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Batch updates offer a significant performance improvement over a large number of individual statement executions. A typical scenario for batch update is when you need to insert a large number of rows (to import them from an external source, for example). The JdbcTemplate offers two batchUpdate methods. One takes a simple array of strings as its argument and executes the SQL statements in the array in a batch. This is useful when performing a large number of SQL statements that do not have any parameters. The second overload of the batchUpdate method takes a single String representing the SQL statement and a BatchPreparedStatementSetter. The JdbcTemplate class calls the implementation of BatchPreparedStatementSetter.setValues(PreparedStatement, int) for every statement in the batch. Listing 9-14 shows examples of both batchUpdate calls.

Listing 9-14. JdbcTemplate.batchUpdate Example class JdbcTemplateDemo { private static Log logger = LogFactory.getLog(JdbcTemplateDemo.class); private JdbcTemplate jdbcTemplate; private void runBatch() { final int count = 2000; final List<String> firstNames = new ArrayList<String>(count); final List<String> lastNames = new ArrayList<String>(count); for (int i = 0; i < count; i++) { firstNames.add("First Name " + i); lastNames.add("Last Name " + i); } this.jdbcTemplate.batchUpdate( "insert into t_customer (" + "id, first_name, last_name, last_login, comments) " + "values ( , , , , )", new BatchPreparedStatementSetter() { public void setValues(PreparedStatement ps, int i) throws SQLException { ps.setLong(1, i + 10); ps.setString(2, firstNames.get(i)); ps.setString(3, lastNames.get(i)); ps.setNull(4, Types.TIMESTAMP); ps.setNull(5, Types.CLOB); } public int getBatchSize() { return count; } }); this.jdbcTemplate.batchUpdate(new String[] { "update t_customer set first_name = 'FN#'||id", "delete from t_customer where id > 2" }); } } The example shows how to insert 2,000 rows into the t_customer table in a batch (using a single SQL statement with many different values) and how to perform two different SQL statements in a batch. It is important to remember that running statements in a batch is not the same as running them in a transaction; there is no transactional behavior.

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Checks whether the database has suspect database pages. A database page is set suspect by error 824. This error occurs when a logical consistency error is detected during a read operation, which frequently indicates data corruption caused by a faulty I/O subsystem component. When the SQL Server Database Engine detects a suspect page, the page ID is recorded in the msdbo.dbo.suspect_pages table. This is a severe error condition that threatens database integrity and must be corrected immediately. Best practices recommendations: Review the SQL Server error log for the details of the 824 error for this database. Complete a full database consistency check (DBCC CHECKDB). Implement the user actions defined in MSSQLSERVER_824. Checks if the PAGE_VERIFY database option is not set to CHECKSUM to provide a high level of data-file integrity. When CHECKSUM is enabled for the PAGE_VERIFY database option, the SQL Server Database Engine calculates a checksum over the contents of the whole page, and stores the value in the page header when a page is written to disk. When the page is read from disk, the checksum is recomputed and compared to the checksum value that is stored in the page header. This helps provide a high level of data-file integrity.

To further elaborate on this, we can say that data is different from the inside than it is from the outside. The data transferred to and from the service is passed in messages, and both the sender and the receiver must understand these messages and the format of the data. The schema helps them achieve this understanding (see Figure 4-5). This means that the schema must use an independent definition so that the schema does not change over time. A consumer using a schema will have problems if we update it. A schema change can break the consumer s implementation of the service if we don t handle changes in a good way. The schema describes what data should be sent with the request and what data we will get in the response of the service.

The RdbmsOperation abstract class is the root of a hierarchy of classes that let you write specialized subclasses to perform specific operations (update, insert, delete, and select). Take a look at Figure 9-5, which shows the class diagram of the RdbmsOperation subclasses.

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