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why cant i set varchar to be 1000 in length


why cant i set varchar to be 1000 in length

By : sumitprat
Date : October 16 2020, 11:12 AM
it helps some times Depends what version of MySQL you are running, before 5.0.3 there was a 255 character limit for varchar:
code :


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Is there any difference between varchar(10) and varchar(1000) when we store string whose length is less than 10?

Is there any difference between varchar(10) and varchar(1000) when we store string whose length is less than 10?


By : Blue Minnow
Date : March 29 2020, 07:55 AM
hop of those help? This depends entirely on the DBMS engine being used. SQL itself does not mandate how things are stored physically, just how they're seen logically.
For example, your DBMS may allocate space in the row for the maximum size, plus some extra bytes to store the length. In that case, there would be a big difference between varchar(10) and varchar(1000) since you would waste quite a bit of space per row.
Java Hibernate creates db table with Varchar(255), how to increase to Varchar(1000)?

Java Hibernate creates db table with Varchar(255), how to increase to Varchar(1000)?


By : Tony Lei
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I want to increase the 255 to 1000 when the table is automatically created by Java Hibernate, but how to do this? , Why not trying simply
@Column(columnDefinition="varchar(1000)")?
Does changing a column length from varchar 18 to varchar 8 improve search speed drastically?

Does changing a column length from varchar 18 to varchar 8 improve search speed drastically?


By : anstragal
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Not drastically. Search speed in B+-tree indexes varies as the number of index reads, which varies with logx(N), where N is the number of index entries and x is the number of keys per index block, which in turn is inversely proportional to their length. You can see it is a sub-linear relationship.
MySQL - storage in varchar for length 1000

MySQL - storage in varchar for length 1000


By : user3751890
Date : March 29 2020, 07:55 AM
this one helps. Consider using a different data type, eg TEXT can store up to 65535 characters. A good alternative for storing notes.
See: What is the MySQL VARCHAR max size?
MySQL VARCHAR(255) UTF8 is too long for key, but max length is 1000 bytes

MySQL VARCHAR(255) UTF8 is too long for key, but max length is 1000 bytes


By : ZooGoer
Date : March 29 2020, 07:55 AM
it fixes the issue If you're using utf8mb4, and you have unique indexes on varchar columns that are greater than 191 characters in length, you'll need to turn on innodb_large_prefix to allow for larger columns in indexes, because utf8mb4 requires more storage space than utf8 or latin1. Add the following to your my.cnf file.
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