Class: TMMUpdater
property MaxBatchBytes : Integer;Maximum POST body size per batch in bytes. Default: 512 KB.
Rows accumulate until the serialised size would exceed this value, then
are sent in a single batch request. When still at the default 512 KB,
Prepare auto-derives a value from the server limits
(post_max_size, max_allowed_packet) after a
successful TestConnection. Set explicitly to override.