/*** 主表索引同步子表* @param masterTableName 主表名* @return*/private Boolean syncAlterConfigIndex(String masterTableName) {String table = masterTableName + "%";//获取子表名List<String> tableInfoList = configExtMapper.getTableInfoList(table);if (tableInfoList.isEmpty()){return false;}...
控制字段长度:在设计表的字段的时候,根据业务需求,尽量控制字段的长度空间不浪费,比如存储身份证号的字段不超过18个字符,手机号的字段不超过11位。 控制字段类型:根据mysql提供的字段类型特性,来选择合理的字段类型存储业务数据,比如存状态0和1使用boolean类型而不使用字符类型CHAR(1)。 尽量满足表设计的三大范式,建立...
MySQL中,Boolean只是 tinyint(1) 的别名,也就是说,MySQL中并没有真正的bool类型。而SQLAlchemy生成SQL的时候并没有检测到 这一点,这就导致一个问题,当使用 bool 类型作为查询条件时,用不上索引,从而导致扫表的行为: > SELECT COUNT(*) FROM message WHERE message.is_national = 1 AND message.updated_at ...
We captured 15 minutes of production traffic on the production primary database server to the slow query log by setting long_query_time=0, then filtered the writes out of the log using an in-house tool (we want to make some progress with read performance before addressing writes), and th...
Type Boolean Default Value ON The value of this variable is ON or OFF to indicate whether the Performance Schema is enabled. By default, the value is ON. At server startup, you can specify this variable with no value or a value of ON or 1 to enable it, or with a value of OFF or...
BOOLEAN TINYINT CHARACTER VARYING(M) VARCHAR(M) FIXED DECIMAL FLOAT4 FLOAT FLOAT8 DOUBLE INT1 TINYINT INT2 SMALLINT INT3 MEDIUMINT INT4 INT INT8 BIGINT LONG VARBINARY MEDIUMBLOB LONG VARCHAR MEDIUMTEXT LONG MEDIUMTEXT MIDDLEINT MEDIUMINT NUMERIC DECIMALData type mapping occurs at table creation ...
int(m)里的m是表示SELECT查询结果集中的显示宽度,并不影响实际的取值范围,规定了MySQL的一些交互工具(例如MySQL命令行客户端)用来显示字符的个数。对于存储和计算来说,Int(1)和Int(20)是相同的 BOOL,BOOLEAN:布尔型,是TINYINT(1)的同义词。zero值被视为假,非zero值视为真4.2...
| Database | +---+ | information_schema | | mysql | | performance_schema | | sys | +---+ 4 rows in set (0.00 sec)mysql> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
{HOSTPATH} type: DirectoryOrCreate # - name: mysql-conf # configMap: # name: mysql-conf # items: # - key: my.cnf # path: my.cnf # 方式2,持久化nfs存储卷 volumeClaimTemplates: - metadata: name: data labels: app: {APP_NAME} type: standalone spec: accessModes: - ReadWriteOnce ...
How to repeat: create table with a boolean datatype b(1) enter some data.. change the boolean value in workbench an error will show Suggested fix: remove the single quote for the boolean value example in my case: UPDATE `mytable`.`user_profilelikes` SET `deleted`='1' WHERE `id`='...