sql数据库走索引 怎么始终有物理读(2)_MySQL
bitsCN.com
0 0 12 0
05 Fetch 2 0.00 0.00 0 1 0 1
06 ------- ------ -------- ---------- ---------- ---------- ---------- ----------
07 total 4 0.79 0.90 0 1 12 1
08
09 Misses in library cache during parse: 1
10 Optimizer mode: ALL_ROWS
11 Parsing user id: 64
12
13 Rows Row Source Operation
14 ------- ---------------------------------------------------
15 1 SORT AGGREGATE
16 0 FILTER
17 0 INDEX RANGE SCAN IND_T_PREBM4 (object id 38674)
18
19 Elapsed times include waiting on following events:
20 Event waited on Times Max. Wait Total Waited
21 ---------------------------------------- Waited ---------- ------------
22 direct path write 1 0.00 0.00
23 SQL*Net message to client 2 0.00 0.00
24 SQL*Net message from client 2 27.20 27.22
1 insert into sys.fga_log$(sessionid,timestamp#,dbuid,osuid,obj$schema,obj$name,
2 policynbitsCN.com
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to convert a virtual machine to a physical machine?
Feb 19, 2024 am 11:40 AM
Converting a virtual machine (VM) to a physical machine is the process of migrating a virtual instance and associated application software to a physical hardware platform. This conversion helps optimize operating system performance and hardware resource utilization. This article aims to provide an in-depth look at how to make this conversion. How to implement migration from virtual machine to physical machine? Typically, the conversion process between a virtual machine and a physical machine is performed outside the virtual machine by third-party software. This process consists of multiple stages involving the configuration of virtual machines and the transfer of resources. Prepare the physical machine: The first step is to ensure that the physical machine meets the hardware requirements for Windows. We need to back up the data on a physical machine as the conversion process will overwrite the existing data. *Username and password for an administrator account with administrator rights to create system images. will be virtual
Physicists prove that humans live in a 'matrix'? The universe is a 'simulation system', and multiple systems confirm that information evolution tends to be stable
Nov 27, 2023 pm 01:37 PM
Some physicists have confirmed that human beings actually live in matrix space! ? Can such a seemingly mysterious conclusion be confirmed by science? Melvin Vopson, associate professor of physics at the University of Portsmouth and an expert in information theory, proposed in his new paper that the hypothesis that humans live in a simulated world may exist in the basic laws of information. For example, these laws can be hidden in human DNA genetic information or in digital information stored in computers. Paper link: https://pubs.aip.org/aip/adv/article/13/10/105308/2915332/information The second law of dynamics and his results show that over time
Steps to install SQL Server 2021 Developer Edition on Windows 11
Apr 25, 2023 pm 03:07 PM
<ul><li><strong>Click to enter: </strong>ChatGPT tool plug-in navigation list</li></ul><h3>Download address: https://www.microsoft. com/en-us/sql-server/sql-server-downloads</h3>&l
Tsinghua Optics AI appears in Nature! Physical neural network, backpropagation is no longer needed
Aug 10, 2024 pm 10:15 PM
Using light to train neural networks, Tsinghua University results were recently published in Nature! What should I do if I cannot apply the backpropagation algorithm? They proposed a Fully Forward Mode (FFM) training method that directly performs the training process in the physical optical system, overcoming the limitations of traditional digital computer simulations. To put it simply, it used to be necessary to model the physical system in detail and then simulate these models on a computer to train the network. The FFM method eliminates the modeling process and allows the system to directly use experimental data for learning and optimization. This also means that training no longer needs to check each layer from back to front (backpropagation), but can directly update the parameters of the network from front to back. To use an analogy, like a puzzle, backpropagation
AI blows up physics! Is 21-degree room temperature superconductivity scheduled for the Nobel Prize? Professor Nature withdraws his manuscript but receives investment from OpenAI
Apr 12, 2023 pm 07:04 PM
Have humans achieved room temperature superconductivity at 21°C? The physics circle is completely exploded! Yesterday afternoon, Beijing time, a thunder exploded at the physics conference held in Las Vegas, USA - high-temperature superconductivity was suspected of achieving a disruptive breakthrough. At the meeting, physicist Ranga Dias of the University of Rochester reported this milestone breakthrough in room temperature superconductivity research. If Ranga Dias really achieves room-temperature superconductivity this time, the global energy consumption problem will be solved from the source - humans will use electrical energy to gain tremendous power. If we can fundamentally master controllable nuclear fusion, we can even conduct long-distance space travel. It can be said that mankind will really take off. And those who master this technology will undoubtedly lead the world. (It’s like science fiction coming into reality.)
What is the relationship between cloud server vCPU and physical CPU?
Feb 19, 2024 pm 07:10 PM
The vCPU in a cloud server is a processor that simulates running on the CPU of a physical server. A physical server can usually support multiple vCPU instances, and each instance runs independently. The number of these vCPUs depends on the configuration of the physical server and the cloud service provider's policies. The relationship between vCPU and physical CPU is achieved through time-division multiplexing technology, which means that the time of the physical CPU is divided into multiple time segments, and each segment is allocated to the vCPU of a virtual machine instance. Therefore, the vCPU of a virtual machine instance can only use the time slice assigned to it, not the entire physical CPU. The performance of a vCPU is limited by the underlying physical CPU. For example, a physical server with 4 CPU cores and 8 threads is most
Hard core to solve Sora's physics bug! Four top universities in the United States jointly released: Install a physics engine for the video generator
May 07, 2024 pm 05:01 PM
Some bugs appeared after Sora was released. Users on the Internet discovered some problems. Although the model did not fully understand the physical world, when the puppy was walking, the two front legs would intersect, which was unexpected. game. The interaction of objects is very important for generating video realism, but currently it is still very difficult to synthesize the dynamic behavior of real 3D objects in interaction. Action-conditioned dynamics is a research area that requires the perception of physical material properties of objects and the prediction of 3D motion based on these properties (such as object stiffness). Assessing physical material properties remains a thorny and unsolved problem because measuring physical material properties of real objects is extremely difficult due to lack of data support. Recently, M.I.T.
Introduction to SQL and NoSQL databases in Java language
Jun 10, 2023 pm 07:01 PM
With the development of the Internet, data has become a vital part of businesses and organizations, and managing data has become increasingly complex. In order to effectively manage data, databases have become an essential tool. In the Java language, SQL and NoSQL databases are two common database types. This article will introduce these two database types and their application in Java development. SQL database SQL is the abbreviation of StructuredQueryLanguage. It is a data processing method that uses structured query language.
