Hi everyone, a little update. We have upgraded our system to 7.4.17. The problem of truncated files seems now better, but it is still present. We have not found a clearly understandable pattern on why this happens. Just to provide some further information: - we create a file and store on the DB; - we give the file to the user, and he can modify at its wish the file; - we store back the modified file on the DB; - the last two points can happen several times. Any hint? Best regards. Paolo Bizzarri Icube S.r.l. On 5/30/07, Purusothaman A <purusothaman.a@xxxxxxxxx> wrote:
Paolo Bizzarri, I am also using postgresql in my application and also facing file object corruption problem. I already discussed several times with Richard Huxton, and ended without any clue. Here I am briefing my problem, see if u find any clue about it. I am storing/retrieving my file in postgresql using lo_export() and lo_import() api. after few weeks (as application is being used - number of file objects in database also grows) my file object gets corrupted. And I have no clue about which causes this problem. I confirmed the file corruption by the following query, sfrs2=> select loid, pageno, length(data) from pg_largeobject where loid = 101177 and pageno = 630; loid | pageno | length --------+--------+-------- 101177 | 630 | 181 (1 row) But actually the result of the above query before corruption(ie, immediately after file object added to table) fasp_test=> select loid, pageno, length(data) from pg_largeobject where loid = 106310 and pageno = 630; loid | pageno | length --------+--------+-------- 106310 | 630 | 205 (1 row) I uploaded same file in both(sfrs2, fasp_test) databases. The first one result is after the corruption. and the later is before corruption. You also confirm you problem like this. And I strongly believe that, there is some bug in PostgreSQL. Kindly don't forget to alert me once u find solution/cause. Regards, Purusothaman A On 5/30/07, Paolo Bizzarri <pibizza@xxxxxxxxx> wrote: > > On 5/30/07, Richard Huxton <dev@xxxxxxxxxxxx> wrote: > > Paolo Bizzarri wrote: > > > We use postgres as a backend, and we are experimenting some corruption > > > problems on openoffice files. > > > > 1. How are you storing these files? > > Files are stored as large objects. They are written with an lo_write > and its contents is passed as a Binary object. > > > 2. What is the nature of the corruption? > > Apparently, files get truncated. > > > > As our application is rather complex (it includes Zope as an > > > application server, OpenOffice as a document server and as a client) > > > we need some info on how to check that we are interacting correctly > > > with Postgres. > > > > Shouldn't matter. > > I hope so... > > > > We are currently using: > > > > > > - PostgreSQL 7.4.8; > > > > Well, you need to upgrade this - version 7.4.17 is the latest in the 7.4 > > series. You are missing 9 separate batches of bug and security fixes. > > Ok. We will upgrade and see if this can help solve the problem. > > > > > > - pyscopg 1.1.11 ; > > > - Zope 2.7.x; > > > - Openoffice 2.2. > > > > None of this should matter really, unless there's some subtle bug in > > psycopg causing corruption of data in-transit. > > > > Let's get some details on the two questions above and see if there's a > > pattern to your problems. > > Ok. Thank you. > > Paolo Bizzarri > Icube S.r.l. > > ---------------------------(end of broadcast)--------------------------- > TIP 5: don't forget to increase your free space map settings > -- http://PurusothamanA.wordpress.com/
