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The INSERT command to add the new record to the Order table was processed within the transaction, but the UPDATE command to change the inventory total failed, as the user did not have permission to update the Product table When the COMMIT statement was processed to commit the transaction, it produced the ROLLBACK message, which indicates the transaction was rolled back and not processed Looking at the Order table, you can see that the record that was inserted during the transaction was removed (rolled back) from the table
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Besides the auto-rollback feature, PostgreSQL also allows you to perform a manual rollback at any point within the transaction using the ROLLBACK command:
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test=> begin; BEGIN test=> insert into store"Order" values ('BLU001', 'LAP001', 2, test(> '100000', 'ORD004'); INSERT 0 1 test=> select * from store"Order" where "OrderID" = 'ORD004'; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + BLU001 | LAP001 | 2 | $1,00000 | ORD004 (1 row) test=> rollback; ROLLBACK test=> select * from store"Order" where "OrderID" = 'ORD004'; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + (0 rows) test=> commit; WARNING: there is no transaction in progress COMMIT test=>
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When the INSERT command is processed, the record is added to the table, but only within the confines of the transaction PostgreSQL hides the changes from other users using the Multi-version Concurrency Control (MVCC) feature, discussed in 1 If another user should query the table at this point in time, the record would not be visible to them After inserting the new record, the ROLLBACK command is executed This removes any previously executed commands since the start of the transaction The newly added record is removed from the table, and the transaction is aborted In this example, once the ROLLBACK command is executed, the entire transaction is aborted Sometimes in extremely long and complex transactions, you may need to
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perform sub-transactions that is, little mini transactions within the larger transaction In a normal transaction, if any of the commands within the transaction fail, the entire transaction is doomed for failure To demonstrate this, look at this example:
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test=> begin; BEGIN test=> update store"Product" set "Inventory" = 9 test-> where "ProductID" = 'LAP001'; ERROR: permission denied for relation Product test=> insert into store"Order" values ('BLU001', 'LAP001', 2, '100000', test(> 'ORD004'); ERROR: current transaction is aborted, commands ignored until end of transaction block test=> commit; ROLLBACK test=>
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In this example, the failed command was the first command in the transaction When the second command was processed, even though it should have succeeded, PostgreSQL indicated that it was ignored, as the transaction as a whole was already on its way to being rolled back No other commands will be processed by PostgreSQL until the COMMIT command is entered, completing the rollback of the transaction In some cases, though, you may want the parts of a transaction that succeed to be committed, even if commands farther down in the transaction fail PostgreSQL allows you to create mini transactions within the larger transaction If any of these mini transactions fails, PostgreSQL can still process the previous commands within the larger transaction The SAVEPOINT command allows you to set places within the transaction block where PostgreSQL can roll back to instead of aborting the entire transaction This allows you to save steps along the transaction process, and roll back to those steps if a future command fails, thus salvaging the work that was completed You can set multiple savepoints within the transaction You must assign each savepoint a name, and then use that name in the ROLLBACK command Here is an example of using a SAVEPOINT command to salvage a failed transaction:
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test=> begin; BEGIN test=> insert into store"Order" values ('BLU001', 'LAP001', 2, test(> '100000', 'ORD004'); INSERT 0 1 test=> SAVEPOINT first_point; SAVEPOINT test=> update store"Product" set "Inventory" = 9 test-> where "ProductID" = 'LAP001'; ERROR: permission denied for relation Product
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