CODEWITHSUNDEEP
ms-accessms-access-2007
T-Rex
T-Rex

Reputation: 161

Access Table Corrupting database

I have a table, “tblData_Dir_Statistics_Detail” with 15 fields that is holding about 150,000 records. I can load the records into this table but, am having trouble updating other tables from this table (I want to use several different queries to update a couple different tables). There is only one index on the table and the only thing unusual about the table is there are 3 text fields that I run out to 255 characters because some of the paths\data are that long or even exceed 255. I have tried trim these to 150 characters but it has no impact on the correcting the problems that I am having using this table.
Additionally, I manually recreated the table because it acts like it is corrupted. Even this had no impact on the problems. The original problem that I was getting is that my code would stop with a “System resource exceeded.”. Here is the list of things I am experience and can’t seem to figure out why:

  1. When I use the table in an update query (using task manager) I always see my Physical Memory usage for Access jump from about 35,000 K to 85,000 K instantly when the code hits this query and then, within a second or two, I get the resources exceed error.
  2. Sometimes, but not all the time, when I compact and repair, tblData_Dir_Statistics_Detail is deleted by the process and is subsequently listed in MSysCompactError table as an error. The “ErrorCode” in the table is -1011 and the “ErrorDiscription” is “System resource exceeded.” enter image description here
  3. Sometimes, but not all the time, when I compact and repair, if I lose tblData_Dir_Statistics_Detail, I will lose the next one below it in the database window (shows also in the SYS table).
  4. Sometimes, but not all the time, when I compact and repair, if I lose tblData_Dir_Statistics_Detail, I will lose the next TWO positions below it in the database window (shows also in the SYS table).

I have used table structures like this with much larger tables without problems for years. Additionally, I have a parallel table “tblData_Dir_Statistics” which has virtually the same structure and holds the same data but at a summarized level, and have no trouble with that or any other table.

Summary: My suspicion is that there is some kind of character being imported into one of the fields that is corrupting this entire table.

  1. If this is true, how could I find the corruption?
  2. If it is not this, what else could it be?

Many Thanks!

Upvotes: 0

Views: 548

Answers (1)

Barranka
Barranka

Reputation: 21057

A few considerations:

  • Access files have a size-limit of 2 GB. If your file becomes at any time bigger than 2 GB (even by 1 byte) the whole file is corrupted
  • Access creates temporary objects when sorting data and/or executing queries (and those temporary objects are created and stored in the file). Depending on the complexity of your queries, those temporary objects might be pushing the file size up (see previous paragraph).
  • If you are using text fields with lengths bigger than 255 characters, consider using Memo fields (these fields cannot be indexed as far as I remember, so be careful when using them)
  • Consider adding more indexes to your tables to ease and speed up the queries.
  • Consider dividing the database: Put all the data in one (or more) file(s) and link the tables in it (them) to another Access file, and execute the queries in this last one.

Upvotes: 1

Related Questions