      2 -18118
      2 -168257
      2 164852
      2 -164583
      2 -164250
      2 159392
      2 -153297
      2 -149964
      2 145535
      2 -143573
      2 141437
      2 -132656
      2 132134
      2 123980
      2 119554
      2 -113078
      2 -105276
      2 -102948
      2 102481
      2 -101879
      1 -99962.4
      1 -99731.6
      1 98463.3
      1 -98242.5
      1 97279.4
      1 -97145.5
      1 96570.5
      1 -95702.1
      1 95651.2
      1 -95393.7
      1 93539.4
      1 -92886.1
      1 908942
      1 90483
      1 -89572.6
      1 -88423.7
      1 88102.9
      1 -87303.9
      1 -862481
      1 -82271.6
      1 81753.7
      1 -81255.4
      1 80353.4
      1 79716
      1 -77490
      1 -766645
      1 -76628.5
      1 -75786
      1 -75648.8
      1 -75185.9
      1 74959.2
      1 74404.3
      1 73318.7
      1 73152.3
      1 -73125.9
      1 72606.7
      1 -72321.8
      1 -71836.8
      1 -71766.5
      1 -71535.3
      1 71239.8
      1 -71095.8
      1 70738.4
      1 -70369.9
      1 -70170.8
      1 -69275
      1 69004.1
      1 -68961.7
      1 -68644.5
      1 -67845.9
      1 -67608.7
      1 67417
      1 66967.8
      1 -66951.9
      1 66189.2
      1 66087.2
      1 -658453
      1 -65809.3
      1 -65675.9
      1 65229.5
      1 -64439.3
      1 -63891.3
      1 -63264.3
      1 -63149.8
      1 -631065
      1 -62688.8
      1 -62082
      1 62010.2
      1 -61568.6
      1 61196.8
      1 -61023.4
      1 -60719.4
      1 590580
      1 58972.9
      1 -58469
      1 -580047
      1 -574974
      1 -56726.6
      1 -56379.4
      1 -56241.4
      1 557772
      1 -55161.3
      1 -54433.9
      1 54061.9
      1 540259
      1 -53867.6
      1 53439.9
      1 -51841
      1 51763.1
      1 51218.6
      1 511826
      1 51000.3
      1 -50919.5
      1 501999
      1 49738.9
      1 -49327
      1 -492829
      1 -49246.9
      1 -48552.7
      1 478096
      1 -470312
      1 -46582.8
      1 4614464
      1 -46008.4
      1 -45961.1
      1 -458416
      1 -45749.7
      1 -45095.5
      1 44658.6
      1 442037
      1 -44154.1
      1 44071.5
      1 436526
      1 -43086.1
      1 -42655.8
      1 42318
      1 -41902.2
      1 41595.3
      1 -41374.6
      1 -41115.8
      1 -40789.4
      1 405204
      1 -40466.3
      1 -40311.9
      1 401607
      1 -39389.5
      1 -38966
      1 -38725
      1 -38490.3
      1 -38082.5
      1 38024.1
      1 -376440
      1 374038
      1 -36276.7
      1 -35863.3
      1 358582
      1 -35527.9
      1 35514.1
      1 347323
      1 346218
      1 -344968
      1 -33951
      1 -33933
      1 -329206
      1 -32532
      1 -31758
      1 31609.7
      1 -315909
      1 313715
      1 -31242.1
      1 -30935.4
      1 -30764.3
      1 -30357.2
      1 277867
      1 -27674.8
      1 -27433.8
      1 2.72675e+06
      1 270149
      1 -26964.2
      1 26535.7
      1 262849
      1 -25421.9
      1 251019
      1 2509834
      1 -246395
      1 244898
      1 -23732.3
      1 -23022
      1 226178
      1 -225638
      1 -22527.8
      1 -22147
      1 -219458
      1 218283
      1 -21749.6
      1 -215590
      1 -21307.9
      1 -212377
      1 -21023.3
      1 -20883.8
      1 -2.03026e+06
      1 -202906
      1 202622
      1 2.00788e+06
      1 -197108
      1 -19706.8
      1 -19463
      1 -193634
      1 -19225.2
      1 -18993.1
      1 189458
      1 -18879.1
      1 185951
      1 -182875
      1 176166
      1 -17512.7
      1 -17415.7
      1 -16765.8
      1 167360
      1 -166249
      1 -16330.4
      1 161962
      1 -16079.8
      1 -160568
      1 159449
      1 154388
      1 -15297.3
      1 152149
      1 -15149.8
      1 -15005.2
      1 -149617
      1 -14519.9
      1 145173
      1 143457
      1 1434208
      1 -143111
      1 143039
      1 1.3951e+06
      1 -13940
      1 -13817.4
      1 137563
      1 136997
      1 135705
      1 -135257
      1 -134346
      1 -13404.6
      1 133896
      1 133245
      1 -1.32202e+06
      1 -131605
      1 131445
      1 130419
      1 -130152
      1 128747
      1 -123177
      1 -121479
      1 -118928
      1 118148
      1 -117548
      1 115433
      1 114122
      1 -113493
      1 -11203.7
      1 111809
      1 -111569
      1 1115504
      1 -111253
      1 109298
      1 1.09072e+06
      1 -107775
      1 106840
      1 105716
      1 -104508
      1 -10421.9
      1 103537
      1 102397
      1 1.01888e+06
      1 100287
–//可以发现40出现次数最多，说明一个chunk内每个mutex地址的间隔是40个字节，参考[20210524]分析library cache转储 3.txt 的测试。
–//出现1个很奇怪的现象，一种感觉怎么会使用这么多的chunk，这个好像有点问题。
$ awk “NR==1{a=$1;b=strtonum($2) } NR>1{ print (strtonum($2)-b)/($1-a);a=$1;b=strtonum($2)}”  d1.txt | sort | uniq -c | sort -nr|wc
    367     734    5928
–//为什么？我很久以前做探究时就遇到这个情况，当时想”_kghdsidx_count”=1的情况我都不清楚，这个问题就暂时先放一放。
–//现在有了前面的探究，感觉难度不是太大，自己再次尝试看看。

