truncate statement in sql

right! Removed very violently, as the eldest was well deserved Dick-----truncate. Infested occasions: TRUNCATE TABLE TB Trick: delete content, free space without deleting the definition. Unlike the drop, he just clears the table data, and he's more gentle. It is also a class, he only removes all the students. The class is still in, the job is still in, if the new student can enter, also can

Today, when cleaning up business-Library data, developers say they can use TRUNCATE table to clean up all data from two tables Both tables have their own ID, all made table partitions, single table 200GB, two tables using SELECT ident_current (') The current self appreciation is 3000012, the two tables are almost identical, except for one or two fields. I executed two SQL statements,

recovery log sequence numbers (MinLSN). MinLSN is the minimum logging required to achieve a successful database-wide rollback.The structure of the transaction log is as follows:Each virtual log consists of multiple records, each with an LSN (an SQL atomic statement). Analyzing the above figure we can see that the virtual Logs 1 and 2 are intercepted, which indicates that the transactions in virtual Logs 1

TRUNCATE table is functionally the same as a DELETE statement without a WHERE clause: Both delete all rows in the table. However, TRUNCATE TABLE is faster than DELETE and uses less system and transaction log resources. The DELETE statement deletes one row at a time and records an entry in the transaction log for each r

TRUNCATE statement defaults to the space release to minextents extent unless using reuse storage;truncate resets the high watermark (back to the beginning). 4. Speed, in general: drop> truncate > Delete 5. Security: Use Drop and truncate carefully, especially when there is

Same point: Truncate and delete with no WHERE clause, and drop deletes data in the table Different points: 1. Truncate and delete Delete only the data do not delete the structure of the table (definition) The DROP statement deletes the table's structure-dependent constraints (constrain), triggers (trigger), indexes (index), and the stored procedures/functions

and saving the row's delete operation as a transaction record in the logFor a rollback operation.Truncate and delete without where: delete data only, without deleting the structure of the table (definition)4. truncate TABLE deletes all rows in the table, but the table structure and its columns, constraints, indexes, and so on, remain unchanged. The count value used for the new row identity is reset to the seed of the column. If you want to preserve t

In this paper, we introduce the difference between truncate and delete in SQL by a simple example, and help us understand the following details. ---Create a table Table1 IF object_id (' Table1 ', ' U ') is not a NULL DROP table Table1 go CREATE table Table1 (ID int NOT NULL, foid int ' not NULL ' go --Inserts test data insert INTO Table1 VALUES (1,101), (2,102), (3,103), ( 4,104) Go ---Create a

Tags: import use hang share picture DMI lag ref page ToolWhen TRUNCATE table occurs, how to recover, I believe most people will choose to restore the backup to TRUNCATE table before, and then re-import the data into the formal table.So in SQL Server is not really only this method, of course, this is the content of this article will be introduced, the precondition

TRUNCATE TABLEDeletes all rows in the table without logging a single row delete operation.GrammarTRUNCATE TABLE NameParametersNameis the name of the table to truncate or the table whose entire row you want to delete.CommentsTRUNCATE TABLE WHERE DELETE TRUNCATE TABLE DELETE The DELETE statement deletes one row at a ti

Same point:1.truncate and delete without a WHERE clause, and drop deletes the data in the table.2.drop, truncate are DDL statements (data definition language) that are automatically committed after execution.Different points:1. Truncate and delete only delete data without deleting the structure of the table (definition)The drop

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