apple banana Find rows that contain at least one of the two words.
+apple +juice Find rows that contain both words.
+apple macintosh Find rows that contain the word 'apple', but rank rows higher if they also contain 'macintosh'.
+apple -macintosh Find rows that contain the word 'apple' but not 'macintosh'.
+apple ~macintosh Find rows that contain the word 'apple', but if the row also contains the word 'macintosh', rate it lower than if row does not. This is "softer" than a search for '+apple -macintosh', for which the presence of 'macintosh' causes the row not to be returned at all.
+apple +(>turnover >strudel) Find rows that contain the words 'apple' and 'turnover', or 'apple' and 'strudel' (in any order), but rank 'apple turnover' higher than 'apple strudel'.
apple* Find rows that contain words such as 'apple', 'apples', 'applesauce', or 'applet'.
"some words" Find rows that contain the exact phrase 'some words' (for example, rows that contain 'some words of wisdom' but not "some noise words").
Foreground and Background Sector Switch (FSS vs BSS)
Last updated: 2018-12-04
What is the difference between a foreground (FSS) and a background sector switch (BSS)?
A sector switch is started as soon as a configured threshold is reached in the newer sector. In case the BSS threshold is exceeded, the FEE starts a sector switch in the background. This means the FEE copies the blocks as long as no user job will occur. If a user job occurs while a background sector switch is executed, the FEE aborts the sector switch in a non-destructive way and processes the user job. However, in some cases (e.g. the FEE has requested a Fls erase operation and waits for it to be finished) this may take some time. After the interrupting job is finished, the FEE restarts the sector switch from scratch. A BSS can either be triggered by a read or a write-like job.
Since a background sector switch might never finish if many user jobs shall be processed, the FEE can also process a sector switch in the foreground. In case the FSS threshold (higher than BSS threshold) is exceeded, the FEE defers the job and executes the sector switch itself before executing the job. A FSS can only be triggered by a write-like job.