I have a huge table 170 Gb of size. On that table we have 10 indexes
of around 12 GB in size.
The application is designed such that it bulk inserts the file in to
sql server. But , often we are getting time outs and some latching
isssues ( as can be seen in activity monitor).
So, will this be a good idea of dropping those indexes and then
recreating them again for better performance.
Any help would be appreciated.I am running a script that does the following in succession.1-Drop existing database and create new database2-Defines tables, stored procedures and functions in the database3-Imports data using bulk insert4-Analyzes data using stored proceduresI would like to improve the performance of the analysis in step 4 bycreating indexes in step 2.Question 1-Are indexes updated when data is bulk inserted? I know they arewhen using normal insert, update, or delete T-SQL but I am not sure aboutbulk insert of data.Question 2-Do I need to update the index statistics in any way or would theybe ready to use in step 4.Thanks,CJ
I've been doing some experiments with speeding up copying tables ofapproximately 1 million rows between databases using BCP and BULK INSERT.I noticed that the total time for removing the indexes (non-clustered) andthen recreating them after the BULK INSERT was significantly less than justdoing the BULK INSERT with the indexes left there, even though I specifiedTABLOCK.I would have expected SQL Server not to update the index until the insertcompleted (given the table lock) and so removing the indexes would have noeffect. Can anyone explain why removing the indexes should speed it up?This is on SQL Server 7.CheersDave
I have a database that is giving me a bad Index error. When I go to drop the necessary Index it is telling me that it either does not exist or cannot be dropped. However when I try to build that index, it tells me one already exists.
Is there any way to drop all of the indexes or at the very least see what the indexes are? This particular database is using 2005 Express.
SQL 7 created by default a clustered index on my primary key field. I would like to drop this index and recreate it on another field, but it is not allowing me. Error message states: "An explicit DROP INDEX is not allowed... It is being used for PRIMARY KEY CONSTRAINT enforcement." Can anybody advise how I can solve this? TIA
Hi Has anyone heard of MS SQL Server 7 dropping indexes? I had created an index on a table. The next day the index had disappeared. Has anyone expirienced such a problem?
I would like to know if there is a way to drop/ disenable all the indexes in a maintenance plan? Or is it better to write scripts for dropping indexes and recreatig the same?
Purpose: Need to drop indexes(not the Primary key) before loading data and recreate the same after loading
I need to add syntax to a stored procedure to check for the existence of a specific indexes on a table before dropping it. If they do not exist I need it to NOT through an error message. Performing this on a table is relatively simple: if exists (select * from sysobjects where id = object_id(N'[dbo].[TABLENAME]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[TABLENAME]
Since indexes are not represented in sysobjects how can I do this?
Dear All, i'm planning to drop all the non clustered indexes (as they are not congigured well) on production database, and run the latest script to create fresh non clustered indexes on specific columns.
now my doubts are 1)will the replication affect with dropping and recreating of indexes? 2)query to drop all the non clustered indexes on that database.... can i use the query delete from sysindexes where indid>1 will the query works for me to drop all the non clustered indexes? 3)is it necessary to generate a snapshot again after creating the new indexes? or can i drop and run at subscriber also?
please guide me in this regard
Arnav Even you learn 1%, Learn it with 100% confidence.
This is for SQL 2005 and I know how to right click an index and do a "script index as create to new query window"
Basically, the one of the Microsoft scripts or views will tell us that we have 100+ indexes that exist for a database but that they are not being used by SQL server.
I will probably take them "offline" for a while and then drop them later on.
Before dropping them, I would like to be able to recreate them within minutes if system performance is degraded after this happens.
I was working on a script to pull this info out of the sys. tables like below but was wondering if anyone already has a script or an easier way to do this. (...and I don't want to right click 100 indexes within 137 tables and script to a new window and then compile a big script)
I'm just learning SSIS and I've hit my first bump. I am doing a bulk import from a tab delimited text file to an empty sql table that has a Idendity column defined. How do I tell the bulk insert task to skip that column when inserting from the text file. If I remove the identity column it imports the data fine, but I want to create the indentity column in the table too.
I have to update a field within a table of 60 records or so. Each record has a different field value. it's type varchar. i was given an excel file with the field values and was thinking of a bulk update like bulk insert, but i don't recall that it's possible that way.
Is the only way to create a table, bulk insert, then merge the two tables together with UPDATE?
Just wanted to see if there was an easier way to do it, otherwise i'll take the latter route. Thanks!
I have a table containing 8 million records. I need to replace 2 million of these records with a scaled down query that goes something like: SELECT 1, ShareholderID, Assets1 FROM MyTable (Yields appx. 200,000 recods) SELECT 2, ShareholderID, Assets2 FROM MyTable (Yields appx. 200,000 recods) . . . SELECT 10, ShareholderID, Assets1 + Assest2 + Assets3 + ... + Assets9 FROM MyTable (Yields appx. 200,000 recods)
Updates and cursors just seem to be too slow.
