oracle 12cR2 smart flash cache实测
最近一直在处理新系统的性能优化问题,这两天特地测试了下oracle 11gR2开始引入的smart flash cache。
其介绍参考MOS文档,How To Size the Database Smart Flash Cache (文档 ID 1317950.1)
The
Database
Smart Flash Cache
is
a new feature
in
Oracle
Database
11g Release 2 (11.2).
The
Database
Smart Flash Cache
is
a transparent extension
of
the
database
buffer cache using solid state device (SSD) technology.
The SSD acts
as
a
Level
2 cache
to
the (
Level
1) SGA.
Database
Smart Flash Cache can greatly improve the performance
of
Oracle databases
by
reducing the amount
of
disk I/O
at
a much
lower
cost than adding an equivalent amount
of
RAM.
Your
database
is
running
on
the Solaris
or
Oracle Linux operating systems.
The flash cache
is
supported
on
these operating systems
only
.
SQL> startup;
ORA-00439: feature
not
enabled: Server Flash Cache
这明显就是Oracle设置的障碍。
[oracle@oel-12c ~]$ sqlplus "/as sysdba" SQL*Plus: Release 12.2.0.1.0 Production on 星期五 9月 7 20:13:00 2018 Copyright (c) 1982, 2016, Oracle. All rights reserved. 连接到:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production SQL> create tablespace my_ts_2 datafile '/u01/app/oracle/oradata/nfs_to_14/my_ts02.dbf' size 1g autoextend on next 10m maxsize unlimited; 表空间已创建。 SQL> create table my_big_table as select * from dba_tables; 表已创建。 SQL> alter table my_big_table move tablespace my_ts_2; --移动到NFS存储上 表已更改。 SQL> insert into my_big_table select * from my_big_table; 已创建 2106 行。 SQL> / 已创建 4212 行。 SQL> / 已创建 8424 行。 SQL> / 已创建 16848 行。 SQL> / 已创建 33696 行。 SQL> / 已创建 67392 行。 SQL> commit; 提交完成。 SQL> / 提交完成。 SQL> insert into my_big_table select * from my_big_table; 已创建 134784 行。 SQL> / 已创建 269568 行。 SQL> commit; 提交完成。 SQL> insert into my_big_table select * from my_big_table; 已创建 539136 行。 SQL> commit;
使用智能闪存:
SQL> set autotrace on;
SQL> select count(1) from my_big_table; COUNT(1)
----------
1078272 已用时间: 00: 00: 33.06 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
124 recursive calls
0 db block gets
47210 consistent gets
47193 physical reads
132 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
3 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 03.00 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47006 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 04.54 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47020 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 02.24
不使用智能闪存:
SQL> alter system set db_flash_cache_size=0 ; 系统已更改。 已用时间: 00: 00: 01.01
SQL> select count(1) from my_big_table; COUNT(1)
----------
1078272 已用时间: 00: 00: 30.75 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47020 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 32.20 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47020 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 17.56 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47019 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 15.11 执行计划
----------------------------------------------------------
Plan hash value: 1307946652 ---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 12973 (1)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| MY_BIG_TABLE | 969K| 12973 (1)| 00:00:01 |
--------------------------------------------------------------------------- Note
-----
- dynamic statistics used: dynamic sampling (level=2) 统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47094 consistent gets
47019 physical reads
0 redo size
546 bytes sent via SQL*Net to client
607 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed SQL> / COUNT(1)
----------
1078272 已用时间: 00: 00: 15.69
如上所述,性能相差了6-7倍。可见智能闪存效果还是不错的。
不过需要注意的是,如果95%+的常用数据都已经在iops足够高的磁盘上了比如SSD,这个时候又拿一部分SSD作为智能缓存,性能反而会下降比直接访问磁盘高达1倍。
在oracle 11g中,闪存文件只能配置1个,在12c中没有这个限制了。
oracle 12cR2 smart flash cache实测的更多相关文章
- Exadata Smart Flash Logging工作原理
Exadata在V2时代,ORACLE为了进一步拓宽客户人群,除了宣称Exadata适用OLAP系统,同时也适用于OLTP系统,那怎么才能满足OLTP系统的高IOPS要求呢?于是Exadata引入了闪 ...
- [转帖]Oracle 12cR2使用经验
大规模升级来临,谈谈Oracle 12cR2使用经验 随着2019年2月13日,Oracle 19c (Oracle 12.2.0.3) for Exadata 版本发布,Oracle 12cR2体系 ...
