This is more work, but most of the work is done in the buffer and minimal t-log is used. Are you changing a pretty significant portion of your table? If so, you might consider doing the merge in memory (SSIS data flow task or. Are you popping the log on tempdb or the user database? As long as the file is actually ordered by the key, you should be good. Outside of the temp table, everything looks ok here. You're loading to an empty B-Tree with no non-clustereds, using tf 610, the ordering key specified, in bulk-logged mode. ![]() It looks like you have the minimal logging rules covered pretty well. Splitting them into individual procedures makes them more modular / unit testable. The bulk load and the merge are independent of each other. Bundling independent procedures together.Then you can size you're files accordingly and not worry about impacting tempdb. I'd recommend doing the bulk load on a real table in the destination database. Here are a few things that you're doing but I wouldn't recommend. For some bulk operations, the t-log is a non-value adding bottleneck. I prefer ETL when possible, as the transform is done in the buffer and, when done correctly, requires minimal t-log writes. This is because the transform is done on disk (typically an update or insert). While ELTs leverage set based relational advantages and can be very fast, they are sometimes very write intensive (hard on storage). My first comment is that you are doing an ELT (Extract, Load, Transform) rather than an ETL (Extract, Transform, Load). TargetTable.EndDate = SourceTable.EndDate TargetTable.StartDate = SourceTable.StartDate , TargetTable.DepartmentCode = SourceTable.DepartmentCode , TargetTable.SubStatus = SourceTable.SubStatus , TargetTable.StatusCode = SourceTable.StatusCode , ![]() TargetTable.CMSDeclarationID = SourceTable.CMSDeclarationID , SET TargetTable.ItemID = SourceTable.ItemID , ON ( TargetTable.ItemID = SourceTable.ItemID ) - Defining condition to decide which records are alredy present USING #DeclarationClearanceHistory AS SourceTable - Records from the temproary table (records from csv file). MERGE dbo.DeclarationClearanceHistory AS TargetTable - Inserting or Updating the table. By using MERGE statement, inserting the record if not present and updating if exist. WITH ( FIELDTERMINATOR = '''', ROWTERMINATOR =''\n'', FIRSTROW = 2, KEEPIDENTITY, CODEPAGE = ''ACP'', ORDER = ''ITEMID ASC'' ) ') Inserting all the from csv to temproary table using BULK INSERTĮXEC ('BULK INSERT #DeclarationClearanceHistory IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, Creating a Temproary Table for importing the data from csv file.ĬREATE TABLE #DeclarationClearanceHistory All other import get imported successfully.Īny input in solving this would be welcomed. Looking at the log_reuse_wait_desc I see the following: (for testing purposes I do a full backup before starting the import). To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases ![]() The transaction log for database is full. Msg 9002, Level 17, State 4, Procedure SP_Import_DeclarationClearanceHistory_FromCSV, Line 34 The database is in BulkLogged recovery mode to minimize the logging, when executing the stored procedure below on a file containing 600000 rows I get an error I followed the steps as advised in Data Loading Performance guide. TDS refers to a protocol for transfering data from applications to database servers.I'm currently working on a project which bulk import data from flat files (csv) about 18 different files each linking to a specific table through some stored procedure. The data is in a binary format (encoded)īut there a few methods you can use to troubleshoot data load failures that utilise the INSERT BULK construct.ġ) Use the Profiler trace events Error:Exception and Error:UserMessage or Extended Events These events can give you some error details when process fails.Ģ) Utilise the Ring Buffer events which can report error messages on Tabular Data Stream (TDS) transfers. The values are transfered in a series of TDS messages after the INSERT BULK statement incorporating metadata information and the actual data. The tricky bit from a troubleshooting per, spective is you cannot view the values in the INSERT BULK statement. The INSERT BULK statement specifies the target tables \ columns including other meta data information - NULL management, triggers etc The Profiler trace whill display the INSERT BULK statement but the FROM part, meaning you cannot view the values. Net SqlBulkCopy
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