AUTO: Sync ScalarDB docs in English to docs site repo

Author: josh-wong

docs/configurations.mdx

@@ -94,6 +94,8 @@ Select a database to see the configurations available for each storage.
     | `scalar.db.jdbc.admin.connection_pool.min_idle`            | Minimum number of idle connections in the connection pool for admin.                                                                                                                                                                                | `5`                          |
     | `scalar.db.jdbc.admin.connection_pool.max_idle`            | Maximum number of connections that can remain idle in the connection pool for admin.                                                                                                                                                                | `10`                         |
     | `scalar.db.jdbc.admin.connection_pool.max_total`           | Maximum total number of idle and borrowed connections that can be active at the same time for the connection pool for admin. Use a negative value for no limit.                                                                                     | `25`                         |
+    | `scalar.db.jdbc.mysql.variable_key_column_size`            | Column size for TEXT and BLOB columns in MySQL when they are used as a primary key or secondary key. Minimum 64 bytes.                                                                                                                              | `128`                        |
+    | `scalar.db.jdbc.oracle.variable_key_column_size`           | Column size for TEXT and BLOB columns in Oracle when they are used as a primary key or secondary key. Minimum 64 bytes.                                                                                                                             | `128`                        |
     | `scalar.db.jdbc.oracle.time_column.default_date_component` | Value of the date component used for storing `TIME` data in Oracle. Since Oracle has no data type to only store a time without a date component, ScalarDB stores `TIME` data with the same date component value for ease of comparison and sorting. | `1970-01-01`                 |
 
 :::note

docs/schema-loader.mdx

@@ -552,12 +552,12 @@ TIMESTAMP represents a date-time without time zone information, while TIMESTAMPT
 
 :::
 
-However, the following data types in JDBC databases are converted differently when they are used as a primary key or a secondary index key. This is due to the limitations of RDB data types.
+However, the following data types in JDBC databases are converted differently when they are used as a primary key or a secondary index key. This is due to the limitations of RDB data types. For MySQL and Oracle, you can change the column size (minimum 64 bytes) as long as it meets the limitation of the total size of key columns. For details, see [Underlying storage or database configurations](configurations.mdx#underlying-storage-or-database-configurations).
 
-| ScalarDB | MySQL/MariaDB | PostgreSQL/YugabyteDB | Oracle       |
-|----------|---------------|-----------------------|--------------|
-| TEXT     | VARCHAR(64)   | VARCHAR(10485760)     | VARCHAR2(64) |
-| BLOB     | VARBINARY(64) |                       | RAW(64)      |
+| ScalarDB | MySQL/MariaDB  | PostgreSQL/YugabyteDB | Oracle        |
+|----------|----------------|-----------------------|---------------|
+| TEXT     | VARCHAR(128)   | VARCHAR(10485760)     | VARCHAR2(128) |
+| BLOB     | VARBINARY(128) |                       | RAW(128)      |
 
 The following data types have a value range and precision regardless of the underlying database.