–//查询地址跳跃的情况，也就是间隔不是40的情况。
$  awk “NR==1{a=$1;b=strtonum($2);c=$2 } NR>1{ print a,c,$1,$2,(strtonum($2)-b)/($1-a);a=$1;b=strtonum($2);c=$2}”  d1.txt | grep -v “40$” | head
229 0x8678c5e0 310 0x86145828 -81255.4
447 0x86146d90 543 0x85e446d0 -32871.3
664 0x85e459b8 783 0x8678cc70 81753.7
990 0x8678ecc8 1107 0x861484b0 -56241.4
1223 0x861496d0 1389 0x85e47b00 -18993.1
1514 0x85e48e88 1648 0x86790398 72606.7
1695 0x86790af0 1855 0x8614a990 -41115.8
2019 0x8614c330 2126 0x85e49e28 -29487.9
2286 0x85e4b728 2308 0x86791ab8 442037
2552 0x867940d8 2601 0x8614ce20 -134346
–//注：太长我使用head显示前10行。

–//取出第2个字段，通过awk保存aa4.txt：
$ awk “NR==1{a=$1;b=strtonum($2);c=$2 } NR>1{ print a,c,$1,$2,(strtonum($2)-b)/($1-a);a=$1;b=strtonum($2);c=$2}”  d1.txt | grep -v “40$” | awk “{print “@fchaz ” $2}” > aa4.txt
$ head -3 aa4.txt
@fchaz 0x8678c5e0
@fchaz 0x86146d90
@fchaz 0x85e459b8
–//注：fcha.sql脚本前面有prompt，pause命令，我不可能每次都按1次回车太浪费时间，我建立一个新的fchaz.sql脚本，删除这部分
–//内容,我自己还做了一点小改动，增加结束地址显示。

–//先不执行如上aa4.txt脚本，先确定bucket 0的地址看看。
$ head -1 d1.txt
16 0x8678a498
–//跟踪文件对应记录内容如下：
–//Bucket: #=16 Mutex=0x8678a498(0, 6, 0, 6)
–//16*40 = 640，该bucket的地址 0x8678a498 – 16 = 0x8678a488。

SYS@book> @ tpt/calc 0x8678a488 – 640
                                DEC                  HEX
———————————– ——————–
                  2256052744.000000             8678A208
–//bucket 0 的地址 0x8678A208

SYS@book> @ fcha 0x8678A208
Find in which heap (UGA, PGA or Shared Pool) the memory address 0x8678A208 resides…
Press ENTER to continue, CTRL+C to cancel…

LOC KSMCHPTR           KSMCHIDX   KSMCHDUR KSMCHCOM           KSMCHSIZ KSMCHCLS   KSMCHTYP KSMCHPAR
— —————- ———- ———- —————- ———- ——– ———- —————-
SGA 0000000086434000          2          1 permanent memor     3979784 perm              0 00
–//如果你注意前面的测试，可以发现KSMCHIDX=2,前面的测试是KSMCHIDX=1。

