In the database structured query language (SQL), the DELETE statement removes one or more records from a table.

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Delete rows while updating references

Suppose I have a person table with an id and some other columns. Other tables reference the person table using ON UPDATE CASCADE. for instance: CREATE TABLE person (id int PRIMARY KEY); CREATE TABLE ...
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42 views

Low batch Batchrequests/sec

I am running this query to do massive deletion in my database. I am looking at Batchrequests/sec and it is quite low (like 15% of what my server can handle) Is there any way to rewrite this query to ...
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80 views

Why is this query stuck if there are no waits?

I am working with a vendor's activity logging system. One of the tables has 70+ million records and is constantly increasing at several hundred records per minute. They have a utility to delete old ...
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2answers
169 views

How do automaticly delete rows from other tables

I have a MySql DB. I have a table - recipes. Also have 2 tables -ingredients and instructions. both have for each entry - a foreign key to the related recipe. I want that when I delete an entry from ...
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514 views

Optimization: Delete with Top and minimize the where clause date range

I have a delete statement that get run repetitive until all the data are removed. Delete TOP (1000) From Log Where CreationDate < '2011-Dec-31' AND pKey NOT IN (...) I am considering of ...
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37 views

Soft delete to improve performance: all wrong?

A few years back I read soft delete would improve performance of deletion, because instead of actually removing the item and impact the clustered (and all other) indices, it would just change a value. ...
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3k views

Delete rows in parent table based on criteria in child table - Oracle

I have a table B with a foreign key to table A. I want to DELETE some rows in table B, and I also want to DELETE their parent rows in table A. However, the delete criteria is based on table B. The ...
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3answers
616 views

MySQL Large DELETE with JOINs

I have a large table players with ~20MM rows which joins to a table stats with ~300MM rows, among others (photos, ...). I want to DELETE all records for players that were born_on before 1950. I ...
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162 views

Slow DELETE in MySQL with a subquery

I am running the following DELETE SQL on a MySQL database on a MyISAM/utf8 table. The SQL is called in a loop, once time per Users (in this case):- DELETE FROM regulatory WHERE documentid IN ( ...
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759 views

Delete Query takes a long time

I have a innodb table that counts circa 1 billion entries. I started a delete operation (with a small where condition on an indexed column) that should delete a lot entries, leaving circa 100 million. ...
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53 views

How many records should be deleted when batch delete is used?

I am going to migrate a large amount of data from one table to other table. The target data source table has foreign key constrains, so I am not able to use DELETE with OUTPUT clause, but need to have ...
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21 views

Run SQL requests generated by some script

I'm using this script to delete data from all the tables in my database. It generates DELETE statements in proper order, each request in one row : DECLARE @schema_name sysname; DECLARE @table_name ...
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487 views

Effective duplication of DELETE … LIMIT in Pg

I have an unusual problem: I need to delete a certain number records from a table, of a particular type; in certain non-compliant DBs it would be easy to accomplish this with DELETE FROM sometable ...
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136 views

Multiple source CASCADE DELETE behavior

I'm having trouble understanding Postgres's CASCADE DELETE behavior. If table_A REFERENCES table_B, and the column referenced could have multiple instances of the same value, will the table_A row be ...
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1answer
278 views

I have delete database from mysql but storage is not freed

I have deleted multiple databases (schema) from mysql on amazon RDS but the storage is not freed, is there anything else I should do to free up the storage? I have a mysql database that the total ...
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1answer
123 views

myISAM data loss at DELETE / INSERT

I have a linked table id_group | id_user. Every time I add a one or more users to a group I DELETE all the links and INSERT the users again including the new one(s). This is how the framework of the ...
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24 views

How to remove data from multiple tables with different foreign keys without using ON DELETE CASCADE?

I have the following SELECT statement: SELECT * FROM "Users" u INNER JOIN "Calendars" c ON (u."UserId" = c."UserId") INNER JOIN "Actions" a ON (c."CalendarId" = a."Calendar_CalendarId") WHERE ...
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60 views

decrement all columns entry when row is deleted

I have a column in a table containing the row_number, some kind of id number to identify the row. When I delete one row, I need the other rows to have their row_number decremented, to keep them ...
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72 views

DELETE from OPENQUERY alias not working

I'm trying to use the following code to execute a DELETE statement on a linked server. I'm trying to delete all records from the remote server where there is a match on a certain ID field in both the ...
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1answer
64 views

SELECT count vs DELETE JOIN. Why/how are they different?

Can someone explain in what way these queries could be different and the results are not the same? > begin; Query OK, 0 rows affected (0.01 sec) >select count(*) from tableA a JOIN tableB ...
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1answer
43 views

ON DELETE CASCADE pseudo delete

For data integrity ON DELETE CASCADE is necessary but it's really dangerous when a delete affects like a Chain Reaction! I know one way to prevent this is to make a pseudo delete by putting a ...
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1answer
35 views

Is it possible (or good practice) to register data upon Deletion of a record? What would be a better solution?

