firebird database performance comparison

; Cmd.commandtext = strSQL; OleDbDataReader reader; Open connection Try { Cnn.open (); } catch (Exception ERR) { Strerr = Err.message; return false; } byte[] pixels = new Byte[numpixels]; Long readcount = 0; reader = cmd. ExecuteReader (); Process-by-article while (reader. Read ()) { for (long i = 0; i{ Readcount = reader. GetBytes (6,i,pixels,0,numpixels); if (readcount = 0) { Break } else if (Readcount = = numpixels) { Processimagedata (ref pixels); } Else { Byte[]buff = new Byte[readcount]; P

from Forum.likes likes, forum.forumposts Posts, Forum.forummembers memberswhere likes.memberid=posts.ownerid and posts.replyto= Likes.postid and members.memberid=likes.memberidIt seems that this writing is more difficult to understand and read.Replies to members of multiple postsSELECT Members.memberid, Members.membername, as Total From dbo. Forumposts replypost, reply_to, dbo. Forumposts repliedpost, written_by,dbo. Forummembers members WHERE MATCH (members

Over the past few days, I have discussed the popularity of ORM performance, and it is even a bit of gunpowder. It is said that our ORM is good and the performance is high. Of course, the best thing we use is the best. We also want to do better without it. The newlife group has a MB SQLite database. Many people have concerns about the

will not consider the database design too much early on, but rather as soon as possible to complete the implementation and delivery of the function, and so on the project has a certain amount of traffic, hidden problems will be exposed, then to modify it is not so easy.2. Database deploymentThe OPS engineer is on the pitch, and the initial number of visits will not be large, so a single deployment is suffi

There are many methods to access the Oracle database using Visual Basic, and each method has its advantages and disadvantages. You can select the method that best suits your work environment. First, you must understand what these methods are. In this article, we will introduce some common methods for accessing Oracle databases, give a brief overview of each method, and compare the technologies and features of each method, hoping to provide readers wit

Tags: high key value concurrent traditional images concurrency method database transaction ProcessingFirst, relational databaseThe most typical data structure of a relational database is a table, which consists of a two-dimensional table and the linkage between them.Advantages:1, easy to maintain: all use the table structure, the format is consistent;2, easy to use: SQL language Common, can be used for comp

This article mainly introduces the Database Connection Methods in php, pdo and mysqli, which have been compared and analyzed in various aspects. It is very comprehensive. We recommend this article to you and you can refer to it as needed. This article mainly introduces the Database Connection Methods in php, pdo and mysqli, which have been compared and analyzed in various aspects. It is very comprehensive.

Comparison of features of three common storage engines in MySQL database The storage engine of MySQL may be the most distinctive of all relational database products, not only can multiple storage engines be used at the same time, in addition, plug-ins are used between each storage engine and MySQL. Because the features of various storage engines vary greatly, thi

Analysis and comparison of five MySQL database reliability solutions this article mainly analyzes and compares the reliability solutions of five MySQL databases from the basic information, costs, advantages and disadvantages, and application scenarios, in addition, this article provides some reference for MySQL database development and management. For details, re

Analysis and comparison of five MySQL database reliability solutions bitsCN.com this article mainly analyzes and compares five MySQL reliability solutions in detail in terms of basic information, costs, advantages and disadvantages, and application scenarios., in addition, this article provides some reference for MySQL database development and management. For det

filtering conditions are relatively fixed. each request has a small amount of data and you do not want to perform horizontal Sharding on your own. Best practicesMake the query as simple as possible to avoid data transmission across nodesTo meet the computing performance of SQL nodes as much as possible. a larger cluster SQL node will obviously have redundant Data nodes.Use the 10-ge network environment to connect nodes to reduce the latency of data t

The comparison and usage of sorting in PHP and MySQL databases are the main content we will introduce in this article. Generally, the execution efficiency needs to consider the load of CPU, memory and hard disk, assuming that both the MySQL server and the PHP server have been configured in the most appropriate way, the system is scalable... "> The comparison and usage of sorting in PHP and MySQL databases a

This article mainly from the basic situation, cost, advantages and disadvantages and applications, and other aspects of the 5 MySQL reliability scheme for a detailed analysis and comparison, in addition, the MySQL database for the development and management of a certain reference role. For more information, please refer to the following: 　　1. MySQL Clustering (Ndb-cluster stogare) 　　Brief introduction: T

Tags: storage space statistics Delete efficiency blog Bottleneck ora update fileHBase vs. Oracle comparison (column and row database)1 Main differences HBase is suitable for a large number of insertions and read cases The bottleneck of HBase is hard drive transfer speed , and Oracle's bottleneck is hard drive seek time . Hbase essentially has only one operation, which is insert, whose upda

Assuming that both the MySQL server and the PHP server are configured in the most appropriate way, the system's scalability (Scalability) and user-perceived performance (user-perceived performance) are the main goals we pursue. In the actual operation, the data in MYSQL is often stored in memory in the form of HASH tables, BTREE and so on, the operation speed is very fast, and index has been pre-sorted; In

In this way, even after the required data is queried, it will still perform a full table scan for the remaining data, which wastes a lot of resources and program time. You can use top 1 to restrict conditions: SELECT TOP 1 * FROM News WHERE NewsId=@NewsId Suppose there are 1 million data records, and newsid = 1 in practice, we save the time to query 999999 data records. In general, the news table will be large, but there will be very few newscate. For the two tables with very disparity in

This article mainly introduces the database connection methods in php, pdo and mysqli, which have been compared and analyzed in various aspects. it is very comprehensive. we recommend this article to you and you can refer to it as needed. 1) overall comparison PDO MySQLi Database support Support for 12 different datab

balancing. The two have the same principle. The difference is that dynamic algorithms only process dynamic data, for example, data migration is triggered only when data is rewritten, which does not work for static data. However, static algorithms can balance static data. When a background task finds a low-loss static data block, migrate it to other database blocks and place these blocks in the idle pool for use. From the perspective of the balanced e

Analysis and comparison of five MySQL database Reliability Solutions (3) advantages: High Reliability; A certain degree of redundancy; In the name of high reliability, it is scalable. Disadvantages: No server load balancer Unguaranteed redundancy No scalability in writing load Speed: Reading and writing is equivalent to a separate server. Application scenarios Highly reliable and read-intensive

perform a large number of insert or update operations in your app, you should use InnoDB, which can improve the performance of multiple user concurrency operations. Common commands:(1) View the storage type of table (three kinds):Show CREATE TABLE tablenameShow Table status from DBName where Name=tablenamemysqlshow-u user-p password--status dbname tablename(2) Modify the table's storage engine:ALTER TABLE TableName TYPE=INNODB(3) Add the following pa