SYS@book> @ tpt/calc x0000000086034000 + 3979784
                                DEC                  HEX
———————————– ——————–
                  2252339720.000000             863FFA08
–//第一个chunk的范围是 0x86034000  – 0x863FFA08

SELECT rownum
     , x$ksmmem.*
  FROM X$KSMMEM
 WHERE addr between hextoraw(“0000000086034000”) and hextoraw(“00000000863FFA08”)
   AND ksmmmval = hextoraw(“000000008678A208”);
no rows selected
–//恩，没有输出。难道该表不在这个chunk中吗？

–//执行如下：
spool /tmp/fchaz.txt
@aa4.txt
spool off

$ sort /tmp/fchaz.txt | uniq -c
    505
    505 — —————- ———- ———- —————- ———- ——– ———- —————- —————–
    505 LOC KSMCHPTR           KSMCHIDX   KSMCHDUR KSMCHCOM           KSMCHSIZ KSMCHCLS   KSMCHTYP KSMCHPAR         KSMCHPTR_END
    114 SGA 0000000085834000          2          1 permanent memor     3968008 perm              0 00               0000000085BFCC07
    170 SGA 0000000085C34000          1          1 permanent memor     3937272 perm              0 00               0000000085FF53F7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    169 SGA 0000000086034000          3          1 permanent memor     3979488 perm              0 00               00000000863FF8DF
     47 SGA 0000000086434000          2          1 permanent memor     3979784 perm              0 00               00000000867FFA07
      1 SGA 00000000877FCDF0          2          1 permanent memor       10272 perm              0 00               00000000877FF60F
      4 SGA 00000000897F1800          2          1 permanent memor       51232 perm              0 00               00000000897FE01F
      1 SYS@book> @ aa4.txt
      1 SYS@book> spool off
–//从输出结果执行sort,uniq后发现看上去感觉chunk使用很多，自己上就是在6个chunk上跳来跳去。
–//根据前面测试最大可能在KSMCHIDX=1的chunk，也就是下划线的内容指向的chunk可能性最大，当然仅仅是我的猜测。

SELECT rownum
     , x$ksmmem.*
  FROM X$KSMMEM
 WHERE addr between hextoraw(“0000000085C34000”) and hextoraw(“0000000085FF53F7”)
   AND ksmmmval = hextoraw(“000000008678A208”);

    ROWNUM ADDR                   INDX    INST_ID KSMMMVAL
———- —————- ———- ———- —————-
         1 0000000085E431E8   79463997          1 000000008678A208

–//先尝试推断该数组的开始地址是x85E431E8
–//2^9 = 512, 512*8 = 4096

SYS@book> @ tpt/calc x85E431E8 + 4096
                                DEC                  HEX
———————————– ——————–
                  2246328808.000000             85E441E8

–//查询hextoraw(“0000000085E431E8”) and hextoraw(“0000000085E441E0”)范围的信息:
SELECT rownum-1 rn
     , x$ksmmem.*
  FROM X$KSMMEM
 WHERE addr between hextoraw(“0000000085E431E8”) and hextoraw(“0000000085E441E0”);

