2wire 3800

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When $ or and sort () are used in MongoDB, the query performance may be poor.

First, let's take a look at the operation process: mongos> db.find({ "user" : "jhon"}).sort({"name" : 1}).limit(100).explain() { "cursor" : "BtreeCursor user_1", "nscanned" : 10100, "nscannedObjects" : 10100, "n" : 100, "scanAndOrder" : true, "millis" : 116, "nYields" : 0, "nChunkSkips" : 0, "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { "user" : [ [

A friend company officially announced a failed start-up

programmers used to live. In this way, two thousand more expenses are incurred each month, and lunch and dinner expenses are reimbursed. When she arrived, it started to get cold last winter. She was unable to get cold at all. In the evening, the Office (living room), the air conditioners in her bedroom were all open, and she often forgot to close the room when she went to bed. In this way, the monthly fixed expenditure is as follows:I (3500) + Program (5000) + drivers (1800) + female planning (

Research and Practice of Cisco Series vro password recovery

monitor running mode> or rommon> Boot field = 0x2 boot normal operation mode from flash 2. Preparations When designing a router product, the manufacturer reserves a console, which is an important interface for vro configuration and the first step for password recovery: connect the terminal or PC with the Super Terminal software to the Console port of the vro by using the db25 forwarding interface and crossover line. The terminal parameter settings are as follows: Speed: 9 600 bps; Data bit: 8;

Database Retrieval statements and Database Retrieval statements

, you can also specify an alias for the calculation results of Aggregate functions and execute the following SQL: Select max (FSalary) as MAX_SALARY FROM T_Employee WHERE FAge> 25. Select avg (FAge) FROM T_Employee WHERE FSalary> 3800. Select sum (FSalary) FROM T_Employee. Select min (FSalary), MAX (FSalary) FROM T_Employee. The last introduced function is the COUNT of the number of records. This function is special because it can be used as a parame

Create a Windows 7 installation USB flash drive in linux

Create a Windows 7 installation USB flash drive in linux Http://blog.csdn.net/pipisorry/article/details/41369821 Linux is installed, and win7 is installed with a USB flash drive (network installation should be acceptable ), First, you must create a win7 installation USB flash drive in linux (ultraiso can be used in windows). It is not possible to directly use the dd command, and the boot information is missing. [In fact, you can also ref]Fdisk, mkfs. ntfs, ms-sys, win7. ISO, and> 4GU disks are r

Spark subverts the sorting records maintained by MapReduce, sparkmapreduce

test results, Spark reduced the sorting time to 23 minutes when 206 EC2 nodes were used. This means that Spark is three times faster than MapReduce in sorting the same data when one tenth is used to calculate resources! In addition, without the official PB sorting comparison, we first pushed Spark to the sorting of 1 PB of data (100,000 billion records. The result of this test is that when 190 nodes are used, the workload is completed in less than 4 hours, it also far exceeds the record that Ya

Travel to Shanghai self-driving water Expo Park

. Shuiboyuan is located at jiangchuan West Road, Minhang District, Shanghai. 3800 Around (basically jiangchuan west road has been open to the west to the end, close to a village called Maqiao pengdu), navigation to search for "jiangchuan West Road" and continue to the west to the end. 2. Note: if it is in the west of shuibo Park, try to avoid pengdu village, because the village has a relatively narrow stone pier, basically, a Passat requires

Funny black screen of Microsoft (Text + image + audio)

1. Dial 800-820-3800 User: Hello, is this Microsoft?Microsoft: Yes. What do you do?User: I saw your announcement a few days ago. Didn't you say you wanted a black screen? I have been waiting for a day. Why is it still black ....Microsoft: # % $ ^ @User: Are you black?Microsoft :.......User: Ah, are you black?Microsoft: Black... the pirated ones are black. Are you pirated?User: Yes, 100% pirated, absolutely pirated.Microsoft: No. By the way, have y

Rommon recovery process of vrouters OF DIFFERENT TYPES

Rommon recovery for the as5200 Series Rommon recovery for the Cisco 4500 and 4700 series routers Rommon recovery for the Cisco 3600/3700/3800 series routers Rommon recovery for the Cisco 2600 series router and the vg200 Rommon recovery for the Cisco 2500,300 0, as5100, and ubr900 series routers Rommon recovery for the Cisco 1700 series router Rommon recovery for the Cisco 1600 series router Rommon recovery for the Cisco 800 series router Rommo

Witness the-share market in China: the bottom-up index of the morning market accelerated by the Shanghai index fell by 129 points, down to 4241.02

multiple negative impacts: The Central Bank said that the tightening policy is not shaken; China's Tie Jian implemented online purchase today, which has an impact on the level-2 market capital; foreign-funded enterprises have further clarified the issue of A shares, this may lead to market expansion pressure. Another factor impacting the market is the "China Unicom refinancing Incident" rumor. Recently,Ping An, China(66.71,-2.71,-3.90%, right),Pudong Development Bank(39.40,-0.58,-1.45%, right)

