因此,与hash_value相比,sql_id可以更有效的唯一表示一个sql语句。 补充:我们也可以通过dbms_utility.sqlid_to_sqlhash把sqlid转换为hash_value;通过dbms_sqltune_util1.sqltext_to_sqlid来获取某语句的sql_id SQL> select dbms_utility.sqlid_to_sqlhash('bhsz5y2c6am63') from dual; DBMS_UTILITY.SQLID_...
因为10g+的哈希算法变了,所以10g之前的hash_value其实v$sql.old_hash_value。 但是需要说的是,library cache obj实际上还是通过hash_value+address的方式来组织的,Tanel只说了sql_id的后4 bytes是hash_value,但是没有说前4 bytes代表什么含义,个人觉得KGLNAHSV中有一部分应该是代表了address的,因为既然hash_value...
1)oracle 用MD5算法对library cache obj 进行哈希,生成一个128bit的hash value,也就是KGLNAHSV(16进制). 2)KGLNAHSV的低64bit作为SQL_ID(32进制). 3)KGLNAHSV的低32bit作为HASH_VALUE(10进制) 这两者可以相互转换,在Oracle 10g中,提供了一个包函数,用于转换: SQL> select sql_id,hash_value,dbms_utilit...
a.plan_hash_value, a.CPU_TIME_DELTA from wrh$_sqlstat a, wrm$_snapshot b where a.snap_id = b.snap_id and a.instance_number = b.instance_number and a.sql_id = '&sql_id' order by 4, 1, 3;
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lpad(decode(cost,null,' ', decode(sign(cost-10000000), -1, cost||' ', decode(sign(cost-1000000000), -1, trunc(cost/1000000)||'M', trunc(cost/1000000000)||'G'))), 8, ' ') || '|' as "Explain plan" from v$sql_plan sp ...
这两个hash_value 是数据库内部使用的一个hash值 hash_value 具体可对应到 v$sql 的hash_value plan_hash_value 则对应到执行计划相关表的hash值
SQL> select sql_id,hash_value,dbms_utility.SQLID_TO_SQLHASH(sql_id) convert from v$sql where rownum <9; SQL_ID HASH_VALUE CONVERT --- --- --- 1fkh93md0802n 36576953163657695316 b39dwjz0a404c 3231842444 3231842444 93s9k7wvfs05m 921436339 921436339 50...
SQL Query Select hashbytes('MD5', PNumber+CONVERT(VARCHAR(50),cast(datestamp as binary),1)) From dbo.Events Now i need to get the equivalent C# function in order to get the hash value and pass it to Store Proc. I am using below code to get the c# equivalent. But values are not ...
You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan:SQL> SELECT product_nameFROM order_items o, product_infornation p...