max number of records can MariaDB support

Limitations on Schema

• InnoDB tables can have a maximum of 1,017 columns. This includes virtual generated columns.
• InnoDB tables can have a maximum of 64 secondary indexes.
• A multicolumn index on InnoDB can use a maximum of 16 columns. If you attempt to create a multicolumn index that uses more than 16 columns, MariaDB returns an Error 1070.

Limitations on Size

• With the exception of variable-length columns (that is, VARBINARY, VARCHAR, BLOB and TEXT), rows in InnoDB have a maximum length of roughly half the page size for 4KB, 8KB, 16KB and 32KB page sizes.
• The maximum size for BLOB and TEXT columns is 4GB. This also applies to LONGBLOB and LONGTEXT.
• MariaDB imposes a row-size limit of 65,535 bytes for the combined sizes of all columns. If the table contains BLOB or TEXT columns, these only count for 9 - 12 bytes in this calculation, given that their content is stored separately.
• 32-bit operating systems have a maximum file size limit of 2GB. When working with large tables using this architecture, configure InnoDB to use smaller data files.
• The maximum size for the combined InnoDB log files is 512GB.
• With tablespaces, the minimum size is 10MB, the maximum varies depending on the InnoDB Page Size.

Page Sizes

Using the innodb_page_size system variable, you can configure the size in bytes for InnoDB pages. Pages default to 16KB. There are certain limitations on how you use this variable.

• MariaDB instances using one page size cannot use data files or log files from an instance using a different page size.
• When using a Page Size of 4KB or 8KB, the maximum index key length is lowered proportionately.

You can read a little bit more in the official documentation