Your schema has a major flaw that is addressed in SQLite documentation: Do not put any fields after blob fields, especially if the content is typically large. SQLite accesses fields in the order of defintion, so to access your ANH_PRC_id field, it has to retrieve the 1MB ANP_VALUE blob.
Putting small and frequently acessed fields at the beginning of the definition allows SQLite to retrieve these fields without expanding the whole row. -----Ursprüngliche Nachricht----- Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von Aydin Ozgur Yagmur Gesendet: Mittwoch, 06. Juni 2018 11:06 An: SQLite mailing list <sqlite-users@mailinglists.sqlite.org> Betreff: [EXTERNAL] Re: [sqlite] Sqlite delete slow in 4GB Thank you very quick response. We have already planned to change file system. But this problem seem not related with the file size, because we did not hit the limit and when i try to delete same data in ,for example, 2 GB-sized db, i encounter with the same problem. This is my table and index definitions. Thanks for your help. CREATE TABLE "ANHXT" ( "id" integer primary key autoincrement, "ANH_AD" text, "ANH_DBGMHWID" text, "ANH_TYPE" integer, "ANH_INDEXNO" int64_t) CREATE TABLE "PRCXT" ( "id" integer primary key autoincrement, "ANP_SEGMENTNO" integer not null, "ANP_VALUE" blob, ==> "ANH_PRC_id" bigint, constraint "fk_ANHPRC_ANH_PRC" foreign key ("ANH_PRC_id") references "ANHXT" ("id") on update cascade on delete cascade deferrable initially deferred) CREATE UNIQUE INDEX UQC_ANH_TYPE on ANHXT( ANH_TYPE)CREATE UNIQUE INDEX UQC_ANP_SEGMENTNO_ANAHTARID on PRCXT( ANP_SEGMENTNO,ANH_PRC_id)CREATE INDEX findex on PRCXT( ANH_PRC_id) On Wed, Jun 6, 2018 at 11:42 AM, Karl Billeter <kbille...@gmail.com> wrote: > On Wed, Jun 06, 2018 at 09:27:57AM +0300, Aydin Ozgur Yagmur wrote: > > > I have been using fat32 file system. I have a database which has 4 > > GB > size. > > Er... I'm surprised there aren't more problems due to 4GB being the > max file size supported by fat32. Any chance to change it to exFAT? > > > K > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users ___________________________________________ Gunter Hick | Software Engineer | Scientific Games International GmbH | Klitschgasse 2-4, A-1130 Vienna | FN 157284 a, HG Wien, DVR: 0430013 | (O) +43 1 80100 - 0 May be privileged. May be confidential. Please delete if not the addressee. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
