best database for large data

Recently there is a table (with the varchar (max) field) that takes up 240G of space and the space is not released after hundreds of thousands of of the historical data has been deleted. Then use DBCC CLEANTABLE (0,TB_NAME,100) to release the space left by the variable-length field after deleting the record, noting that the third parameter is the number of rows per transaction, It is strongly recommended that the default is 0 and the entire operation

First, the export database with the mysqldump command (note the MySQL installation path, that is, the path of this command):1. Export Data and table structure:Mysqldump-u User name-p password database name > database name. sql#/usr/local/mysql/bin/mysqldump-uroot-p ABC > Abc.sqlPrompt for password after knocking in ret

If you submit multiple records to the database server at one time, the INSERT command is usually executed multiple times, so that you can execute a round-trip with the database server for each record to be inserted, this puts more pressure on the server and greatly reduces the efficiency.... NET Framework 2.0 new feature bulk copyA large amount of

CMDS system Database Source-side large table Data Update optimizationThe following script can be used to partition a table according to the ROWID range to obtain a specified number of ROWID extent intervals (Group sets of rows in the table into smaller chunks) so that non-partitioned tables use ROWID for parallel Delete or update```REM rowid_ranges should be at l

(file), (int) file.length ()); There are three kinds of overloaded formsPs.setbinarystream (2, new FileInputStream (file), (int) file.length ()); There are three kinds of overloaded formsThese two methods are only the second overloaded form of the MySQL jar package implemented, the other two are not implemented, it is an abstract method, so if you use these two methods will prompt the abstract method errorThere is also if the upload, prompt java.lang.OutOfMemoryError, then the virtual machine m

[MySQLFAQ] series-how to deploy master databases with large data volumes from the slave database 1. initialize empty databases 2. start replication and ignore common errors. # Slave-skip-errors = 1062 3. back up big tables one by one. when backing up large tables, you can export them in batches to facilitate concu

Assume that I downloaded a database from the Internet or an SQL export file and used DatabaseMigration of Yii2 to import data. Is this solution feasible? Assume that I downloaded a database from the Internet or an SQL export file and used DatabaseMigration of Yii2 to import data. Is this solution feasible? Reply con

Only know SQL Server support data Bulk INSERT, but Oracle, SQLite and MySQL are also supported, but Oracle needs to use the Orace.dataaccess driver, today put out several database of BULK INSERT solution. First of all, Iprovider has a plug-in service interface Ibatcherprovider for bulk inserts, which has been mentioned in the previous article. One, SQL Server

Haier customer information management system SQL Injection multi-database (SA permission, large volume of sensitive data) Haier customer information management system SQL Injection multi-database (SA permission, large volume of sensitive

Source data (text files) A large amount of historical stock data has been downloaded in the text format: The first line of each file contains shares.Code, Stock name, data type. The second row is the name of the data column: Dat