引用自Stack Overflow:[How to increase varchar column size in MySQL?](
innodb_log_buffer_size=16M #binlog的截止大小,碰到较大事务的时候,比如事务本身的log为100M,这时候,当前binlog是不会被截断的,也就是说这个binlog的size比100M要大 max_binlog_size = 50M #这两个参数规定了事务未提交时的binlog缓冲区大小,binlog_cache_size占用内存空间,为每一个session分配2M大小 #不...
Thenamecolumn is of datatypevarcharand size5. To increase the size of the column, we shall run the following SQL Query. </> Copy ALTER TABLE students MODIFY name VARCHAR(30); Now, let us see the modified schema if the column size has updated. The column size has been successfully updat...
mysql>createtabletest(->test_varchar_maxvarchar(65535)notnulldefault''comment'测试varchar最大值'->...
insert_values,';');PREPAREstmtFROM@sql;EXECUTEstmt;SET@sql=CONCAT('INSERT INTO category_info_varchar_500 (name, is_show, sort, deleted, create_time, update_time) VALUES', insert_values,';');PREPAREstmtFROM@sql;EXECUTEstmt;SETend_idx=LEAST(total, start_idx+batch_size-1);ENDWHILE;END$$...
#65533+2个字节变长字段长度+1NULL值标识createtablevachar_size_demo(cvarchar(65533)notnull)ROW_FORMAT=compact; 两者原理和Compact类似,不同之处在于对上面行格式溢出的处理。 Compact:对于行溢出的行格式数据存储一部分到其他页中。 Dynamic:行溢出的数据全部移到另外一个溢出页中,然后用个指针...
You are using the MEMORY (HEAP) storage engine; in this case you need to increase the value of the max_heap_table_size system variable. See Server System Variables. 字段数量和数据行大小的限制 字段数量限制 MySQL 中每个表最多包含 4096 个字段,不过实际上的字段数量限制比这个值更小。这个限制取决...
This method sets the blob part size of a blob column—that is, the number of bytes to store in each tuple of the blob table. This method is applicable to blob columns only. Changes made to columns using this method are not visible to MySQL. You can increase the blob part size of...
If you are using a KDF, which you can from MySQL 8.0.30,key_strcan be any arbitrary information such as a password or passphrase. In the further arguments for the function, you specify the KDF name, then add further options to increase the security as appropriate for the KDF. ...
Error 1038 (HY001): Out of sort memory, consider increasing server sort buffer size。 排查 当我把order by排序去掉,语句就正常返回了,这说明是排序的时候出了问题。 询问了chatgpt表示是sort_buffer_size设置过小的原因,所以我就看了下自己的sort_buffer_size大小: ...