insert into /*+parallel(A,10)*/ TEST A SELECT * FROM TEST_TEM B; 44S insert into TEST A SELECT/*+parallel(B,10)*/ * FROM TEST_TEM B; 41S insert into /*+parallel(A,10)*/TEST A SELECT/*+parallel(B,10)*/ * FROM TEST_TEM B; 49S 完全不用并发HINT /*+parallel(A,10)*/反...
Oracle hint 之 insert /*+ append */ 快速插入数据 向表中插入大量数据时,可通过使用hint直接路径操作(insert /*+ append */)来提升性能。具体分析如下: 1、非归档模式下,只使用hint直接路径操作(insert /*+ append */)就能大量减少REDO日志;归档模式下,使用hint直接路径操作要同时设置表不写日志才能大量...
db block gets 110606 consistent gets 2 physical reads 333527468 redo size 846 bytes sent via SQL*Net to client 840 bytes received via SQL*Net from client 3 SQL*Net roundtrips to/from client 1 sorts (memory) 0 sorts (disk) 2853792 rows processed SQL> select /*+ parallel(4) */f.owner,...
SQL>truncatetablebig_table_dir_test1;insertintobig_table_dir_test1select/*+ parallel(b 4)*/*frombig_table_dir_test b;Tabletruncated. Elapsed:00:00:00.05SQL>SQL>2853792rows created. Elapsed:00:00:04.66Statistics---139recursive calls358365db block gets110606consistent gets2physical reads333527468re...
【知识点整理】Oracle中NOLOGGING、APPEND、ARCHIVE和PARALLEL下,REDO、UNDO和执行速度的比较 1BLOG文档结构图 2前言部分 2.1导读和注意事项 各位技术爱好者,看完本文后,你可以掌握如下的技能,也可以学到一些其它你所不知道的知识,~O(∩_∩)O~: ① 系统和会话级别的REDO和UNDO量的查询 ...
In parallel mode, conventional insert can be used only if you specify the NOAPPEND hint. In direct-path INSERT, data is appended to the end of the table, rather than using existing space currently allocated to the table. As a result, direct-path INSERT can be considerably faster than ...
这个SQL默认并没有开启并行DML,只是后面的select部分使用了并行,这种情况没有使用append。 alter session enable parallel dml; --启用并行DML insert /*+ parallel(4) */ into xxx select 这时就启用了并行DML,不加append的hint,默认也是append插入模式。
Conventional INSERT is the default in serial mode. In serial mode, direct path can be used only if you include the APPEND hint. Direct-path INSERT is the default in parallel mode. In parallel mode, conventional insert can be used only if you specify the NOAPPEND hint. ...
♣ 题目部分 在Oracle中,关键字NOLOGGING、APPEND和PARALLEL提高DML性能方面有什么差别?...提示的情况下,只要NOLOGGING或NOARCHIVELOG满足一个条件即可产生少量的Redo和Undo。...7、 MERGE:在关联更新的情况下,MERGE语句的非关联形式的性能比UPDATE要高,若加上并行性能更好。 8、 总体而言,非归档比归档模式下性能高...
Insert with append hint.(INSERT /*+append*/ into tbl_name SELECT * FROM v_tbl) Rebuild index nologging. The code is written in a package which is being run with a scheduler_job on an interval. v_tbl- a view that encapsulate the original external table structure(view is being bui...