compression

compression= { zlib | none }

TCPIP, TLS, HTTP, HTTPS

For UltraLite, no compression is used by default.

For dbmlsync, zlib compression is used by default.

Caution

In SQL Anywhere clients, if you turn off compression the data is completely unobfuscated; if security is an issue, you should encrypt the stream.

See Transport-layer security.

When you use zlib compression, you can configure the upload and download compression using the zlib_download_window_size option and zlib_upload_window_size option. Using these options, you can also turn off compression for either the upload or the download.

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.

The following option sets compression for upload only, and sets the upload window size to 9:

"compression=zlib;zlib_download_window_size=0;zlib_upload_window_size=9"

compression

Syntax

Available protocols

Default

Caution

Remarks

See also

Example