mysql temp table performance

record2) MySQL limit statement is very convenient, but for many records of the table is not suitable for direct use.2. Performance optimization approach to limit paging problemSpeed up paged queries with table overlay indexesAs we all know, if you only include that index column (overwriting index) in the statement tha

records of the table is not suitable for direct use.2. Performance optimization approach to limit paging problemSpeed up paged queries with table overlay indexesAs we all know, if you only include that index column (overwriting index) in the statement that uses the index query, then this will query quickly.Because the index is used to find the optimization algor

, 10000 to start the paging execution time (20 per page), as follows:SELECT * FROM Product limit 10, 20 0.016 secondsSELECT * FROM product limit 100, 20 0.016 secondsSELECT * FROM product limit 1000, 20 0.047 secondsSELECT * FROM Product limit 10000, 20 0.094 secondsWe have seen that as the start record increases, the time also increases, which means that the paging statement limit is very much related to the starting page number, then we change the start record to 40w (that is, the average of r

How much data is stored in a mysql table is the highest performance. I have never known how many rows of data are stored in the InnoDB table. www.2cto.com asked some people, but they were still inconclusive. the DBA of one of the largest e-commerce companies in China gave me a rough answer and I felt reliable. So I wil

file. That is, if the database fails, the data saved in the staging table cannot be recovered. For this reason, the database administrator has to re-execute some jobs to regenerate the data in the staging table. The benefit is that DML operations for temporary tables can be very fast-blocking. In addition to the other causes of performance improvements, it is al

look at 10, 100, 1000, 10000 to start the paging execution time (20 per page), as follows:select*fromproductlimit10,20 0.016 seconds Select*from productlimit100,20 0.016 seconds select*fromproduct limit1000,20 0.047 seconds select*fromproductlimit10000, 20 0.094 seconds We have seen that as the start record increases, the time also increases, which means that the paging statement limit is very much related to the starting page number, then we change the start record to 40w (that is, the aver

How much data is stored in a mysql table is bitsCN.com with the highest performance Mysql has the highest performance when storing data in a table. I have never known how many rows of data are stored in the InnoDB

Limit 1000, 0.047 seconds SELECT * from product limit 10000, 0.094 seconds We've seen that as the starting record increases, the time increases, which means that the paging statement limit with the starting page number, so we change the start record to 40w (that is, the general record) SELECT * from Product limit 400000, 20 3.229 seconds. And look at the time we took the last page of records.SELECT * FROM Product limit 866613, 20 37.44 seconds No wonder search engines often report time

??? I have never known how many rows of data are stored in the InnoDB table, which is the highest performance ??? So I asked some people, and I was not final. The DBA of one of the largest e-commerce companies in China gave me a rough answer, and I felt reliable. So I will share it with you here .???? 1. A Chinese ox wrote the following :???? Note ? ? ? I have never known how many rows of data are stored i

MySql Performance Tuning (3) Table Design I. first introduce several concepts:1. full function dependency: in the relational mode R (U) of the property set U, if X-> Y, and for any real subset of X ', if both have x' 2. Pass function dependency: In R (U), if X-> Y, Y-> Z, Z is called the transfer function dependency of X. Ii. Paradigm Relational databases ha

Tags: MySQL performance tuning four quick modify table structure1. Modifying the varchar type To meet the requirements, the varchar (6) is now converted to varchar (8). The better approach is not to use altertable modify, but instead take the following steps: A Create a temporary table and set the varchar to varcha

Tags: MySQL performance tuning three-table designA First introduce several concepts: 1. Full function dependency: In the relationship mode R (U) on the attribute set U, if x->y, and for any one true subset X ' of X ', there is X ' ≠>y, then Y is dependent on the X full function. 2. Transfer function dependency: in R (U), if x->y,y->z, the Z-to-X transfer functio

Tags: temporary table big_tablesFind out that the temporary table created in MySQL is basically a disk staging table, which you can troubleshoot. Finally, a description of the temporal table mechanism.By looking at the MySQL statu

Label:Specific statementsSELECT dfm.id, dfm.member_code, dfm.member_name, dfm.recommend_code, Dfm.member_rank, Dfm.create_time, Dfm.account, dfm.have_account, dfm.member_img, dfmr.rank_name, Dfmr.grade_commission_ratio, Dfm1.member_name as Recommendname from d_fx_member DFM left JOIN D _fx_member_rank dfmr on dfm.member_rank = Dfmr.rank left joins D_fx_member dfm1 on dfm.recommend_code = Dfm1.member_co De WHERE dfm.member_code = ' zqy04 ' Human Moon Myth: This has no effect as long

Next MySQL database performance optimization two Horizontal partitioning of a table If a table has too many records, such as thousands, and needs to be searched frequently, then we need to be fragmented. If I split into 100 tables, then there are only 100,000 records per table