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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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Listing 5-1. 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 ------------------ORDERS SQL> FILE_ID -------397 BLOCK_ID --------32811
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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 ----------397 SQL> HEADER_BLOCK -----------32811
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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 5-2 shows part of the output of this command. Listing 5-2. A Sample Block Dump Dump file /a03/app/oracle/admin/pasu/udump/pasu_ora_29673.trc ... Start dump data blocks tsn: 110 file#: 397 minblk 32811 maxblk 32811 buffer tsn: 110 rdba: 0x6340802b (397/32811) scn: 0x0001.610ac43d seq: 0x01 flg: 0x04 tail: 0xc43d2301 frmt: 0x02 chkval: 0x882e type: 0x23=PAGETABLE SEGMENT HEADER Extent Control Header ---------------------------------------------------------------Extent Header:: spare1: 0 spare2: 0 #extents: 59 #blocks: 483328 last map 0x00000000 #maps: 0 offset: 2720 Highwater:: 0x63826009 ext#: 58 blk#: 8192 ext size: 8192 #blocks in seg. hdr's freelists: 0 #blocks below: 479093 mapblk 0x00000000 offset: 58 Unlocked
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-------------------------------------------------------Low HighWater Mark : Highwater:: 0x6381ef7e ext#: 4 blk#: 3957 ext size: 8192 #blocks in seg. hdr's freelists: 0 #blocks below: 36725 mapblk 0x00000000 offset: 4 Level 1 BMB for High HWM block: 0x63824028 Level 1 BMB for Low HWM block: 0x6381e018 -------------------------------------------------------Segment Type: 1 nl2: 0 blksz: 8192 fbsz: 0 L2 Array start offset: 0x00001438 First Level 3 BMB: 0x6340802a L2 Hint for inserts: 0x63408029 Last Level 1 BMB: 0x63824028 Last Level II BMB: 0x63412029 Last Level III BMB: 0x6341202a Map Header:: next 0x00000000 #extents:59 obj#:4916681 flag: 0x10000000 . . . End dump data blocks tsn: 110 file#: 397 minblk 32811 maxblk 32811 It is possible to interpret and read dump data to find details about the information in a table or an index. Let s look at a simple example that shows how you can get the table name from the preceding block dump information. Take the obj# shown in second-to-last line, and run the following query: SQL> SELECT name 2 FROM sys.obj$ 3*WHERE obj#='4916681'; NAME --------------PERSONS SQL> The previous example is trivial, but it demonstrates how you can derive information straight from a database block dump. Of course, if you need more significant data from the dumps, you d have to employ more rigorous techniques.
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When several contiguous data blocks are combined, they are called an extent. When you create a database object like a table or an index, you allocate it an initial amount of space, called the initial extent, and you also specify the size of the next extent. Once allocated to a table or an index, the extents remain allocated to that particular object, unless you drop the object from the database, in which case the space will revert to the pool of allocatable free space in the database.
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A set of extents forms the next higher unit of data storage, the segment. Oracle calls all the space allocated to any particular database object a segment. So if you have a table called Customer, you simply refer to the space allocated to it as the Customer segment. When you create an index, it will have its own segment named after the index name. Data and index segments are the most common type of Oracle segments. There are also temporary segments that the database uses for transactions involving sorting, for example, and undo segments, which the database uses to store undo information.
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