So far I have done the following, but was wondering if anyone could think of a better way. SELECT 6 million records that don't need to be deleted into a #TempTable Use statements above to select into same #TempTable DROP and recreate Original Table SELECT 6 + 2 million records INTO original table.
This seems rather convoluted. Is there a better approach? Would it be worth while to dump data to a file and use bcp / Bulk Insert
I receive the following error message when I try to use the Bulk Insert Task to load BCP data into a table:
Error: 0xC002F304 at Bulk Insert Task, Bulk Insert Task: An error occurred with the following error message: "Cannot fetch a row from OLE DB provider "BULK" for linked server "(null)".The OLE DB provider "BULK" for linked server "(null)" reported an error. The provider did not give any information about the error.The bulk load failed. The column is too long in the data file for row 1, column 4. Verify that the field terminator and row terminator are specified correctly.Bulk load data conversion error (overflow) for row 1, column 1 (rowno).".
Task failed: Bulk Insert Task
In SSMS I am able to issue the following command and the data loads into a TableName table with no error messages: BULK INSERT TableName FROM 'C:DataDbTableName.bcp' WITH (DATAFILETYPE='widenative');
What configuration is required for the Bulk Insert Task in SSIS to make the data load? BTW - the TableName.bcp file is bulk copy file as bcp widenative data type. The properties of the Bulk Insert Task are the following: DataFileType: DTSBulkInsert_DataFileType_WideNative RowTerminator: {CR}{LF}
Any help getting the bcp file to load would be appreciated. Let me know if you require any other information, thanks for all your help. Paul
I'm trying to use Bulk insert for the first time and getting the following error. I think it might have something to do with my Format File and from the error msg there's a conversion error for the first column. In my database the Field is nvarchar(6) so my best guess is to use SQLNChar for the first column. I've checked the end of each line is CR LF therefore the is correct for line 7 right?
Msg 4863, Level 16, State 1, Line 1 Bulk load data conversion error (truncation) for row 1, column 1 (ASXCode). Msg 7399, Level 16, State 1, Line 1 The OLE DB provider "BULK" for linked server "(null)" reported an error. The provider did not give any information about the error. Msg 7330, Level 16, State 2, Line 1 Cannot fetch a row from OLE DB provider "BULK" for linked server "(null)".
BULK INSERTtbl_ASX_Data_temp FROM 'M:DataASXImportTest.txt' WITH (FORMATFILE='M:DataASXSQLFormatImport.Fmt')
I am finding it difficult to find an example that allows for insertion of additional rows into a table, without dropping the table I'm inserting into. Or inserting specific values. Like this example..
[URL] ....
I have 6 table I am formatting the data to conform to the final table as I'm inserting it into, but none of these examples gives me the example needed. I am using SQL 2012.
<code> SELECT CONVERT(VARCHAR(50),[FName]) + ' ' + CONVERT(VARCHAR(50),[LName]) AS [CustName] ,CAST('ALARMCOM' as nvarchar(8)) as VendorName ,CONVERT(VARCHAR(25),[CUSTOMER_CS_ACCOUNT_NUMBER]) AS [Cust_ID] ,CONVERT(VARCHAR(40),[Charge_Description])as [ChargeType] ,CASE
My requirement is to sling a rowset from one place in SQL server into a table in another place in the most performant way. I want this to be parameterizable - I want to provide just a connection string and some SQL for the source and a connection string and a table name for the destination. The package should do the rest.Â
The solution I chose was an 2014 SSIS package with source and destination as ADO.NET connections configured from project variables. The package has a script task to bulk copy the data. For performance I disable the non-clustered indexes first.Â
But this performance precaution causes the bulk copy to timeout after delivering the correct rowcount to the destination table. What I can do to avoid this error?
Here's my script code:
//get hold of the source and a data reader from it SqlConnection sqlconnSource = new SqlConnection(); sqlconnSource = (SqlConnection)(Dts.Connections["source"].AcquireConnection(Dts.Transaction) as SqlConnection); SqlCommand sourcesqlCommand = new SqlCommand(SourceSQL, sqlconnSource); sourcesqlCommand.CommandTimeout = 1500;
[Code] ....
This takes 128 seconds to put 13 million thin rows into my empty destination table and then throws an exception with this message:
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Before implementing memory based bulk copy insert with IRowsetFastLoad interface of SQL Server 2005 OLE DB provider, I want to know some considerations.
- performance : compared with T-SQL's "BULK INSERT ..." and bcp utility
- SQL Server's resource usage : when running memory based bulk copy, server resource's influence
- server side action(behavior) : when server is busy, delayed-update means IRowsetFastLoad::Commit(true) method can insert right after?
