Tuning RAC and using parallel features(2)
Internal Workings of the Oracle RAC System In 9i RAC, we no longer talk about DLM,PCM, non-PCM, Lock Monitor,etc.Most of the functionality is replaced in Oracle 10g or performed in the name of ...
Tuning RAC and Using Parallel Features(1)
Cluster interconnect If a block of data is on one node and the user asks for it on another node, oracle uses cache fusion to pass one block through the interconnect to the other n...
How can i extract data from flat file to oracle tablw with plsql?
Pl/sql cao do it SQL> create or replace function dump_csv( p_query in varchar2, 2 &n...
spfile在11G的一点改进
spfile在11G的一点改进在11G中,oracle为保护spfile也做了一些小小的改进,例如,在运行时,spfile无法中被删除时,可以从memory中直接读出所有参数的值模拟spfile被删除[oracle@rac2 dbs]$ rm spfileorcl.ora尝试修...
cursor_sharing_exact hints的使用
cursor_sharing_exact hints的使用主要当cursor_sharing=similar或者force的时候使用比较方便,以下就是为cursor_sharing=similar的时候的一个sqltrace.可以看到当使用hints cursor_sharing_exact后,Misses in li...
使用临时表来优化的存储过程
使用临时表来优化的存储过程对于海量数据作检索的时候,通常会由于巨大的数据量,造成大量的排序和过滤。SELECT TECHNOLOGY_RRN, TECHNOLOGY_ID, &nb...
EXPLAIN PLAN WHEN USING PARTITIONS
EXPLAIN PLAN WHEN USING PARTITIONSTable partitions yield different outputs for their EXPLAIN PLANs (as shown in the following listing).Here, we create a table with three partitions and a parti...
Using dbms_monitor
Using dbms_monitor SQL> select sid,serial# ,username from v$session; SID SERIAL# USERNAME---------- ---------- -------------------...