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1) for tables of the Myisam type, you can import a large amount of data quickly using the following methods. Alter table tblname disable keys;Loading the dataAlter table tblname enable keys;These two commands enable or disable the update of

How to speed up SQL import in MySQL     1. If MySQL has very little data and the memory is large enough, you can prevent data from being sent to the memory disk. Linux: Mount-T ramfs NONE/Ram By default, half of the memory is used. If

Mysql Note 1 bitsCN.com Mysql Note 1 1. disable the query cache. query_cache_size = 0. 2. Innodb tables are saved in the order of primary keys. Therefore, sorting imported data in the order of primary keys can effectively improve the

Problems with insertions When PHP is manipulating large amounts of data, the solution I think of IS as follows Method One: Construct the SQL statement in the Foreach Loop traversal and insert the databaseINSERT into XXX values (xxx,xxx,xxx) Method

The following Article This section describes the implementation of simple and practical Optimization Methods for MySQL databases, including how to regularly analyze and check tables and how to optimize tables on a regular basis, the following is a

Beckham _ mysql table optimization and Beckham _ mysql OptimizationMysql table OptimizationBrief:I. analysis tableIi. ChecklistIii. Optimization tableIv. Table Data Import5. Table lock operationsI. analysis table 1.1. command: ANALYZE

Thinkphp transaction rollback and original PHP transaction rollback instances, thinkphp instances 1. To support transactions in the program, the connected database and data table must support transaction mysql as an example: Database InnoDB supports

Understanding MySQL-index and optimization summary, mysql Index Summary Preface: indexes have a crucial impact on the query speed. Understanding indexes is also the starting point for optimizing database performance. Consider the following: Assume

First understand what is gap lock In InnoDB, there are roughly three types of record-level locks: Record, Gap, and next-keylocks. Simply put, recordlock is to lock a row of records; while gaplock locks records in a range; NEXT-KEYLOCK is the effect

thinkphp transaction rollback processing and the original PHP transaction rollback instance 1. To support transactions within the program, the first connected database and data table must support the transaction MySQL for example: Database InnoDB

Import dataFor MyISAM storage engine tables, you can quickly import large amounts of data in the following waysALTER TABLE tbl_name disable keys; Turn off updates for non-unique indexes on tablesLoading the dataALTER TABLE tbl_name enable keys;If

1. Query, can not use * do not use, try to write full field name. 2. The more indexes are not the better, each table is controlled within 6 indexes. The index does not work in the case of a range where condition, such as where value 3. In most

Today and students to discuss the issue of database transactions, feel the discussion in some understanding, some knowledge has been seen, but no actual use or do not understand. A transaction is a sequence of operations as an atomic operation, or

There are three types of Java transactions: JDBC Transactions, JTA (Java Transaction API) transactions, container transactions. Common container transactions such as spring transactions, container transactions are mainly provided by the Java

Transaction processing in various management systems have a wide range of applications, such as personnel management system, many synchronous database operations need to use transactions. For example, in a personnel management system, you delete a

Preface Creating the right indexes and using them correctly is the key to getting good query performance. We've covered different kinds of indexes and explored their pros and cons. Now let's look at how to use powerful indexes in depth. There are

Reference | Reference Manual | Chinese 4 establish InnoDB table Suppose you have run the MySQL client program as a MySQL test command. In order to create a table in InnoDB format you must specify TYPE = InnoDB in the SQL command: CREATE TABLE

Reference | reference Manual | skills | performance | Chinese InnoDB Chinese reference Manual---Dog dog (heart sail) Translation 9 Performance tuning tips (performance tuning tips) 1. If Unix top or Windows Task Manager shows the service's CPU

The name of the class that implements Java.sql.Driver in MySQL connector/j is ' com.mysql.jdbc.Driver '. The ' Org.gjt.mm.mysql.Driver ' class name is also usable to remain backwards-compatible with MM. Mysql. You are should use this class name when

Advantages: 1. Save delivery time. 2. Concurrent processing. PreparedStatement: 1) Addbatch () adds a set of parameters to the PreparedStatement object. 2) ExecuteBatch () submits a batch of parameters to the database for execution, and returns an