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Figure 7-3 The B-Tree index method
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R5 R-Tree index R1 R2
4 R6 3 R4 2
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Figure 7-4 The R-Tree index method
If you are specifically working with multidimensional point values, use the R-Tree index method Otherwise, it is not any benefit over the standard B-Tree method The hash option uses a hash index, and is the oldest and least-used indexing algorithm available in PostgreSQL It uses simplified hashing techniques to sort data elements The hash index is only useful for comparing value equalities, and is less useful than the standard B-Tree method PostgreSQL recommends using the default B-Tree method instead of the hash index method The hash index method is mainly available for compatibility purposes with older systems The gist option uses a Generalized Search Tree (GiST) index This is a relatively new indexing method that utilizes several different indexing techniques in a conglomeration of algorithms This method is supported by PostgreSQL starting in version 73 The GiST index method allows administrators to define indexes for many different types of data, indexing on many different user-defined features Some examples of advanced GiST indexes are indexing three-dimensional objects and full-text indexing of complete text articles
TRANSACTIONS
As described in 1, PostgreSQL supports the database concept of transactions Transactions allow you to bundle multiple SQL commands together into one event that
PostgreSQL 8 for Windows
is either fully entered into the database or fully denied by the database If any one command in the transaction fails, the entire transaction fails A typical example of using transactions is when related data in multiple tables is being inserted into the tables In the store example, the Order table contains a column to indicate the quantity of a product a customer purchases Similarly, the Product table contains a column to indicate the number of items of a product currently in inventory Ideally, if an order is processed, your application must subtract the quantity purchased in an order from the product inventory count If either one of these transactions fails, the inventory count will be inaccurate If any of the SQL commands that were run within the transaction fails, all of the commands executed before the failed command must be undone, called a rollback PostgreSQL must keep track of all data entered or modified in the database during the transaction The following sections describe how to perform transactions in the PostgreSQL system
Basic Transactions
PostgreSQL supports transactions with the BEGIN and COMMIT SQL commands As you can probably guess, the BEGIN command indicates the start of a transaction block of commands, and the COMMIT command indicates the end of the transaction block By default, each SQL command processed by PostgreSQL is handled as a separate transaction If you are using psql and enter a SQL INSERT command to enter a new record in the Order table, then a SQL UPDATE command to update the Product table, PostgreSQL handles each command as a separate transaction If the INSERT command fails because the data entry clerk forgot to enter the OrderID column data, but the UPDATE command succeeds on the Product table, you will have a problem To force PostgreSQL to handle the two commands as a single transaction, use the BEGIN and COMMIT commands Here is an example of a failed transaction:
test=> begin; BEGIN test=> insert into store"Order" values ('BLU001', 'LAP001', 2, '100000', test(> 'ORD004'); INSERT 0 1 test=> update store"Product" set "Inventory" = 9 where "ProductID" = 'LAP001'; ERROR: permission denied for relation Product test=> commit; ROLLBACK test=> select * from store"Order"; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + BLU001 | LAP001 | 10 | $5,00000 | ORD001 BLU002 | LAP001 | 2 | $1,00000 | ORD002 BLU003 | DES001 | 1 | $30000 | ORD003 (3 rows) test=>
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