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DELETE requires a shared table lock; Triggers fire; DELETE can be used in the case of: database link; DELETE returns the number of records deleted; Transaction log - DELETE needs to read records, check constraints, update block, update indexes, and generate redo / undo. All of this takes time, hence it takes time much longer than with TRUNCATE
Source: [1] A trigger cannot be attached to more than one operation (INSERT, DELETE, UPDATE), so a trigger must be created for each operation. The old and new values are exposed as fields of a record data structures. The names of these records can be defined, in this example they are named as O for old values and N for new values.
[6] Before trigger is for checking data and deciding if operation should be permitted. If exception is thrown from before trigger then operation is aborted and no data are changed. In DB2 before triggers are read only — you can't modify data in before triggers. After triggers are designed for post processing after requested change was performed.
All of the speedy deletion templates are named as Db-X with Db standing for 'delete because'. A list of the Db-X templates can be found at Wikipedia:Criteria for speedy deletion/Deletion templates. If a page falls under more than one of the criteria, instead of adding multiple tags it is possible to add a single {{Db-multiple}} tag to cover ...
Salesforce, Inc. is an American cloud-based software company headquartered in San Francisco, California.It provides applications focused on sales, customer service, marketing automation, e-commerce, analytics, artificial intelligence, and application development.
A data clarification form (DCF) [1] or data query form is a questionnaire specifically used in clinical research. The DCF is the primary data clarification tool from the trial sponsor or contract research organization (CRO) towards the investigator to clarify discrepancies and ask the investigator for clarification. The DCF is part of the data ...
The law of holes, or the first law of holes, is an adage which states: "If you find yourself in a hole, stop digging." It is used as a metaphor, warning that when in an untenable position, it is best to stop making the situation worse. [1] [2] The second law of holes is commonly known as: "When you stop digging, you are still in a hole." [3]
Digging is actually the combination of two processes, the first being the breaking or cutting of the surface, and the second being the removal and relocation of the material found there. [1] In a simple digging situation, this may be accomplished in a single motion, with the digging implement being used to break the surface and immediately ...