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Sat, Jul 7 2007 11:22 AM | Permanent Link |
Dave Harrison | I'm using Sysutil v4.25 and I'm trying to delete a few million rows
using something like: delete from table1 where col1 like '%.x' or col1 like '%.y'; This will execute for 15 minutes or so and will get 50% to 75% complete then it will throw an error: "DBISAM Engine Error # 10258 Cannot lock record in the table 'table1'"; This is odd because there is nothing else running on the computer, only DbSys and of course nothing else is trying to access this table. I've run a Verify table and everything is ok. So why can't it get a lock on the table? I've tried it 3 times and it can never finish deleting the rows. TIA Dave |
Sat, Jul 7 2007 11:41 AM | Permanent Link |
Dave Harrison | I was able to "solve" the problem by executing it in 2 Delete statements
as in: delete from table1 where col1 like '%.x'; delete from table1 where col1 like '%.y'; and they completed ok. The first statement deleted 1.9 million rows and the second statement deleted approx 400k rows. Dave |
Mon, Jul 9 2007 5:06 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. ![]() | Dave,
<< This will execute for 15 minutes or so and will get 50% to 75% complete then it will throw an error: "DBISAM Engine Error # 10258 Cannot lock record in the table 'table1'"; This is odd because there is nothing else running on the computer, only DbSys and of course nothing else is trying to access this table. I've run a Verify table and everything is ok. So why can't it get a lock on the table? I've tried it 3 times and it can never finish deleting the rows. TIA >> It's a record lock that it is having trouble with. However, I don't know why since DBISAM uses a bitmap for the record locks, and it should be able to handle that many record deletions in one transaction. My guess is that DBISAM is hitting a memory limit somewhere and that is causing the issue. Is there any chance I can get a download or FTP link for the table in question ? -- Tim Young Elevate Software www.elevatesoft.com |
Mon, Jul 9 2007 9:45 PM | Permanent Link |
Dave Harrison | Tim Young [Elevate Software] wrote:
> Dave, > > << This will execute for 15 minutes or so and will get 50% to 75% complete > then it will throw an error: > > "DBISAM Engine Error # 10258 Cannot lock record in the table 'table1'"; > > This is odd because there is nothing else running on the computer, only > DbSys and of course nothing else is trying to access this table. > > I've run a Verify table and everything is ok. > > So why can't it get a lock on the table? I've tried it 3 times and it can > never finish deleting the rows. TIA >> > > It's a record lock that it is having trouble with. However, I don't know > why since DBISAM uses a bitmap for the record locks, and it should be able > to handle that many record deletions in one transaction. My guess is that > DBISAM is hitting a memory limit somewhere and that is causing the issue. > Is there any chance I can get a download or FTP link for the table in > question ? > Tim, I'm afraid I can't release the data. But I can try and generate random data with a similar schema and see if that fails. I'll get back to you on this. Dave |
Tue, Jul 10 2007 11:52 AM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. ![]() | Dave,
<< I'm afraid I can't release the data. But I can try and generate random data with a similar schema and see if that fails. I'll get back to you on this. >> Thanks. I would try to use a similar table here, but a lot depends upon factors such as the row size, etc. when it comes to memory/capacity issues. -- Tim Young Elevate Software www.elevatesoft.com |
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