Is there some way to overwrite MS Access database old data. like I wanna set a limit for a database, when the record meet the limit, new data overwrite old data.
And there is not so much record in my access database, but database file size go to 2G.
Related
I have an Access Database which I populate using a pass through query.
I get specific data from an SQL database and dumps it on Access.
This Access DB is updated weekly but I cannot simply append new data from the previous week because all other past weeks also updates.
What I did is truncate the Access DB and then load everything again.
When I do that, I need to Compact and Repair the DB so that the size doesn't bloat.
My question is, is it ok to do that? Currently I am using the logic posted in this answer.
I have not encountered any problems yet but I just want to make sure and get our access guru's thought about it. Also I'm planning on doing a scheduled run on our server to do the task.
Just need to make sure that it will not get corrupted easily (what is the chance of corrupting the file in the first place?).
If you'll ask, why do I need to do this? Users of data have no access on SQL server.So I have to pull data for them so they can just connect to Access DB instead.
Just in case you need the code:
Dim sqlDelete As String
Dim sqlAppend As String
sqlDelete = "DELETE * FROM dbo_Table;"
sqlAppend = "INSERT INTO dbo_Table (Col1,Col2) SELECT Col1,Col2 FROM passThrough;"
With DoCmd
.SetWarnings False
.RunSQL sqlDelete
.RunSQL sqlAppend
.SetWarnings True
End With
Application.SetOption "Auto Compact", True
If you need to truncate the data and load again I would recommend to move all tables, which should be truncated and all temporary tables to separate database.
After separating it will be possible to replace this database with unnecessary data by empty database file when the application starts. Just save a copy of empty database and copy this file over existing database with old data. This should be done before opening any form/recordset based on tables from temp database. It will work faster than C&R each time and more reliable, because sometimes C&R may damage the file.
Template database file also can be stored in main database in Memo field
I will refer this forum post: http://www.utteraccess.com/forum/index.php?showtopic=1561733
I am attempting to "sync" data from a read-only ODBC MySQL server to Access 2016. I need to move the data into Access so that I can more easily manipulate and create better customized reports.
I have linked the data tables between Access and MySQL, however I cannot get the data in these tables to automatically refresh. I must go into Access and hit "Refresh All".
What I'm looking to do is update all of my open tables in Access once nightly so that each morning the data used to build these reports is new. Currently if I leave these tables all evening, when I get in the next morning I must hit "Refresh-All" for Access to go retrieve the most recent data.
Any ideas?
The data in linked tables is automatically refreshed by access when you attempt to read them. You can do that by displaying a datasheet view of the database, or by a form where the linked table is the data source. Beware, we have had problems which tables with lots of records being the source for drop down lists, having the database locked.
Access only does this properly (and at speed) if either the underlying table has a unique clustered index, or after having linked the tables you create an index in access.
If you want to create a copy that you can manipulate (such as write to) and the underlying tables are read only, then you will have to create matching unlinked tables and execute some form of copy sql and appropriate points in your application.
I have this project that would require users to check in/out through a finger print reader ZK SF200.
The system that I am building needs to fetch new data that is added into this machine's database which unfortunately is a MS Access mdb file.
In my limited experience in MS Access databases, I managed to link this file to my MySql database table which allows me to manually do the insert from MS Access.
All I want to do now is to create some form of trigger that would add data to my MySql database when new rows are inserted into the MS Access table.
This problem would have been solved if the file type was .accdb because we can use After Insert events however it is an mbd type so those are not supported.
Any idea on how I can solve this matter ?
As a final note: I am willing to change DBMS in case MySql is the obstacle here. Would creating a linked server or doing sql server replication through mssql 2008 r2 work ?
EDIT: I need to insert data to MySql table because I have a trigger implemented there which does its side of logical manipulation of the data (ex: Increment the number of visits for the customer, check if customer subscription has expired or not and update the customer status accordingly)
Thank you.
Linking a table in MS-Access to the ODBC source is probably an answer for you. The table in MS-Access will be more like a view on the source table. Any DML operation (INSERT, UPDATE, DELETE) will be synced immediately with the source database. You will not need any trigger, which is not available in MS-Access (unless some VBA expert knows a solution).
The Linked table technology is default available for SQL-server, but since it uses ODBC I quess you can use it with MySQL too.
I have a database and its new version with changed reports, changed forms but with absolutly the same tables structure. The problem is that proper tables entries is stored in the old database.
How can I replace tables entries in new database with tables entries in old database?
Are you using a split database? You should be, so it would not matter that the back-end data was stored in an MDB and the front-end in an ACCDB.
I have a mySQL database that tracks our projects and drives our website's display of their info. For ease of updating the database I have set up an access database that used an ODBC connection (MySQL ODBC 5.1) to edit the data. It has been working just fine for the past few months with no hiccups.
However, last night users(2 of 3) experienced Write Conflict errors. The users could only Copy the changes to the Clipboard or Drop the changes. So thinking there is something wrong with the Access database I created a new access database, linked the tables through the ODBC connection, and still the issue occurred. I also deleted and recreated the ODBC connection, to no effect.
So where do I go from here? What could have caused this issue to crop up now, not when I was setting this up months ago?
There have been no changes to the database server, database or access database in the last week (+5 days).
We have made sure that only one instance of Access is attempting to effect the database.
All tables have a PK and a timestamp column.
We are not using any forms, just using the Table interface.
The server has not been updated, nor has the ODBC connection.
We are using Access 2007
Nothing is showing up in the server's error log when we try and update rows.
In general, all ODBC databases used from Access need to have PKs in all tables and timestamp fields in them that are updated each time the record is changed. Access uses this in bound forms for handling refreshes of the bound data and Jet uses them in in choosing how to tell the ODBC database what do update.
You may be able to get things to work with some tables without PK and timestamp, but I've found that it's best just to make sure that all your tables have them so you don't run into the problem (I never have any tables with no PK, of course).y
Make sure BIT columns have default values that are not NULL. Any records which have a BIT column set to NULL could get the Write Conflict error.