best database for large data

Self-Study exam results announced, but the superior issued to the registration point is the whole region of the total score zcj.dbf, there are 80多万条 records, more than 50,000 candidates, and we apply for the test only 800 people, how from this "vast sea" in the pick out of our examinee's achievements? Situation Analysis 1. According to the ZCJ.DBF in the field can not distinguish between the registration points. 2. Our entry point candidate's ticket number is not continuous, with additional c

Since the early 80, many computer experts in China have been digging into large enterprises, trying to develop the ideal large-scale mis. Practice has proved that the large number of mis developed, most is not very ideal. Why? According to author further reseach, one of the important reasons is that the database design

Real-time Change (daily) data from a large number of data queries, resulting in loading takes a long time, ask how to optimize For example, the user list has a user A he invited a lot of members a1,a2,a3 ... An, member A1 also invited a lot of members a11,a12,a13 ... A1n A2 invited a lot of members a21,a22,a23,,,,,,,,,,,,,,,,,, a2n and so on a direct member is A1

Import data to Oracle When importing data in Oracle, the file suffix is *. CTL The command is sqlldr. Sqlldr username/password control = 'tbl _ EMP, CTL' Export part of data from postgre Psql Saison-C 'select user_id, user_name from user order by 1, 2 'user_list.txt-a-f,-T Generated file user_list.txt 100001, Xiaoming 100002, Xiaowang CTL File Load

Large data javascripts collect page data and click Stream to send to nginx---->flume Page Javascript: (function () {var cookieutil = {//Get the cookie of the ' key is name Get:function (name) {var cookiename = enc Odeuricomponent (name) + "=", Cookiestart = Document.cookie.indexOf (cookiename), cookievalue = null; if (Cookiestart >-1) {var coo

How to solve the problem of data loss discovered when php post contains a large amount of data This article mainly introduces how to solve the problem of data loss discovered when php post contains a large amount of data, because

bit as the data ages. (If you cache cursors and read very later, you'll be in the few rows of cursor[n+1] ' s block as duplicates of the Last rows of cursor[n] ' s blocks. The intersection cardinality is equal into the number of deletions in Cursor[n] ' s block. Still, there may is value in caching this cursors and then heuristically rebalancing them when the overlap On crosses some threshol

There are many situations in development where you need to export the results of the data displayed in the DataGridView control in Excel or Word, which is what this example does. Since some data columns may not need to be displayed from the database, and the corresponding columns are hidden in DataGridView, the hidden columns are exported when exported, which is

whether other related operations will have an impact. For example, you can improve query performance by creating an index, but this can lead to the insertion of data because the performance of the insert degrades when you want to create an update index, and you can accept this reduction. Therefore, the optimization of the database is to consider a number of directions, looking for a compromise of the best

Java from junior programmer to architect video, document, architecture design, large Web site architecture analysis, big Data analysis data, build high concurrency, high-powered architecture design materials need to contact me. Many catalogs are not listed (there are many catalogs in the QQ Space album) plus qq:1927360914650) this.width=650; "Src=" Http://s2.51ct

NPOI exports a large amount of EXCEL Data, multiple sheet display data, npoisheet // NPOIHelper class key code using System; using System. collections. generic; using System. linq; using System. text; using System. data; using System. IO; using NPOI. HSSF. userModel; using System. collections; using System. web; namesp