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The DB_BLOCK_SIZE initialization parameter determines the standard block size in your Oracle database, and it can range from 2KB to 32KB. The system tablespace is always created with the standard block size, and Oracle lets you specify up to four additional nonstandard block sizes. For example, you can have 2KB, 4KB, 8KB, 16KB, and 32KB block sizes all within the same database the reasons you might wish to do this are discussed shortly, in the Tablespaces section. If you choose to configure multiple Oracle block sizes, you must also configure corresponding subcaches in the buffer cache of the system global area (SGA), which is Oracle s memory allocation, as you ll learn in the Understanding Main Memory section of this chapter. Multiple data block sizes aren t always necessary, and you ll do just fine in most cases with one standard Oracle block size. Multiple block sizes are useful primarily when transporting tablespaces between databases with different database block sizes.

Example 13 A temperature-controlled industrial vat is used to mix three chemicals. After the first two

All data blocks can be divided into two main parts: the row data portion and the free space portion. (There are also other smaller areas, such as overhead and header space for maintenance purposes.) The row data section of data blocks contains the data stored in the tables or their indexes. The free space section is the space left in the Oracle block for new data to be inserted or for existing rows in the block to be extended. Sometimes it may be useful to find out exactly what data is in a particular block or to find out which block contains a particular piece of data. You can actually see what s inside a data block by

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Note If you are already using a connection pooling feature in your application (e.g., you are using the

dumping the block contents Oracle blocks can be dumped at the operating system level (referred to as binary dumps), and you can also perform Oracle-formatted block dumps The most common reason for performing a block dump is to investigate block corruption, which may be caused by operating system or Oracle software errors, hardware defects, or memory or I/O caching problems Oracle does have tools that can help you restore data from corrupted data blocks, and you can adopt several other strategies to recover from data block corruption; you ll learn about these strategies in 16 Let s look at what s actually in an Oracle data block First, before you do a data dump, you need to find out which data file and data block you want to dump Listing 4-1 shows a query that enables you to determine the file and block IDs Listing 4-1.

chemicals are loaded at room temperature, the vat contents must be raised to a temperature of at least 95 degrees Celsius before loading a third chemical. The vat has a heater that a system controller (SysCon) can turn on and off. The vat status is reported by a sensor that returns the value 0 if the temperature is below 95; otherwise, it returns the value 1. SysCon turns on the vat heater and then continues on with other chores. Periodically, SysCon reads the vat status. Once the vat reaches 95 degrees, SysCon starts adding the third chemical. The diagram in Figure 9-10 shows the interactions.

Query to Identify File and Block IDs SQL> SELECT segment_name, file_id, block_id FROM dba_extents WHERE owner = 'OE' AND segment_name LIKE 'ORDERS%'; SEGMENT_NAME FILE_ID BLOCK_ID ------------------------- ---------- ------------------------------ORDERS 397 32811 SQL> You can alternatively use the following query to get the same information: SQL> SELECT header_file,header_block FROM dba_segments WHERE segment_name = 'PERSONS'; HEADER_FILE HEADER_BLOCK ----------- -----------397 32811 SQL> Next, you issue the following command, using the appropriate file and block numbers, to get a dump of the block you need: SQL> ALTER SYSTEM DUMP DATAFILE 397 BLOCK 32811; System altered SQL> The preceding command will produce a block dump in the default trace directory (UDUMP) of the Oracle database Listing 4-2 shows part of the output of this command Listing 4-2 A Sample Block Dump Dump file /a03/app/oracle/admin/pasu/udump/pasu_ora_29673trc Oracle Database 10g Enterprise Edition Release 10102.

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