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Hello!
We are using ADO to work with SQLServer.
Our database is about 5Gb and some tables have about 600,000 records.
ADO provider opens such table for 3-5 minutes - the application is
"freezed".
Does anybody know how to avoid such big pause? Is it possible open table using ADO faster (I think ADO recordset retrives all records to navigate later inside it)? Some triks or tips? HELP!!!
This way we open the table:
m_pRecordset->Open((LPCSTR)"table_name", _variant_t((IDispatch*)mpdb, TRUE), adOpenKeyset, adLockOptimistic, adCmdTable);
Thank you!
Kind regards... Tau.
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Have you tried using stored procedures rather than directly opening the table?
Michael
Programming is great. First they pay you to introduce bugs into software. Then they pay you to remove them again.
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Can be an idea, but we would like to have more or less universal method for different servers also (Oracle, DB2, ...)
Kind regards... Tau.
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BTW, how can I use deferred columns in ADO?
(For a deferred column, the provider is not required to retrieve data from the data store until IRowset::GetData is called for that column)
Kind regards... Tau.
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Have you tried using adOpenForwardOnly instead of adOpenKeyset?
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I`ve tried that - the same...
Kind regards... Tau.
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adOpenForwardOnly, adLockReadOnly AND make sure connection and recordset have CursorLocation set to adUseServer (adUseClient will always be slower since it ignores the adOpenForwardOnly), adLockReadOnly minimizes the cursor overhead and produces a "firehose" cursor with SQL. Records will not actually be fetched until you position to them with movenext, and you can't move backwards...but should be **MUCH** faster.
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A couple things I can tell you about this.
1) If your table does not have a primary key in SQL Server, opening the table can take some time.
2) If the table has a primary key but it is not a clustered key you should try using a where clause such as "SELECT * FROM table_name WHERE PK_FIELD > 0". This forces SQL server to use an index even if you are getting everything this will often produce better results.
3) Try using a SELECT TOP XXX instead of select all.
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I'm not sure of the extent of the application you are working on, however if you are trying to return an entire table into a recordset (i.e. - especially if it contains 600,000 records) you may want to consider other ways of displaying your data. Look at it this way. Your user can't see all 600,000 records at once.
Nick Parker
The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown
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hello taualex
have you create the index for your table?
if you have not,then you must create it,
when you create it,you can shrink the time to about 1/5
open you sqlserver,right click to show manager index,
add the index on the fields which you search for it
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Use index in your database and try to use ADO.NET for
data communication. Bear in mind that don't use DataSet if you wanna use ADO.NET.
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I believe the only way to fix this is to use an ODBC driver, which, the last time I used one (several years ago), you had direct control over how many records you wanted to retrieve at a time. In other words, you could send the query and the retrieve records at your own consumption rate.
Marc
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I am Vietnamese. I am using Unicode and Database to design my Website. But I have problem. I use Unicode for Vietnamese , when I input into Form and Submit , but my data saved in MS Access 2000 not correct that I input into Form. Why ? How do I can correct this mistake.
Example :
I am input : Phương Thanh
Database Access 2000 saved : Phỳòng Thanh
Thank you.
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I can try list:
1:
if you have use the :enctype="multipart/form-data"
if you have,delete it
2:
you can
use asp:
<%response.write request("yourelement")%>
to test if the request("yourelement") is not correct
try it,and ask me your result,friends!;P
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I started using ADO.NET to access data from SQL database in my ASP.NET applications, however, those commands I used so far is to talk to an existed database. If I want to create a new database, is there any easy way to do it in ADO or sth. else? Thanks a lot!
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Assuming you are connected to the server as a user that has the rights to create a database (and next some tables)
CREATE DATABASE <database name>; look up in Books Online the syntax for CREATE DATABASE to see all the different settings you can specify. While you're looking that up, look up CREATE TABLE too, because you'll need some tables added in order to do much with that database
James
Sig code stolen from David Wulff
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This is a sql command, and I normally use ADO's object SQLcommand and its method "command.ExecuteNonQuery()" to execute the required sql command in my C# program or ASP.NET c# server code. However, that SQLcommand object requires connection first, which needs to have a existed DB available. So in this case, sqlcommand may not be a good choice to run that creation command. Any ideas any other object I can use in my C# program? Thanks a lot!
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You can connect to SQL server without using a specific database.
If you specify CATALOG in your connection string, remove it; and you should be ok. The account you use to connect to SQL Server (either Windows authentication or username/password authentication) needs to have permissions to create databases.
James
Sig code stolen from David Wulff
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I am using ADO and have the following queries in my database
Query: GetPW
SELECT [PW].[Number], [PW].[Status] FROM PW
WHERE [PW].[id]=CCID;
Query: GetPR
SELECT [PR].[Number], [PR].[Status] FROM PR
WHERE [PR].[id]=CCID;
Query: GetPWPR
PARAMETERS CCID Long;
SELECT *
FROM GetPW LEFT JOIN GetPR ON [GetPW].[Number]=[GetPR].[Number] ORDER BY [GetPW].[Number];
When I execute query "GetPWPR" from within access, It works fine. (ie Prompts for CCID input value and returns records from PR and PW as expected)
However when I execute using ADO::Execute command it fails with the error "IDispatch error #3127" (DB_E_NOTABLE)
Any clues ?
Thanks
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Does anyone know how to programmatically produce the OLEDB connection dialog box so that my application can ask for a database and then get its ConnectionString.
I'm using C#
Thanks,
Dave.
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You must use the Microsoft OLE DB Service Component 1.0 . It's a COM object.
Jason Gerard
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Cheers, I'll have a look.
Dave.
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I have a MS-SQL 2000 db with a timestamp field. What is the best type in c# to use to store the value of a timestamp?
The Doc's suggest that it is an 8 Byte number and that it should be stored in a DateTime. Is this correct?
Thanks
Stephen.
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This is the situation. We have an online SQL server powering a web site, and then another SQL server powering a back-office system. The web site SQL server is online all the time while the back-office SQL server only ever comes online when the users dial up.
When the users dial up we want to synch the two databases to contain identical data. Now while the back-office SQL server was offline the users could have entered in many records as well as many records being recorded on the web site SQL server. Obviously these records have unique IDs and primary keys associated with them, so we need to maintain relationships etc.
Neither is the "central" server so we cannot just replicate one to the other.
Does any body have any pointers as to what the most reliable method is of achieving this? Any links to tutorials, walk throughs, forums etc. on the subject would be much appreciated, ta.
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Maybe I'm not thinking about this correctly, but if you are using SQL Server 7+ can't you use Merge replication. With merge replication you don't need a "master" db. One DB has to be the publisher and others can be subscribers. With merge replication you can enter data in any of the DB's and have it replicated to the others.
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