Introduction to integrated service data application-type Router

systems. Content-based routing: Enables the IT manager to establish a routing model in a graphical manner and transmit data from the source system to one or more target systems in the future. Monitoring: Monitors all history and health status of transactions processed by the application router. Alert Notification: Sends data and connection Error alerts by email or SNMP trap. Enterprises can use application routers to connect two systems for data exchange. Some IT departments need to constantly

POJ3469 & min Cut (maximum flow) template

is one that asks for the smallest cut.SolThe data is large, n has 20000, the internal side of the connection has 20w, so calculate to save eight hundred thousand or nine hundred thousand of the side, the space obviously can't fall down ... However, playing dinic does not feel much faster ... Run to the 3800+ms.Then kneel a big Uncle 2000ms, he only opened 50w side this is how to do qwq ... And then there's no significant difference. He was sealed in a

Network layer----1

means that the length of each shard must be an integer multiple of 8 bytes. Example:The total length of a datagram is 3820 bytes, and its data portion is 3800 bytes (using a fixed header), requiring fragmentation to be a datagram with a length of not more than 1420 bytes. Because the fixed header length is 20 bytes, the data portion of each datagram cannot exceed 1400 bytes in length. It is divided into 3 data sheets, with data part lengths of 1400

Maximum profit Max flow for "BZOJ-1497"

1497: [NOI2006] Maximum profit time limit:5 Sec Memory limit:64 MBsubmit:3800 solved:1848[Submit] [Status] [Discuss] DescriptionThe new technology is hitting the mobile phone market, for the major operators, this is both an opportunity, but also a challenge. Thu Group's Cst Communications company in the new generation of communications technology on the eve of a bloody battle, need to do too much preparation, only to choose one site, you need

Define the Upper Society

sleep on the board bed of a guest house, which, in some people's opinion, is really a rough, physically intolerable quality of life.The true elite, it is by this physiological characteristics, and the new rich class will be separated forever. And when they meet the same people, they can find each other right away.A tricky, secondary school graduate of the Shanghai middle-class housewife. She may not be able to afford a tens of thousands of-dollar pillow at all. She had only two pillows, one for

Crystal/dcxo (Crystal) and Tc-vcxo (crystal oscillator) calibration process

handset is synchronized with the system. The handset's AFC (Auto Frequency control) calibration is divided into two types: one type is crystal and the other is VC-TCXO.⑴. A type of crystal crystal refers to crystalsCalibration process of Crystal AFC;①. Calibrating the CAP ID firstWith the AFC DAC unchanged, a CAP ID is selected between 0-63 (127) and the standard is the minimum frequency offset of its corresponding transmit signal, and then validation of the CAP ID is in the correct range for t

Using redis Cache, the cache key value is a range value (which can be processed). how can I find the corresponding cache when there is a number of zones in the input range?

value can be the value of the array key after any processing. at this time, I input a value of 38000, I want to find the cache value with the key value containing 38000 in the cache. Is there any good solution? Please kindly advise! // If there are many keys in the array but the value is not large, use an ordered set. $ Redis-> zAdd ('key', 10000, 'Shanghai'); $ redis-> zAdd ('key', 20001, 'Beijing '); $ apsaradb for redis-> zAdd ('key', 30201, 'Tianjin '); $ apsaradb for redis-> zAdd ('key'

How should I select the first job as a fresh graduate who is determined to be a product manager?

refused. On the one hand, the intern had never been in touch, and on the other hand, it was a matter of distance. last night, the employee said that the boss was willing to pay a higher salary than any other company. You are welcome to join me. I don't know how to reply .) Product posts A company in Zhongguancun Software Park is close to home. The product manager said that it could take me through a complete process, from preliminary research and planning to post-interaction design, working fiv

Linux network details

loopback running mtu: 3900 Metric: 1 PX packets: 3880 errors: 0 dropped: 0 overrun: 0 frame: TX packets: 3800 errors: 0 dropped: 0 overrun: 0 carrier: 0 Collisions: 0 txqueue: 0 The ifconfig command not only displays network interfaces in the system, but also configures the network through Parameters. the command format is: # Ifconfig interface name IP address netmask subnet mask However, the ifconfig command only changes the TCP/IP network parameter

Seisimager.pickwin.v3.14.with.plotrefa.v2.73-iso 1CD (Seismic prospecting software)

and channel design, terrain modelling and batch calculation)CTech EVS and MVS v6.6 (geographical analysis software. For geologists, marine scholars, archaeologists to analyze geological grounds)DELFT3D.V3.23 (International advanced surface water Environment mathematical simulation and wastewater treatment simulation system)Harbourman v1.06 (surveying software for use in seaports and ports)ixseg2segy.v3.24 (used to read SEG-1, SEG-2, Seg-y, ASCII, CSV, and other measurement vendors multi-channel

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