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docinfo
Document attribute values (docinfo) storage mode. Optional, default is 'extern'. Known values are 'none', 'extern' and 'inline'.
Docinfo storage mode defines how exactly docinfo will be
physically stored on disk and RAM. “none” means that there will be
no docinfo at all (ie. no attributes). Normally you need not to set
“none” explicitly because Sphinx will automatically select “none”
when there are no attributes configured. “inline” means that the
docinfo will be stored in the .spd file,
along with the document ID lists. “extern” means that the docinfo
will be stored separately (externally) from document ID lists,
in a special .spa file.
Basically, externally stored docinfo must be kept in RAM when querying. for performance reasons. So in some cases “inline” might be the only option. However, such cases are infrequent, and docinfo defaults to “extern”. Refer to the section called “Attributes” for in-depth discussion and RAM usage estimates.
Example:
docinfo = inline
