mysqldump

背景 今天群里有人问mysqldump出来的insert语句，是否可以按每 10 row 一条insert语句的形式组织。 思考1: 参数--extended-insert 回忆过去所学: 我只知道有一对参数 --extended-insert(默认值) 表示使用长 INSERT ，多 row 在合并一起批量 INSERT，提高导入效率 --skip-extended-insert 一行一个的短INSERT 均不满足群友需求，无法控制按每 10 row 一条 insert 语句的形式组织。 思考2: “避免大事务” 之前一直没有考虑过这个问题。这个问题的提出，相信主要是为了“避免大事务”。所以满足 insert 均为小事务即可。 下面，我们来探讨一下以下问题: 什么是大事务？ 那么 mysqldump 出来的 insert 语句可能是大事务吗？ 什么是大事务？ 定义:运行时间比较长，操作的数据比较多的事务我们称之为大事务。 大事务风险： 锁定太多的数据，造成大量的阻塞和锁超时，回滚所需要的时间比较长。 执行时间长，容易造成主从延迟。 undo log膨胀 避免大事务:我这里按公司实际场景，规定了，每次操作/获取数据量应该少于5000条，结果集应该小于2M mysqldump出来的SQL文件有大事务吗？ 前提，MySQL 默认是自提交的，所以如果没有明确地开启事务，一条 SQL

I have had some experience with optimizing the my.cnf file but my database has around 4 million records (MyISAM). I am trying to restore from a mysqldump but every time I do I eventually get the dreaded "Repair With Keycache", that may take days. Is there any way to get past this and let it roll as "Repair By Sorting"? I have 2GB RAM, Dual Cores, lots of extra hard-drive space. Snip out of my.cnf: set-variable = max_connections=650 set-variable = key_buffer=256M set-variable = myisam_sort_buffer_size=64M set-variable = join_buffer=1M set-variable = record_buffer=1M set-variable = sort_buffer

How do I instruct mysqldump to backup with column names in insert statements? In my case I didn’t a normal back up with insert sql’s resulting in LOCK TABLES `users` WRITE; /*!40000 ALTER TABLE `users` INSERT INTO `users` VALUES (1 structure. Now I went ahead and removed a column from the schema in users. After this when I run the backup sql’s I get a column number mismatch error . To fix this how do I go about instructing mysqldump to write column names too? Here is how I do it now mysqldump --host=${dbserver} --user=${dbusername} --password=${dbpassword} \ --no-create-db --no-create-info -

I've a MySQL 5.0.84 running in a Slackware 13.0 Staging server and wanted to copy a single table to another server which was built to use Ubuntu 14.04 OS for some other testing. I've taken a mysqldump of that table and copied to the testing server . I get the following error when I try to restore the dump file. ERROR 1231 (42000):Variable 'character_set_client' can't be set to the value of 'NULL' Please help me how to fix this error. Thanks! I did some search in internet and fixed it finally. Added the following text at the beginning of the mysqldump file and the restore was successful. /*

I am trying to do a mysql dump of a few rows in my database. I can then use the dump to upload those few rows into another database. The code I have is working, but it dumps everything. How can I get mysqldump to only dump certain rows of a table? Here is my code: mysqldump --opt --user=username --password=password lmhprogram myResumes --where=date_pulled='2011-05-23' > test.sql Just fix your --where option. It should be a valid SQL WHERE clause, like: --where="date_pulled='2011-05-23'" You have the column name outside of the quotes. You need to quote the "where" clause. Try mysqldump --opt -

I'm confused how to import a SQL dump file. I can't seem to import the database without creating the database first in MySQL. This is the error displayed when database_name has not yet been created: username = username of someone with access to the database on the original server. database_name = name of database from the original server $ mysql -u username -p -h localhost database_name < dumpfile.sql Enter password: ERROR 1049 (42000): Unknown database 'database_name' If I log into MySQL as root and create the database, database_name mysql -u root create database database_name; create user

I have database on a server with 120 tables. I want to clone the whole database with a new db name and the copied data. Is there an efficient way to do this? $ mysqldump yourFirstDatabase -u user -ppassword > yourDatabase.sql $ mysql yourSecondDatabase -u user -ppassword < yourDatabase.sql mysqldump -u <user> --password=<password> <DATABASE_NAME> | mysql -u <user> --password=<password> -h <hostname> <DATABASE_NAME_NEW> Like accepted answer but without .sql files: mysqldump sourcedb -u <USERNAME> -p<PASS> | mysql destdb -u <USERNAME> -p<PASS> In case you use phpMyAdmin Select the database you

So I can export only a table like this: mysqldump -u root -p db_name table_name > table_name.sql Is there any way to export only a portion of a table with mysqldump? For example, 0 - 1,000,000 rows, 1,000,000 - 2,000,000 rows, etc. Should I do this with mysqldump or a query? Neo mysqldump -uroot -p db_name table_name --where='id<1000000' or you can use SELECT * INTO OUTFILE 'data_path.sql' from table where id<100000 noisex mysqldump --skip-triggers --compact --no-create-info --user=USER --password=PASSWORD -B DATABASE --tables MY_TABLE --where='SOME_COLUMN>=xxxx' > out.sql The file dumped is