then what will be the size of my table? do i need 'SUM_OVER_ALL_BTREE_KEYS(max_length_of_key + sizeof(char*) × 4)' as i have only hash keys? thanks in advance :) Shantonu Subject Views Written By Posted How to get size of memory table??
Here is a super simple SQL query to determine the size of all tables in a given database: SELECTTABLE_NAMEAS"Table",round(((data_length+index_length)/1024/1024),2)ASSize_in_MBFROMinformation_schema.TABLESWHEREtable_schema='my_db_name'ORDERBYSize_in_MBDESC ...
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES; +---+ | data | +---+ | 550.82MB | +---+ 1 ...
# 导数命令MYSQL>LOADDATALOCALINFILE'test.csv'INTOTABLEsbtest1FIELDSTERMINATEDBY','LINESTERMINATEDBY'\n'(id,name);# 报错信息ERROR1148(42000):The used command is not allowedwiththisMySQL version 2.3.2 问题分析解决 LOAD DATA LOCAL INFILE导入数据的权限是由参数 local_infile 控制的。在MySQL 5.7中,这...
你也可以使用ALTER TABLE语句的ALGORITHM和LOCK子句来控制DDL操作的某些方面。这些子句放在语句的末尾,用逗号与表和列的规范分隔。例如: alter table ALGORITHM [=] {DEFAULT | INSTANT | INPLACE | COPY} COPY: 这种操作是在原始表的一个副本上进行的,表数据会逐行从原始表复制到新表。在此过程中,不允许进行并...
importpymysqldefget_longblob_size(table_name, field_name, db_config): connection = pymysql.connect(**db_config) cursor = connection.cursor() query =f"SELECT LENGTH({field_name}) FROM{table_name};"cursor.execute(query) size = cursor.fetchone()[0] ...
First at all you must understand that Mysql tables get fragmented when a row is updated, so it's a normal situation. When a table is created, lets say imported using a dump with data, all rows are stored with no fragmentation in many fixed size pages. When you update a variable length...
注意,CHECK TABLE命令在InnoDB数据库中基本上是没有用的。 第三种方法 1、配置my.cnf 配置innodb_force_recovery = 1或2——6几个数字,重启MySQL 2、导出数据脚本 mysqldump -uroot -p123 test > test.sql 导出SQL脚本。或者用Navicat将所有数据库/表导入到其他服务器的数据库中。 注意:这里的数据一定要备份成...
[root@liuyazhuang132 ~]# mysql -uroot -proot lyz < /tmp/lyz.sql [root@liuyazhuang132 ~]# mysql -uroot -proot mysql> use lyz; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql>...
i have an memory table which has 10K rows and uses 2 hash index. I've found in the documentation tht, memory needed for one row is - SUM_OVER_ALL_BTREE_KEYS(max_length_of_key + sizeof(char*) × 4) + SUM_OVER_ALL_HASH_KEYS(sizeof(char*) × 2) + ALIGN(length_of_row+...