mysql insert ignore

INSERT statements is the index cache refresh. If you can use one statement to insert all rows, you do not need to lock them. For transaction TABLES, BEGIN and COMMIT should be used instead of lock tables to speed up insertion. Locking also reduces the overall time for multi-connection testing, although the maximum wait time for them to wait for locking will increase. For example: Connection1does1000in

MySQL batch SQL insert performance optimization details, mysql Performance Optimization For some systems with a large data volume, the database faces problems in addition to the low query efficiency, but also the long data warehouse receiving time. Especially for the report system, the time spent on data import may be several hours or dozens of hours every day. T

Tags: statement customer MYSQ ROM IBM exist span direct useIn MySQL, inserting (insert) A record is simple, but some special applications, before inserting a record, need to check whether the record already exists, only if the record does not exist to perform the insert operation, this article describes the solution of this problem.question: I created a table to

For transaction TABLES, BEGIN and COMMIT should be used instead of lock tables to speed up insertion. Locking also reduces the overall time for multi-connection testing, although the maximum wait time for them to wait for LOCK will increase. For example: Connection 1 does 1000 inserts Connections 2, 3, and 4 do 1 insert Connection 5 does 1000 inserts If no lock is used, 2, 3, and 4 are completed before 1 and 5. If locking is used, 2, 3, and 4 may not

In-depth explanation of mysql concurrent insertion optimization bitsCN.com When using storm to process logs, we often encounter the efficiency problem of inserting mysql concurrently. I checked some information online and made some notes.Change the table engine to myisam,Modify the concurrent_insert = 2 of my. cnf. The value of concurrent_insert can be 0 1 2, and 2 completely supports concurrent inserts.

How to insert random string data in mysql, mysql string Application scenarios:Sometimes it is necessary to test the records inserted into the database, so these scripts are very necessary. Create a table: CREATE TABLE `tables_a` ( `id` int(10) NOT NULL DEFAULT '0', `name` char(50) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8; Create a f

Transferred from: http://www.cnblogs.com/ggjucheng/archive/2012/11/05/2754938.htmlSyntax for insertINSERT [Low_priority | DELAYED | High_priority] [IGNORE] [into] tbl_name [(col_name,...)] VALUES ({expr | DEFAULT},...), (...),... [on DUPLICATE KEY UPDATE col_name=expr, ...] Or: INSERT [low_priority | DELAYED | High_priority] [IGNORE] [into] tbl_name

How do I get the primary key value AutoNumber for the insert data after the MySQL tutorial insert statement? The method is very simple, the MySQL data with the mysql_insert_id (); How to use: Insert INTO (a ') VALUES (' B ') $nid = mysql_insert_id (); Method Two: LAST_

After an article, the final experiment, I was trying to prove the MySQL InnoDB storage engine, the relationship between the commit operation and the flush data to disk, and when communicating with a colleague, he said, you should take the size of innodb_buffer_size into account, In fact, I have to consider, in the beginning part has made assumptions, if the buffer size is 1G, the data size is 2G, then in the transaction

MYSQL batch data insertion implementation code page 1/3, mysql insert code page 3@ Echo offClsSet CLASSPATH = .. \ api \ jogre. jarSet CLASSPATH = % CLASSPATH % ;.Set CLASSPATH = % CLASSPATH %; classesSet CLASSPATH = % CLASSPATH %; lib \ dom4j. jarJava org. jogre. server. JogreServerCreate a tableCopy codeThe Code is as follows:Create database con_test;Use con_te