真实的国产乱ⅩXXX66竹夫人,五月香六月婷婷激情综合,亚洲日本VA一区二区三区,亚洲精品一区二区三区麻豆

成都創(chuàng)新互聯(lián)網(wǎng)站制作重慶分公司

DirectPathReads

Oracle Database SQL Tuning Guide---8 Optimizer Access Paths    

Direct Path Reads
In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.
The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.

Situations in which Oracle Database may perform direct path reads include:

成都創(chuàng)新互聯(lián)公司長(zhǎng)期為近1000家客戶提供的網(wǎng)站建設(shè)服務(wù),團(tuán)隊(duì)從業(yè)經(jīng)驗(yàn)10年,關(guān)注不同地域、不同群體,并針對(duì)不同對(duì)象提供差異化的產(chǎn)品和服務(wù);打造開(kāi)放共贏平臺(tái),與合作伙伴共同營(yíng)造健康的互聯(lián)網(wǎng)生態(tài)環(huán)境。為勐海企業(yè)提供專業(yè)的做網(wǎng)站、網(wǎng)站建設(shè),勐海網(wǎng)站改版等技術(shù)服務(wù)。擁有十年豐富建站經(jīng)驗(yàn)和眾多成功案例,為您定制開(kāi)發(fā)。

  • Execution of a CREATE TABLE AS SELECT statement

  • Execution of an ALTER REBUILD or ALTER MOVE statement

  • Reads from a temporary tablespace

  • Parallel queries

  • Reads from a LOB segment




 
Direct Path Reads

In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.

The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.

Direct Path Reads

In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.

The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.

Direct Path Reads

In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.

The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.

Direct Path Reads

In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.

The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.

Direct Path Reads
In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.


The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.
Direct Path Reads
In a direct path read, the database reads buffers from disk directly into the PGA, bypassing the SGA entirely.


The following figure shows the difference between scattered and sequential reads, which store buffers in the SGA, and direct path reads.












新聞標(biāo)題:DirectPathReads
標(biāo)題鏈接:http://weahome.cn/article/poiioc.html

其他資訊

在線咨詢

微信咨詢

電話咨詢

028-86922220(工作日)

18980820575(7×24)

提交需求

返回頂部