1.parallel execution 并行執(zhí)行

2.strength優(yōu)點(diǎn) weakness缺點(diǎn) seed潛能 virtue 品德 competence能力

3. variable scn numberexec :scn:=dbms_flashback.get_system_change_number;

select * from tablename as of scn :scn;

select * from tablename as of timestamp sysdate-1/1440;?

select timestamp_to_scn(to_date('2010-01-01 10:10:10','yyyy-mm-dd hh24:mi:ss')) from dual；

alter table enable row movement; /*this operation will cause a new rowid;*/

flashback table tablename to scn :scn;

function index: create index t_index on t(nvl(id,-1));

4.better not to create temporary table in procedure:

　　because DDL statement will commit transaction;

　　must dynamicly using the temporary table in procedure;

　　Its performance is worse than static statement.

轉(zhuǎn)載于:https://www.cnblogs.com/asingna/archive/2011/03/15/1984787.html

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