- oracle 11g 之 result cache
oracle 11g 之 result cache 今天是2013-10-12,打算最近时间研究一下shared pool的相关原理以及awr报告分析.今天学习一下在oracle 11g shared ...
- Linux平台 Oracle 12cR2 RAC安装Part1:准备工作
Linux平台 Oracle 12cR2 RAC安装Part1:准备工作 一.实施前期准备工作 1.1 服务器安装操作系统 1.2 Oracle安装介质 1.3 共享存储规划 1.4 网络规范分配 二 ...
- Linux平台 Oracle 12cR2 RAC安装Part2:GI配置
Linux平台 Oracle 12cR2 RAC安装Part2:GI配置 三.GI(Grid Infrastructure)安装 3.1 解压GI的安装包 3.2 安装配置Xmanager软件 3.3 ...
- Linux平台 Oracle 12cR2 RAC安装Part3:DB安装
Linux平台 Oracle 12cR2 RAC安装Part3:DB安装 四.DB(Database)安装 4.1 解压DB的安装包 4.2 DB软件安装 4.3 ASMCA创建磁盘组 4.4 DBC ...
- ORACLE性能优化- Buffer cache 的调整与优化
Buffer Cache是SGA的重要组成部分,主要用于缓存数据块,其大小也直接影响系统的性能.当Buffer Cache过小的时候,将会造成更多的 free buffer waits事件. 下面将具 ...
- Oracle 12CR2 中alert.log出现大量的 WARNING: too many parse errors 告警
Oracle 12CR2 中alert.log出现大量的 WARNING: too many parse errors 告警 日志如下: 2018-06-24T17:16:21.024586+08 ...
- Oracle数据库大量library cache: mutex X及latch: shared pool问题排查一例
业务系统数据库夯住,数据库内大量的library cache: mutex X及latch: shared pool等待,alert日志信息如下 Tue Sep :: WARNING: inbound ...
随机推荐
- 大牛推荐的10本学习 Python 的好书
Python:蛇亚目蟒科,主要包括分布于非洲及亚洲的无毒蟒蛇. Python:Richard Clabaugh拍摄的恐怖电影,2000年发行. Python:澳大利亚汽车公司. Python:英国偶发 ...
- iOS 开发笔记-加载/初始化
ViewDidLoad 一般我们会在这里做界面上的初始化操作,比如往view中添加一些子视图.从数据库或者网络加载模型数据装配到子视图中 在自定义控制里 initWithFrame:一般用于添加控件, ...
- animation 老动画
关于设置跳跃: using System.Collections; using System.Collections.Generic; using UnityEngine; public class ...
- Nginx性能调优
[调优]Nginx性能调优 一.Nginx优化配置 1.主配置文件优化:# vi /usr/local/nginx/conf/nginx.conf------------------------- ...
- uvm设计分析——tlm
tlm模块,用来在不同模块之间实现实时通信,主要基于两个定义在通信双方的port类来实现. 两个port之间,通过connect函数,来拿到双方的class指针,进而调用对方的function. 但是 ...
- while练习题
# 1. 使用while循环输出1 2 3 4 5 6 8 9 10count = 1while count <= 10: if count == 7: count += 1 continue ...
- Yii2 Restful api设计--App接口编程
Yii2框架写一套RESTful风格的API,对照魏曦教你学 一,入门 一.目录结构 实现一个简单地RESTful API只需用到三个文件.目录如下: frontend ├─ config │ └ m ...
- codeforces 980A Links and Pearls
题意: 有珍珠和线,问能否重新安排使得相邻珍珠之间的线的数量相等. 思路: 首先,珍珠为0或者线为0,那么都满足条件: 其次,如果珍珠的个数大于线的个数,那么肯定不满足条件: 然后,如果线的个数能够被 ...
- c++学习笔记(二)-指针
1. 指向数组的指针 int balance[5] = { 1000, 2, 3, 17, 50 }; int *ptr; ptr = balance; //ptr是指向数组balance的指针 // ...
- 功能的显著性分析——GO Enrichment Analysis
Gene Ontology(GO)是基因功能国际标准分类体系.GO富集分析是对差异基因等按GO分类,并对分类结果进行基于离散分布的显著性分析.错判率分析.富集度分析,得到与实验目的有显著联系的.低 ...