[bbk2192] 第33集 - Chapter 09-Optimizing Sore Perations(02)

SQL> SELECT low_optimal_size "Low",High_optimal_size "Hight",optimal_executions "Opt",onepass_executions "One",multipasses_executions "Multi",total_executions "Total"
2  FROM v$sql_workarea_histogram;

Low      Hight        Opt        One      Multi      Total
---------- ---------- ---------- ---------- ---------- ----------
0       1023          0          0          0          0
1024       2047          0          0          0          0
2048       4095     170714          0          0     170714
4096       8191          0          0          0          0
8192      16383          0          0          0          0
16384      32767          0          0          0          0
32768      65535          0          0          0          0
65536     131071        638          0          0        638
131072     262143        392          0          0        392
262144     524287        368          0          0        368
524288    1048575       2924          0          0       2924

Low      Hight        Opt        One      Multi      Total
---------- ---------- ---------- ---------- ---------- ----------
1048576    2097151       1105          0          0       1105
2097152    4194303        225          0          0        225
4194304    8388607        203          0          0        203
8388608   16777215          2          4          0          6
16777216   33554431         12          0          0         12
33554432   67108863          2          0          0          2
67108864  134217727          0          0          0          0
134217728  268435455          0          0          0          0
268435456  536870911          0          0          0          0
536870912 1073741823          0          0          0          0
1073741824 2147483647          0          0          0          0

Low      Hight        Opt        One      Multi      Total
---------- ---------- ---------- ---------- ---------- ----------
2147483648 4294967295          0          0          0          0
4294967296 8589934591          0          0          0          0
8589934592 1.7180E+10          0          0          0          0
1.7180E+10 3.4360E+10          0          0          0          0
3.4360E+10 6.8719E+10          0          0          0          0
6.8719E+10 1.3744E+11          0          0          0          0
1.3744E+11 2.7488E+11          0          0          0          0
2.7488E+11 5.4976E+11          0          0          0          0
5.4976E+11 1.0995E+12          0          0          0          0
1.0995E+12 2.1990E+12          0          0          0          0
2.1990E+12 4.3980E+12          0          0          0          0

33 rows selected.

PGA Cache Hit Percentages

col "0/1/m" format a10
col name format a20
SELECT operation,options,object_name name,
trunc(bytes/1024/1024) "input(MB)",
trunc(last_memory_used/1024) last_mem,
trunc(estimated_optimal_size/1024) optimal_mem,
trunc(estimated_onepass_size/1024) onepass_mem,
decode(optimal_executions,null,null,optimal_executions||'/'||onepass_executions||'/'||multipasses_executions) "0/1/M"
FROM V$SQL_PLAN p,V$SQL_WORKAREA w
WHERE p.address=w.address(+)
AND p.hash_value=w.hash_value(+)
AND p.id=w.operation_id(+);