zlib_upload_window_size=window-bits

• TCPIP, TLS, HTTP, HTTPS

12 on mobile operating systems, 15 on desktop operating systems

To turn off compression for uploads, set the window size to 0. Otherwise, the window size can be a value between 9 and 15 inclusive. In general, better compression rates can be achieved with a higher window size, but more memory is required.

window-bits is the base two logarithm of the window size (the size of the history buffer). The following formulas can be used to determine how much memory is used on the client for each window-bits:

upload (compress): memory = 2(window-size + 3)

download (decompress): memory = 2(window-size)

When linking your application directly against the static UltraLite runtime, call ULEnableZlibSyncCompression( sqlca ) to link the zlib functionality directly into your application. Otherwise, mlczlib12.dll must be deployed.

For information about how to set network protocol options with dbmlsync, see CommunicationAddress (adr) extended option.

For information about how to set network protocol options with UltraLite, see Network protocol options for UltraLite synchronization streams.

• compression
• zlib_download_window_size

The following option sets compression for download only:

"compression=zlib;zlib_upload_window_size=0"