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authorHeikki Linnakangas <heikki.linnakangas@iki.fi>2010-11-16 11:02:11 +0200
committerHeikki Linnakangas <heikki.linnakangas@iki.fi>2010-11-16 11:32:21 +0200
commit2edc5cd493ce3d7834026970e9d3cd00e203f51a (patch)
treeb688d8be9ade0364f35a4a5ebdb76406b528bcbd /doc/src
parentadd0ea88e7722b48d1f3a7c38e3cfd7f1e854674 (diff)
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The GiST scan algorithm uses LSNs to detect concurrent pages splits, but
temporary indexes are not WAL-logged. We used a constant LSN for temporary indexes, on the assumption that we don't need to worry about concurrent page splits in temporary indexes because they're only visible to the current session. But that assumption is wrong, it's possible to insert rows and split pages in the same session, while a scan is in progress. For example, by opening a cursor and fetching some rows, and INSERTing new rows before fetching some more. Fix by generating fake increasing LSNs, used in place of real LSNs in temporary GiST indexes.
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