  RN ADDR                 INDX INST_ID KSMMMVAL
—- —————- ——– ——- —————-
   0 0000000085E431E8 79463997       1 000000008678A208
   1 0000000085E431F0 79463998       1 0000000086144FA8
   2 0000000085E431F8 79463999       1 0000000085E441E8
   3 0000000085E43200 79464000       1 000000008678CA08
   4 0000000085E43208 79464001       1 00000000861477A8
   5 0000000085E43210 79464002       1 0000000085E469E8
   6 0000000085E43218 79464003       1 000000008678F208
   7 0000000085E43220 79464004       1 0000000086149FA8
   8 0000000085E43228 79464005       1 0000000085E491E8
   9 0000000085E43230 79464006       1 0000000086791A08
  10 0000000085E43238 79464007       1 000000008614C7A8
  11 0000000085E43240 79464008       1 0000000085E4B9E8
  12 0000000085E43248 79464009       1 0000000086794208
  13 0000000085E43250 79464010       1 000000008614EFA8
  14 0000000085E43258 79464011       1 0000000085E4E1E8
  15 0000000085E43260 79464012       1 0000000086796A08
  16 0000000085E43268 79464013       1 00000000861517A8
  17 0000000085E43270 79464014       1 0000000085E509E8
  18 0000000085E43278 79464015       1 0000000086799208
  19 0000000085E43280 79464016       1 0000000086153FA8
  20 0000000085E43288 79464017       1 0000000085E531E8
  21 0000000085E43290 79464018       1 000000008679BA08
  22 0000000085E43298 79464019       1 00000000861567A8
  23 0000000085E432A0 79464020       1 0000000085E559E8
  24 0000000085E432A8 79464021       1 000000008679E208
  25 0000000085E432B0 79464022       1 0000000086158FA8
  26 0000000085E432B8 79464023       1 0000000085E581E8
  27 0000000085E432C0 79464024       1 00000000867A0A08
  28 0000000085E432C8 79464025       1 000000008615B7A8
  29 0000000085E432D0 79464026       1 0000000085E5A9E8
  30 0000000085E432D8 79464027       1 00000000867A3208
  31 0000000085E432E0 79464028       1 000000008615DFA8
  32 0000000085E432E8 79464029       1 0000000085E5D1E8
  33 0000000085E432F0 79464030       1 00000000867A5A08
  34 0000000085E432F8 79464031       1 00000000861607A8
  35 0000000085E43300 79464032       1 0000000085E5F9E8
  36 0000000085E43308 79464033       1 00000000867A8208
  37 0000000085E43310 79464034       1 0000000086162FA8
  38 0000000085E43318 79464035       1 0000000085E621E8
  39 0000000085E43320 79464036       1 00000000867AAA08
  40 0000000085E43328 79464037       1 00000000861657A8
  41 0000000085E43330 79464038       1 0000000085E649E8
  42 0000000085E43338 79464039       1 00000000867AD208
  43 0000000085E43340 79464040       1 0000000086167FA8
  44 0000000085E43348 79464041       1 0000000085E671E8
  45 0000000085E43350 79464042       1 00000000867AFA08
  46 0000000085E43358 79464043       1 000000008616A7A8
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  51 0000000085E43380 79464048       1 00000000867B4A08
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  66 0000000085E433F8 79464063       1 00000000867C1208
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  68 0000000085E43408 79464065       1 0000000085E7B1E8
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  71 0000000085E43420 79464068       1 0000000085E7D9E8
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  73 0000000085E43430 79464070       1 0000000086180FA8
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  77 0000000085E43450 79464074       1 0000000085E829E8
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 100 0000000085E43508 79464097       1 00000000861977A8
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 102 0000000085E43518 79464099       1 00000000867DF208
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 105 0000000085E43530 79464102       1 00000000867E1A08
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 109 0000000085E43550 79464106       1 000000008619EFA8
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 142 0000000085E43658 79464139       1 00000000861BA7A8
 143 0000000085E43660 79464140       1 0000000085EB99E8
 144 0000000085E43668 79464141       1 00000000897F1820
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 146 0000000085E43678 79464143       1 0000000085EBC1E8
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 161 0000000085E436F0 79464158       1 0000000085EC89E8
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 170 0000000085E43738 79464167       1 0000000085ED01E8
 171 0000000085E43740 79464168       1 000000008583E020
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 174 0000000085E43758 79464171       1 0000000085840820
