Hp-unix下为Oracle配置异步IO.docVIP

下载本文档

9
0
约6.84千字
约 5页
2017-12-21 发布于河南
举报
版权申诉

Hp-unix下为Oracle配置异步IO.doc

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Hp-unix下为Oracle配置异步IO

Export Zone,lun, prosent PURPOSE-------The purpose of this document is to discuss the implementation ofasynchronous i/o (aio) on HP-UX, specifically to enable aio for the OracleRDBMS Server.SCOPE APPLICATION-------------------This note is intended for DBAs and Support Personnel.1.0 Introduction================On HP-UX, when the Oracle datafiles reside on a filesystem, then the DBWRprocess(es) make synchronous writes to these datafiles. This means that eachwrite must return with a succesful completion before the next write isissued. This serial operation can lead to a i/o bottleneck. There are two waysto counteract this:a. configure multiple DBWR processesb. use asynchronous i/oBefore deciding on one of these two options, it should be noted that on HP-UX,aio is *only* possible on a raw device. Put in another way, aio *cannot* be usedon a filesystem.Multiple DBWRs can be used on a filesystem.It is not recommended to use both multiple DBWRs and aio.2.0 Configuring asynchronous i/o================================aio requires configuration of both Oracle and HP-UX2.1 HP-UX Configuration-----------------------a. create the /dev/async character device% /sbin/mknod /dev/async c 101 0x0% chown oracle:dba /dev/async% chmod 660 /dev/asyncIf the device does not exist, then ENODEV (Err #19) is returned when the deviceis accessed:Async driver not configured : errno=19If the permissions are incorrect, then EACCES (Err #13) is returned:Async driver not configured : errno=13b. configure the async driver in the kernelUsing SAM- Kernel Configuration- Drivers- the driver is called asyncdskGenerate new kernelRebootc. set max_async_portsUsing SAM- Kernel Configuration- Configurable Parameters- max_async_portsmax_async_ports limits the maximum number of processes that can concurrentlyuse /dev/async. Set this parameter to the sum ofprocesses from init.ora + number of background processesThe background processes started at insta