- row-count : The rowcount limitation can be inserted by IRowsetFastLoad::InsertRow() method before IRowsetFastLoad::Commit
I have a web form with a text field that needs to take in as much as the user decides to type and insert it into an nvarchar(max) field in the database behind. I've tried using the new .write() method in my update statement, but it cuts off the text after a while. Is there a way to insert/update in SQL 2005 this without resorting to Bulk Insert? It bloats the transaction log and turning the logging off requires a call to sp_dboptions (or a straight-up ALTER DATABASE), which I'd like to avoid if I can.
Hello, I am wondering is the Transaction Log logged differently between BULK INSERT vs INSERT? Performance speaking, which operations is generally faster given the same amout of data inserted.
Hi~, I have 3 questions about memory based bulk copy.
1. What is the limitation count of IRowsetFastLoad::InsertRow() method before IRowsetFastLoad::Commit(true)? For example, how much insert row at below sample?(the max value of nCount) for(i=0 ; i<nCount ; i++) { pIFastLoad->InsertRow(hAccessor, (void*)(&BulkData)); }
2. In above code sample, isn't there method of inserting prepared array at once directly(BulkData array, not for loop)
3. In OLE DB memory based bulk copy, what is the equivalent of below's T-SQL bulk copy option ? BULK INSERT database_name.schema_name.table_name FROM 'data_file' WITH (ROWS_PER_BATCH = rows_per_batch, TABLOCK);
------------------------------------------------------- My solution is like this. Is it correct?
// CoCreateInstance(...); // Data source // Create session
I have two SSIS packages that import from the same flat file into the same SQL 2005 table. I have one flat file connection (to a comma delimited file) and one OLE DB connection (to a SQL 2005 Database). Both packages use these same two Connection Managers. The SQL table allows NULL values for all fields. The flat file has "empty values" (i.e., ,"", ) for certain columns.
The first package uses the Data Flow Task with the "Keep nulls" property of the OLE DB Destination Editor unchecked. The columns in the source and destination are identically named thus the mapping is automatically assigned and is mapped based on ordinal position (which is equivalent to the mapping using Bulk Insert). When this task is executed no null values are inserted into the SQL table for the "empty values" from the flat file. Empty string values are inserted instead of NULL.
The second package uses the Bulk Insert Task with the "KeepNulls" property for the task (shown in the Properties pane when the task in selected in the Control Flow window) set to "False". When the task is executed NULL values are inserted into the SQL table for the "empty values" from the flat file.
So using the Data Flow Task " " (i.e., blank) is inserted. Using the Bulk Insert Task NULL is inserted (i.e., nothing is inserted, the field is skipped, the value for the record is omitted).
I want to have the exact same behavior on my data in the Bulk Insert Task as I do with the Data Flow Task.
Using the Bulk Insert Task, what must I do to have the Empty String values inserted into the SQL table where there is an "empty value" in the flat file? Why & how does this occur automatically in the Data Flow Task?
From a SQL Profile Trace comparison of the two methods I do not see where the syntax of the insert command nor the statements for the preceeding captured steps has dictated this change in the behavior of the inserted "" value for the recordset. Please help me understand what is going on here and how to accomplish this using the Bulk Insert Task.
hi friends i am trying for bulk insert using SQL server 2000using this codebulk insert xyzfrom 'D:authors.txt'WITH (FIELDTERMINATOR = ',') but it gve me error saying thatCould not bulk insert because file 'D:authors.txt' could not be opened. Operating system error code 21(error not found). i check file securityit has given full control to the file can any one give me idea about Operating System error code 21(error not found) thanks
Hi,I've a SP that insert records in one table and then call another insert SP on a second table. The first table is like a master table and the second is like a child table. After inserting the right record in the master table, I've to insert some record in the child table. This records differ each other only by two of about ten field, so what I'd want is not to call the second SP X times, but only one time.. Is it possible??ExampleTable1: Id (identity), Desc;Table2: Id (identity), Id_table1, Id_TableX, Num, Field1, Field2, ... Field10.In Table2 only Id_TableX and Num change every time... the other are all the same (for one record in Table1). How can I do? Probably with a bulk insert and a bulk update?? But, can I make a bulk xxx without a file??
hi friends i am using bulk insert cmd using my table name but i am facing error.....SO IS IT POSSIBLE TO USE BULK INSERT WITH TEMPRARY TABLE VARIABLE PLZ HELP ME
I want to move data from a text file to a SQL table. After DTS creates the table, does it use Bulk Insert to copy the data from the file to the table, or BCP?
I am trying to do a bulk insert from a data file into a linked access database. When I run the query I get the error message: 'Server: Msg 4801, Level 16, State 81, Line 1 Bulk_main: The opentable system function on BULK INSERT table failed. Not sure what the problem is because BOL just says to check Microsoft.com for updated error message information. However, when I went to the site there was no updated information. Has anyone else seen this error? If so, have you figured out the problem? Any help would be greatly appreciated. Thanks.