 175 0000000085E43760 79464172       1 00000000861D5FA8
 176 0000000085E43768 79464173       1 0000000085ED51E8
 177 0000000085E43770 79464174       1 0000000085843020
 178 0000000085E43778 79464175       1 00000000861D87A8
 179 0000000085E43780 79464176       1 0000000085ED79E8
 180 0000000085E43788 79464177       1 0000000085845820
 181 0000000085E43790 79464178       1 00000000861DAFA8
 182 0000000085E43798 79464179       1 0000000085EDA1E8
 183 0000000085E437A0 79464180       1 0000000085848020
 184 0000000085E437A8 79464181       1 00000000861DD7A8
 185 0000000085E437B0 79464182       1 0000000085EDC9E8
 186 0000000085E437B8 79464183       1 000000008584A820
 187 0000000085E437C0 79464184       1 00000000861DFFA8
 188 0000000085E437C8 79464185       1 0000000085EDF1E8
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 190 0000000085E437D8 79464187       1 00000000861E27A8
 191 0000000085E437E0 79464188       1 0000000085EE19E8
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 193 0000000085E437F0 79464190       1 00000000861E4FA8
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 244 0000000085E43988 79464241       1 000000008620F7A8
 245 0000000085E43990 79464242       1 0000000085F0E9E8
 246 0000000085E43998 79464243       1 000000008587C820
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 248 0000000085E439A8 79464245       1 0000000085F111E8
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 251 0000000085E439C0 79464248       1 0000000085F139E8
 252 0000000085E439C8 79464249       1 0000000085881820
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 255 0000000085E439E0 79464252       1 0000000085884020
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 257 0000000085E439F0 79464254       1 0000000085F189E8
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 259 0000000085E43A00 79464256       1 000000008621BFA8
 260 0000000085E43A08 79464257       1 0000000085F1B1E8
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 262 0000000085E43A18 79464259       1 000000008621E7A8
 263 0000000085E43A20 79464260       1 0000000085F1D9E8
 264 0000000085E43A28 79464261       1 000000008588B820
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 266 0000000085E43A38 79464263       1 0000000085F201E8
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 401 0000000085E43E70 79464398       1 0000000085F909E8
 402 0000000085E43E78 79464399       1 00000000858FE820
 403 0000000085E43E80 79464400       1 0000000086293FA8
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 406 0000000085E43E98 79464403       1 00000000862967A8
 407 0000000085E43EA0 79464404       1 0000000085F959E8
 408 0000000085E43EA8 79464405       1 0000000085903820
 409 0000000085E43EB0 79464406       1 0000000086298FA8
 410 0000000085E43EB8 79464407       1 0000000085F981E8
 411 0000000085E43EC0 79464408       1 0000000085906020
 412 0000000085E43EC8 79464409       1 000000008629B7A8
 413 0000000085E43ED0 79464410       1 0000000085F9A9E8
 414 0000000085E43ED8 79464411       1 0000000085908820
 415 0000000085E43EE0 79464412       1 000000008629DFA8
 416 0000000085E43EE8 79464413       1 0000000085F9D1E8
 417 0000000085E43EF0 79464414       1 000000008590B020
 418 0000000085E43EF8 79464415       1 00000000862A07A8
 419 0000000085E43F00 79464416       1 0000000085F9F9E8
 420 0000000085E43F08 79464417       1 000000008590D820
 421 0000000085E43F10 79464418       1 00000000862A2FA8
 422 0000000085E43F18 79464419       1 0000000085FA21E8
 423 0000000085E43F20 79464420       1 0000000085910020
 424 0000000085E43F28 79464421       1 00000000862A57A8
 425 0000000085E43F30 79464422       1 0000000085FA49E8
 426 0000000085E43F38 79464423       1 0000000085912820
 427 0000000085E43F40 79464424       1 00000000862A7FA8
 428 0000000085E43F48 79464425       1 0000000085FA71E8
 429 0000000085E43F50 79464426       1 0000000085915020
 430 0000000085E43F58 79464427       1 00000000862AA7A8
 431 0000000085E43F60 79464428       1 0000000085FA99E8
 432 0000000085E43F68 79464429       1 0000000085917820
 433 0000000085E43F70 79464430       1 00000000862ACFA8
 434 0000000085E43F78 79464431       1 0000000085FAC1E8
 435 0000000085E43F80 79464432       1 000000008591A020
 436 0000000085E43F88 79464433       1 00000000862AF7A8
 437 0000000085E43F90 79464434       1 0000000085FAE9E8
