data-type-string: Corrections (#11155) (#11256)

pingcap · Nov 10, 2022 · 75c77f5 · 75c77f5
1 parent 16ea532
commit 75c77f5
Showing 1 changed file with 5 additions and 5 deletions.
diff --git a/data-type-string.md b/data-type-string.md
@@ -37,7 +37,7 @@ The space occupied by a single character might differ for different character se
 
 ### `TEXT` type
 
-`TEXT` is a string of variable-length. M represents the maximum column length in characters, ranging from 0 to 65,535. The maximum row length and the character set being used determine the `TEXT` length.
+`TEXT` is a string of variable-length. The maximum column length is 65,535 bytes. The optional M argument is in characters and is used to automatically select the fittest type of a `TEXT` column. For example `TEXT(60)` will yield a `TINYTEXT` data type that can hold up to 255 bytes, which fits a 60-character UTF-8 string that has up to 4 bytes per character (4×60=240). Using the M argument is not recommended.
 
 ```sql
 TEXT[(M)] [CHARACTER SET charset_name] [COLLATE collation_name]
@@ -53,15 +53,15 @@ TINYTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
 
 ### `MEDIUMTEXT` type
 
-The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215.
+The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
 
 ```sql
 MEDIUMTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
 ```
 
 ### `LONGTEXT` type
 
-The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MB.
+The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
 
 ```sql
 LONGTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
@@ -101,15 +101,15 @@ TINYBLOB
 
 ### `MEDIUMBLOB` type
 
-The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215.
+The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
 
 ```sql
 MEDIUMBLOB
 ```
 
 ### `LONGBLOB` type
 
-The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MB.
+The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
 
 ```sql
 LONGBLOB