In addition to Weibo, there is also WeChat
Please pay attention
WeChat public account
Shulou
2025-04-03 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
Share
Shulou(Shulou.com)06/01 Report--
First, create a piece of data with row links but no row migration by inserting data larger than the basic block size (8K) at a time
SQL > insert into t_pctfree values (10002) dbmsroom.string (2000), dbms_random.string (2000))
1 row created.
SQL > commit
Commit complete.
SQL > alter system switch logfile
System altered.
SQL > /
System altered.
SQL > /
System altered.
Use dump to make sure that this row of data has a row link but no row migration
SQL > select dbms_rowid.rowid_block_number (rowid) block_id from t_pctfree where id=10002
BLOCK_ID
-
51036
SQL > alter system dump datafile 5 block 51036
System altered.
SQL > oradebug setmypid
Statement processed.
SQL > oradebug tracefile_name
/ u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_25082.trc
[oracle@localhost ~] $more / u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_25082.trc
Block_row_dump:
Tab 0, row 0, @ 0xfe4
Tl: 4020 fb:-- Hmurf Fmuri-lb: 0x1 cc: 3
Nrid: 0x0140c758.1
Col 0: [4] c3 02 01 03
Col 1: [2000]
55 51 46 4b 57 4c 4a 48 4b 47 4e 43 43 59 42 46 56 44 54 48 54 50 42 51 47
58 59 54 54 41 48 45 4e 5a 56 4c 47 44 4e 55 43 53 43 51 4d 57 4e 54 59 5a
48 48 4c 48 41 41 4e 44 45 51 4c 51 4c 58 47 4a 4f 4a 42 4f 41 59 57 57 58
46 4d 50 4a 45 57 46 42 45 48 48 46 41 44 5a 43 53 55 59 53 4a 42 52 5a 4f
4b 4f 52 56 56 46 4e 58 57 4a 46 4b 4a 46 56 54 59 51 59 4a 49 51 42 56 4e
53 48 59 4e 58 55 57 44 41 41 53 4c 4f 43 45 52 4b 4c 4d 46 58 4d 53 50 51
Third, confirm whether column 1 is the data just inserted
SQL > var n number
SQL > exec dbms_stats.convert_raw_value ('c3020103)
PL/SQL procedure successfully completed.
SQL > print: n
N
-
10002
Therefore, it can be confirmed that this block (51036) stores 1 and 2 columns of information, and the rest is listed on another block, unlike when rows are migrated, there is only nrid in the block information
4. View the information of linked blocks
SQL > select dbms_utility.DATA_BLOCK_ADDRESS_FILE (to_number ('0140c758)) file#,dbms_utility.DATA_BLOCK_ADDRESS_BLOCK (to_number (' 0140c758)) block# from dual
FILE# BLOCK#
--
5 51032
SQL > alter system dump datafile 5 block 51032
System altered.
SQL > oradebug setmypid
Statement processed.
SQL > oradebug tracefile_name
/ u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_25101.trc
Tl: 6012 fb:-Lmuri-lb: 0x2 cc: 3
Col 0: [2000]
4e 49 59 52 43 52 47 41 44 44 4e 54 43 5a 4d 4d 53 47 55 55 4d 56 55 44 55
4f 46 53 50 47 4d 50 52 43 45 51 57 52 41 44 4c 55 49 55 59 4c 57 58 5a 52
44 50 41 45 52 48 57 45 4b 53 58 54 50 56 47 52 4b 5a 52 4d 50 44 42 43 50
4b 48 51 41 54 47 49 48 50 4c 45 57 4f 48 4f 4a 55 4c 50 59 52 4d 53 55 50
59 4d 41 41 55 53 5a 48 56 52 41 44 4e 53 49 4a 58 4c 4a 4e 47 54 55 44 43
4f 56 4f 55 4a 41 46 44 42 55 41 42 48 58 47 56 57 52 55 47 52 44 4a 42 48
Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.
Views: 0
*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.
Continue with the installation of the previous hadoop.First, install zookooper1. Decompress zookoope
"Every 5-10 years, there's a rare product, a really special, very unusual product that's the most un
© 2024 shulou.com SLNews company. All rights reserved.