 504 0000000085E441A0 79464500       1 0000000085FE59E8                                                                                                                                                                                                  [456/29992]
 438 0000000085E43F98 79464435       1 000000008591C820
 439 0000000085E43FA0 79464436       1 00000000862B1FA8
 440 0000000085E43FA8 79464437       1 0000000085FB11E8
 441 0000000085E43FB0 79464438       1 000000008591F020
 442 0000000085E43FB8 79464439       1 00000000862B47A8
 443 0000000085E43FC0 79464440       1 0000000085FB39E8
 444 0000000085E43FC8 79464441       1 0000000085921820
 445 0000000085E43FD0 79464442       1 00000000862B6FA8
 446 0000000085E43FD8 79464443       1 0000000085FB61E8
 447 0000000085E43FE0 79464444       1 0000000085924020
 448 0000000085E43FE8 79464445       1 00000000862B97A8
 449 0000000085E43FF0 79464446       1 0000000085FB89E8
 450 0000000085E43FF8 79464447       1 0000000085926820
 451 0000000085E44000 79464448       1 00000000862BBFA8
 452 0000000085E44008 79464449       1 0000000085FBB1E8
 453 0000000085E44010 79464450       1 0000000085929020
 454 0000000085E44018 79464451       1 00000000862BE7A8
 455 0000000085E44020 79464452       1 0000000085FBD9E8
 456 0000000085E44028 79464453       1 000000008592B820
 457 0000000085E44030 79464454       1 00000000862C0FA8
 458 0000000085E44038 79464455       1 0000000085FC01E8
 459 0000000085E44040 79464456       1 000000008592E020
 460 0000000085E44048 79464457       1 00000000862C37A8
 461 0000000085E44050 79464458       1 0000000085FC29E8
 462 0000000085E44058 79464459       1 0000000085930820
 463 0000000085E44060 79464460       1 00000000862C5FA8
 464 0000000085E44068 79464461       1 0000000085FC51E8
 465 0000000085E44070 79464462       1 0000000085933020
 466 0000000085E44078 79464463       1 00000000862C87A8
 467 0000000085E44080 79464464       1 0000000085FC79E8
 468 0000000085E44088 79464465       1 0000000085935820
 469 0000000085E44090 79464466       1 00000000862CAFA8
 470 0000000085E44098 79464467       1 0000000085FCA1E8
 471 0000000085E440A0 79464468       1 0000000085938020
 472 0000000085E440A8 79464469       1 00000000862CD7A8
 473 0000000085E440B0 79464470       1 0000000085FCC9E8
 474 0000000085E440B8 79464471       1 000000008593A820
 475 0000000085E440C0 79464472       1 00000000862CFFA8
 476 0000000085E440C8 79464473       1 0000000085FCF1E8
 477 0000000085E440D0 79464474       1 000000008593D020
 478 0000000085E440D8 79464475       1 00000000862D27A8
 479 0000000085E440E0 79464476       1 0000000085FD19E8
 480 0000000085E440E8 79464477       1 000000008593F820
 481 0000000085E440F0 79464478       1 00000000862D4FA8
 482 0000000085E440F8 79464479       1 0000000085FD41E8
 483 0000000085E44100 79464480       1 0000000085942020
 484 0000000085E44108 79464481       1 00000000862D77A8
 485 0000000085E44110 79464482       1 0000000085FD69E8
 486 0000000085E44118 79464483       1 0000000085944820
 487 0000000085E44120 79464484       1 00000000862D9FA8
 488 0000000085E44128 79464485       1 0000000085FD91E8
 489 0000000085E44130 79464486       1 0000000085947020
 490 0000000085E44138 79464487       1 00000000862DC7A8
 491 0000000085E44140 79464488       1 0000000085FDB9E8
 492 0000000085E44148 79464489       1 0000000085949820
 493 0000000085E44150 79464490       1 00000000862DEFA8
 494 0000000085E44158 79464491       1 0000000085FDE1E8
 495 0000000085E44160 79464492       1 000000008594C020
 496 0000000085E44168 79464493       1 00000000862E17A8
 497 0000000085E44170 79464494       1 0000000085FE09E8
 498 0000000085E44178 79464495       1 000000008594E820
 499 0000000085E44180 79464496       1 00000000862E3FA8
 500 0000000085E44188 79464497       1 0000000085FE31E8
 501 0000000085E44190 79464498       1 0000000085951020
 502 0000000085E44198 79464499       1 00000000862E67A8
 503 0000000085E441A0 79464500       1 0000000085FE59E8
 504 0000000085E441A8 79464501       1 0000000085953820
 505 0000000085E441B0 79464502       1 00000000862E8FA8
 506 0000000085E441B8 79464503       1 0000000085FE81E8
 507 0000000085E441C0 79464504       1 0000000085956020
 508 0000000085E441C8 79464505       1 00000000862EB7A8
 509 0000000085E441D0 79464506       1 0000000085FEA9E8
 510 0000000085E441D8 79464507       1 0000000085958820
 511 0000000085E441E0 79464508       1 00000000862EDFA8
512 rows selected.
–//注意看最后一列KSMMMVAL，可以发现上下间隔不再是10240.观察最后2位就可以确定。我开始看也怀疑该数组是否不再这个位置或者
–//这样的组织方式,想起前面的输出在几个chunk上跳来跳去，仔细看rn=0,3,6,9,12行，可以发现满足间隔是10240.

