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| Status | Unavailable — filed 2026-10-15, not read. Looked for a lawful full text of the journal version (ACM TODS 28(4), 2003) on 2026-10-15 and found one that could not be fetched. The authors' own copy is listed at oak.cs.ucla.edu/~cho/papers/cho-tods03.pdf (a web search returns it with the title "Effective Page Refresh Policies For Web Crawlers"), but that server did not answer from this environment: nine requests over about seven minutes each returned 503 with an upstream connection timeout, and WebFetch got the same; the author's index page there, and the old Stanford address infolab.stanford.edu/~cho/ (which redirects to it), behaved the same, and web.cs.ucla.edu/~cho/papers/cho-tods03.pdf is 404. The ACM Digital Library returned 403. Unpaywall and Semantic Scholar report it closed; OpenAlex reports it closed and lists two CiteSeerX records (10.1.1.3.7723, 10.1.1.89.8050), which could not be reached (connection reset, then a redirect to the Internet Archive, which is unreachable from here). ResearchGate's page returned 403, and who uploaded its copy is unknown. Stanford's InfoLab technical-report server (ilpubs.stanford.edu:8090) timed out. The University of Crete course page holds slides about the paper, not the paper. What is lawfully available is the other version: the SIGMOD 2000 conference paper (LIT-1119, read), and the authors' October 1999 Stanford technical report of it on a KTH course page, which lacks what the journal adds (by its abstract and secondary accounts, among other things, refresh weighted by page importance). Found but could not be fetched. |
| Tags | databases, information-retrieval, operations-research |
Cho, J. and Garcia-Molina, H. (2003). Effective page refresh policies for Web crawlers. ACM Transactions on Database Systems 28(4), 390–426. DOI 10.1145/958942.958945
Unavailable (see the status note).
The journal treatment of the refresh problem of LIT-1119 (QUESTION-114). Unavailable: the author’s copy exists but could not be fetched.