The problem is the following. A company has one or more representatives (a person who speaks on behalf of the company). When a representative is deleted, it's desired to keep it in an list called ...
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1k views

Massive MySQL delete from CSV file

To insert massive CSV file into MySQL, there is LOAD DATA INFILE, but is there any similar command to delete massive entries with keys stored in a massive CSV file? If not, what would you see as the ...
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886 views

Deleting Record from Linked Table Slow in MS Access

I have a Microsoft Access database that is linked to a SQL Server 2000 backend. It has one form with several subforms, all using information from linked tables. When I try to delete a record from one ...
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574 views

Trigger to delete inserted record if it doesn't exist in another table

I have a question. I have two tables: zip_code (zip_id, zip_code, state) - this is a static table that stores areas I service tech_zips (tz_id, tech_id, zip) - this is where I store what zip codes ...
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372 views

Mysql foreign key cascade delete

Does mysql have a way to delete all sub links if a row was deleted from a "parent" table? Example table setup is below, the issue I am trying to avoid is having to maintain a script that deletes the ...
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225 views

Need ideas about OPTIMIZE TABLE

Looking at a database with 10 tables and fairly active at by-the-hour changes. On the first of each month, I purge some rows from 3 tables to remove outdated material and keep the size down. All of ...
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8 views

How to subtract records from a table based on their existence in another

I have an Access 2010 table Assignment key Empl Number key Year Number key Week Number key Proj Number It assigns employees to zero or more projects for given work weeks, thus, all ...
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30 views

I have a table from which I can retrieve information but I cannot update or delete information

I can update and delete items via PhpMyAdmin. I changed the owner to mysql. My program is a clone of insert, update, and delete that is functioning for other tables within the database. I receive a ...
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57 views

SQL Server Deadlock on delete

I have a query like this: with xx as ( SELECT [FilePath], ROW_NUMBER() over (partition by [FilePath] order by [FilePath]) as RowNumber FROM [dbo].[foo] ...
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12 views

Releasing space after deleting datafiles

I'm deleting old backup tablespaces with option using contents and datafiles in TOAD. Datafiles were deleted, but no space was released: Filesystem GB blocks Free %Used Iused %Iused ...
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42 views

Access 2010 delete and append queries run partially then give “Read Only” error

I have a number of append and delete queries written in Access 2010 that link to and modify tables on our SharePoint 2010 site. These queries have run without problem for months, but suddenly they've ...
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46 views

Purging Data that has Foreign Keys

I have a transaction database that we recently went live with. The number of rows in the tables are starting to climb into the millions. So I am looking at how to purge the older data. I have written ...
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31 views

DELETE statement execution cancellation in SSMS

I ran a delete statement with wrong WHERE condition (which deletes all records from table instead of just 10 records) but during execution I found it and CANCELLED the execution in sql server ...
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26 views

How to find Deleted and Updated record tables in MYSQL database?

I have scenario like below. I need to find Deleted records and updated records effected tables in mysql. Ex: I update my Name or Email Id in UI that is effected in some tables either one table or ...
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86 views

delete millions of rows from multiple tables

Hi we have to delete between 40 and 55% of records from several tables that have between 40 million and 100 million rows. Is it better to copy the rows we want to keep to a new table, drop the source ...
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1answer
347 views

DELETE from Linked Server table using OPENQUERY and dynamic criteria

I'm attempting to run a DELETE statement from my local MSSQL Server to delete appropriate records from a table in my remote linked server using OPENQUERY(). I'm using the following code, but it seems ...
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38 views

Update on table deletes the record

I'm having a problem in my oracle database, I have a table PAYMENTS which has an ID (PK) and when I want to update a record: UPDATE PAYMENTS SET AMOUNT = 2000 WHERE ID = '1'; The record with ID = ...
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126 views

insert record to child table which doesn't map to parent table - possible?

Actually I've 2 relevant questions: insert record to child table which doesn't map to parent table - possible? ON DELETE NO ACTION - when a record in parent table is deleted, it should affect ...
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2answers
138 views

PostgreSQL : dependencies on a schema

I need to delete a schema in my PostgreSQL database. I would like to make sure that the schema is not used in another schema (for instance : this schema is used for a view in another one). Is there a ...
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14 views

Lower resolution of record on MySQL

The database I'm currently working on logs about 50 columns of data per second on our plant. The current high frequency logging is due to ongoing test. However, going long term, this would not be ...
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44 views

Update existing (old) rows vs delete and insert when needed

I'm building a database system that needs to store login tokens for a system that validates if a users login token is valid or outdated. The table is pretty simple UserID int Primary Key LoginToken ...
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1answer
36 views

Can having a LIMIT on DELETE degrade performance dramatically?

I have a database project in php and mysql. For, hopefully redundant, data security I added a LIMIT 1 to the delete($uniqueID) php function we use. Nobody cared because records really aren't ...
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1answer
367 views

Delete millions of rows, fast

I currently have a database with the following structure: id->varchar(9) time->datetime val01 - val20->int(11) val21 - val40->tinyint(1) id and time are the primary key. also I defined an index ...
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282 views

DELETE query against a linked server issues error

I have a query that is part of a bigger process, and runs against a linked server. The code is like this: DELETE FROM [LinkServerIP].[Database].[dbo].[TableName] WHERE NOT EXISTS ( SELECT * ...
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135 views

Importing large .sql file stops before even midway and starts deleting

Okay so i'm trying to import my minecraft servers .sql file into database and after first 1GB of importing data it stops without error and starts deleting what already has been imported any ideas? ...
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47 views

Delete the second record where a user has two records

I have a simple database scheme, which due to previously being badly set up has numerous duplicate records. record_table |--------------------------------------------------------| | id | subid | ...
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3answers
195 views

Delete all the data from all tables

I have a little problem. I have to delete all the data from our database. I don't want to drop tables, only delete the data sets. These are 47 tables in total. I tried the following: Delete ...
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Safely deleting a SQL Server log file (.LDF)

I can make sure my app is in a consistent state. I can rollback all the uncompleted transactions if any (just in case) it's ok I can DETACH the database What do I need the log file for after that? ...
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What will the sql statement “DELETE FROM sales” do?

DELETE FROM sales; And if there are no other uncommitted transactions on the sales table. Which statement is true about the DELETE statement? It removes all the rows in the table and deleted rows ...