        RN ADDR                   INDX    INST_ID KSMMMVAL
———- —————- ———- ———- —————-
         0 0000000085E431E8   79463997          1 000000008678A208
         3 0000000085E43200   79464000          1 000000008678CA08
         6 0000000085E43218   79464003          1 000000008678F208
         9 0000000085E43230   79464006          1 0000000086791A08
        12 0000000085E43248   79464009          1 0000000086794208

–//KSMMMVAL上下相减
–//8678CA08 – 8678A208 = 10240
–//8678F208 – 8678CA08 = 10240
–//86791A08 – 8678F208 = 10240
–//86794208 – 86791A08 = 10240

–//实际上这个时候你可以大致猜测oracle定位library cache mutex地址的大致算法与前面完全一致。
–//确定基地址A x0000000085E431E8，计算sql语句的hash_value获得bucket值，使用bucket/256 取整就可以定位 该数组的地址 等于
–//A +  trunc(bucket/256)*8 ,再通过bucket%256 * 40 + A +  trunc(bucket/256)*8 , 就知道定位该bucket的library cache mutex
–//的地址。

4.通过一个例子来讲解如何定位该bucket地址的.

SYS@book> Select sysdate from dual ;
SYSDATE
——————-
2022-03-03 09:12:01

SYS@book> @ hash
HASH_VALUE SQL_ID        CHILD_NUMBER KGL_BUCKET PLAN_HASH_VALUE HASH_HEX   SQL_EXEC_START      SQL_EXEC_ID
———- ————- ———— ———- ————— ———- ——————- ———–
 381482536 dvk83p4bbtxj8            0      63016      1388734953  16bcf628  2022-03-03 09:12:01    16777216

–//HASH_VALUE=381482536,KGL_BUCKET=63016.
–//计算方法 381482536%(2^9*256) = 63016。 bucket值等于63016。

SYS@book> select trunc (63016 /256 ), mod(63016 ,256)  from dual ;
TRUNC(63016/256) MOD(63016,256)
—————- ————–
             246             40
–//         0 0000000085E431E8   79463997          1 000000008678A208
–//       246 0000000085E43998   79464243          1 000000008587C820
–//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
–//注意bucket从0开始计数。对应前面++++行(246行)。地址为000000008587C820.
–//246*8 = 1968
SYS@book> @ tpt/calc x0000000085E431E8 + 1968
                                DEC                  HEX
———————————– ——————–
                  2246326680.000000             85E43998

–//注意看前面++++行，正好对应ADDR值0000000085E43998，通过这个地址，知道保存的值KSMMMVAL=x000000008587C820
–//MOD(63016,256)=40, 40*40 = 1600

SYS@book> @ tpt/calc x000000008587C820 + 1600
                                DEC                  HEX
———————————– ——————–
                  2240269920.000000             8587CE60

–//x8587CE60这个地址记录的就是bucket = 63016 的开始地址。

SYS@book> oradebug setmypid
Statement processed.
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000B 00000000 0000F628 00000000

–//执行如下，注意我的测试设置session_cached_cursors=50，多次执行后会变成”软软解析”登录会话第一次后执行的是软解析。
–//我采用的执行方式是执行完成马上退出。
$ echo “Select sysdate from dual ;”|sqlplus   -s -l / as sysdba
SYSDATE
——————-
2022-03-03 11:43:50

–//每执行以上语句1次，使用oradebug peek 0x8587CE60 40在另外会话查询该地址 保存前40字节内容。
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000B 00000000 0000F628 00000000
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000C 00000000 0000F628 00000000
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000D 00000000 0000F628 00000000
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000E 00000000 0000F628 00000000

–//注意看mutex结构的第4双字节内容，这里就是第8双字节内容的变化，0x0B->0x0C->0x0D->0x0E，每次执行后增加1.

–//你可以打开一个新会话，执行如下：
SYS@book> Select sysdate from dual ;
SYSDATE
——————-
2022-03-03 11:45:49

SYS@book> Select sysdate from dual ;
SYSDATE
——————-
2022-03-03 11:45:54

SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000E 00000000 0000F628 00000000
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000F 00000000 0000F628 00000000
SYS@book> oradebug peek 0x8587CE60 40
[08587CE60, 08587CE88) = 8273FC18 00000000 8273FC18 00000000 00000000 00000000 0000000F 00000000 0000F628 00000000
–//你可以发现第2次执行就是软软解析，不再touch该bucket。gets的数量不再增加。

SYS@book> @ sharepool/shp4 dvk83p4bbtxj8 0
TEXT                  KGLHDADR         KGLHDPAR         C40                                        KGLHDLMD   KGLHDPMD   KGLHDIVC KGLOBHD0         KGLOBHD6           KGLOBHS0   KGLOBHS6   KGLOBT16   N0_6_16        N20   KGLNAHSH KGLOBT03        KGLOBT09
——————— —————- —————- —————————————- ———- ———- ———- —————- —————- ———- ———- ———- ——— ———- ———- ————- ———-
child handle address  0000000083D930D8 000000008273FC18 Select sysdate from dual                          0          0          0 0000000083EBE590 0000000083EBEDA0       4528       8088       3082     15698      15698  381482536 dvk83p4bbtxj8          0
parent handle address 000000008273FC18 000000008273FC18 Select sysdate from dual                          0          0          0 000000008278F0B0 00                     4720          0          0      4720       4720  381482536 dvk83p4bbtxj8      65535
–//你可以发现bucket地址记录的内容前面就是该语句sql_id=dvk83p4bbtxj8的父游标地址x000000008273FC18.

