Does empty text occupy space in database

mysql text vs varchar
does null take up space in database

Does empty text(type) occupy space in database ? One column of database table is merely used, if data is inserted in this column, the size will be no more than 2 digit integer. First-fall, I set int(2) for this column, but it kept 0 value even if it is empty. No matter how much, but space is occupied even there is 0 value. Am I right ? So I switch int to text thinking that text field would be empty if no data is inserted. Is my assumption right ? Does empty text occupy space ?

Blank space will take minimal space : i) one bit in the NULL bitmap ii) two bytes for length (which will be zero when NULL.

How much size "Null" value takes in SQL Server, I think empty text = NULL, so yes, it should occupy space. Wait for others. That is what I am thinking about it. In MySQL, stored int a TEXT datatype, an empty (zero length) string is different than a NULL value. A NULL value would require zero bytes of storage, a zero-length string would require two bytes of storage, for the length field.

I think empty text = NULL, so yes, it should occupy space. Wait for others. That is what I am thinking about it.

MySQL: How much space does a NULL field use?, For more predictable performance (and to avoid having high variation of rows per page), I would lean to storing this data in a related table - especially if it is only  Does storing plain text data take up less space than storing the equivalent message in binary? No, never. Your computer already stores the plain text data in the equivalent binary representation. Storing something as plain text versus binary just signals how the computer should interpret that identical binary stream.

yes, Empty means it we are passing a null value. so it take spaces.

In SQL Server specifically, does Varchar(50) take same amount of , From the Innodb Physical Row Structure, bulletpoint #7 under REDUNDANT ROW_FORMAT. An SQL NULL value reserves one or two bytes in  The fact is, a NULL value occupies space – 2 bytes SQL: Using NULL values vs. default values A NULL value in databases is a system value that takes up one byte of storage and indicates that a value is not present as opposed to a space or zero or any other default value.

Does empty text(type) occupy space in database ?

 Yes, it does. But it doesn't contribute to table row size. Text and Blob stored in different area of memory. It contributes only 9-12 bytes.

Though, Different storage engines handle the allocation and storage of this data in different ways in MySQL, according to the method they use for handling the corresponding types.

Int(2) will always occupy 2bytes to hard drive, irrespective of what you store either(0) or max(2^8) and it will contribute 2bytes to table row size.

Why shouldn't we allow NULLs?, Many people chose to use a non-relational ("NoSQL") database (such One of the common questions when using PostgreSQL is around having "empty" fields in a table. Question: Does having null values take up a lot of Disk Space? or Elasticsearch for Full-text Search: https://github.com/dwyl/learn-  It doesn't technically take up any space as it is merely a "container" or "label" used by the operating system. The computer doesn't store items in the same folder actually physically together on

mysql - Does empty text occupy space in database, The different TEXT objects offer a range of storage space from 1 byte to 4 GB and are not stripping bytes when selected, and do not pad unused character space for The following sizes assume the database is using the UTF-8 encoding. If your application does not need to be supported internationally then you should consider just using the VARCHAR, CHAR, and TEXT data type, provided the characters your application uses can be represented using the 1 byte – 256 character set. By using the non-Unicode data types, you will use half the disk space for each character-based column.

Do empty columns take up space in a table?, When you set up a database (at least in MS SQL Server) you can flag a field as allowing NULL values For a text field, the field is either blank "" or has text. In sql server there is a misconception that nulls take up no space. NULL value can occupy in the database based on the coulumn data type and width. Fixed length data type NULL value takes the space as width of filed. (Char (5) – NULL value take 5 bytes) Variable length data type NULL value takes 2 bytes.

Does an empty column value occupy same storage space as a filled , Any space reduction for table data also results in smaller indexes that can be With ROW_FORMAT=REDUNDANT , CHAR( N ) occupies N × the maximum byte if you do not have any variable-length columns ( VARCHAR , TEXT , or BLOB try to keep all data nonredundant (observing what is referred to in database  However, some databases support another approach as well: materialised views. With these, the view's query is executed ahead of time, and the results are stored on disk. Materialised views views do indeed occupy physical space in proportion to the number of rows they contain.

Comments
  • dev.mysql.com/doc/refman/8.0/en/…
  • WIth InnoDB, storage is allocated in pages. If our change allows more rows to fit into each page, then the amount of storage for the table could decrease. But if we are still fitting the same number of rows on a page, then there won't be any impact on the space used by the table.
  • In MySQL, stored int a TEXT datatype, an empty (zero length) string is different than a NULL value. A NULL value would require zero bytes of storage, a zero-length string would require two bytes of storage, for the length field. (The bits for indicating NULL values are reserved in the row header. The number of nullable columns determines the amount of storage reserved for the null indicators, this space is fixed, and doesn't depend on the data stored in the row.)