–//如果你查看父游标0x81EC41D0 开始40字节内容。
SYS@book> oradebug peek 0x000000008273FC18 40
[08273FC18, 08273FC40) = 8587CE60 00000000 8587CE60 00000000 83EBE6C8 00000000 8273FD70 00000000 00000000 10012841
–//开始部分x8587CE60正好是该bucket的地址，oracle正是通过这样的方式链接多个bucket一样的sql语句。

–//关于这部分内容大家可以参考，链接：http://blog.itpub.net/267265/viewspace-2775038/=>[20210602]分析library cache转储 5.txt
–//总之这个地址表是存在的,至于为什么在_kghdsidx_count<>1的情况下这样组织,我就不知道了.

5. 附上shp4.sql脚本：

$ cat sharepool/shp4.sql
column N0_6_16 format 99999999
SELECT DECODE (kglhdadr,
               kglhdpar, “parent handle address”,
               “child handle address”)
          text,
       kglhdadr,
       kglhdpar,
       substr(kglnaobj,1,40) c40,
           KGLHDLMD,
           KGLHDPMD,
           kglhdivc,
       kglobhd0,
       kglobhd6,
       kglobhs0,kglobhs6,kglobt16,
       kglobhs0+kglobhs6+kglobt16 N0_6_16,
           kglobhs0+kglobhs1+kglobhs2+kglobhs3+kglobhs4+kglobhs5+kglobhs6+kglobt16 N20,
           kglnahsh,
           kglobt03 ,
           kglobt09
  FROM x$kglob
 WHERE kglobt03 = “&1″  or kglhdpar=”&1″ or kglhdadr=”&1” or KGLNAHSH= &2;

–//另外fcha.sql ,calc.sql脚本来自Tanel Poder的TPT脚本。在tanelpoder.com/downloads/可以下载。

6.今天上班重启服务器参数没有改变，查看发现该表位置不变，但是记录bucket 0的地址发生了变化。

SYS@book> @ hide _kghdsidx_count
NAME                                     DESCRIPTION                                                        DEFAULT_VALUE          SESSION_VALUE          SYSTEM_VALUE           ISSES ISSYS_MOD
—————————————- —————————————————————— ———————- ———————- ———————- —– ———
_kghdsidx_count                          max kghdsidx count                                                 FALSE                  3                      3                      FALSE FALSE

SYS@book> @ hide _kgl_bucket_count
NAME                                     DESCRIPTION                                                        DEFAULT_VALUE          SESSION_VALUE          SYSTEM_VALUE           ISSES ISSYS_MOD
—————————————- —————————————————————— ———————- ———————- ———————- —– ———
_kgl_bucket_count                        Library cache hash table bucket count (2^_kgl_bucket_count * 256)  TRUE                   9                      9                      FALSE FALSE

SELECT rownum-1 rn
     , x$ksmmem.*
  FROM X$KSMMEM
 WHERE addr between hextoraw(“0000000085E431E8”) and hextoraw(“0000000085E441E0”);

        RN ADDR                   INDX    INST_ID KSMMMVAL
———- —————- ———- ———- —————-
         0 0000000085E431E8   79463997          1 000000008678A508
         1 0000000085E431F0   79463998          1 0000000086144FA8
         2 0000000085E431F8   79463999          1 0000000085E441E8
         3 0000000085E43200   79464000          1 000000008678CD08
         4 0000000085E43208   79464001          1 00000000861477A8
         5 0000000085E43210   79464002          1 0000000085E469E8
         6 0000000085E43218   79464003          1 000000008678F508
         7 0000000085E43220   79464004          1 0000000086149FA8
         8 0000000085E43228   79464005          1 0000000085E491E8
         9 0000000085E43230   79464006          1 0000000086791D08
…

SYS@book> @ fchaz 000000008678A508
LOC KSMCHPTR           KSMCHIDX   KSMCHDUR KSMCHCOM           KSMCHSIZ KSMCHCLS   KSMCHTYP KSMCHPAR         KSMCHPTR_END
— —————- ———- ———- —————- ———- ——– ———- —————- —————–
SGA 0000000086434000          1          1 permanent memor     3980552 perm              0 00               00000000867FFD07

–//不知道为什么，仅仅做一个记录吧。