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Before we perform this mass deletion, we have no blocks on the FREELIST and there are 1,043 blocks in the leafs of the index, holding data Now, we ll perform the delete and measure the space utilization again: ops$tkyte@ORA11GR2> delete from big_table where id <= 250000; 250000 rows deleted ops$tkyte@ORA11GR2> commit; Commit complete ops$tkyte@ORA11GR2> declare 2 l_freelist_blocks number; 3 begin 4 dbms_spacefree_blocks 5 ( segment_owner => user, 6 segment_name => 'BIG_TABLE_PK', 7 segment_type => 'INDEX', 8 freelist_group_id => 0, 9 free_blks => l_freelist_blocks ); 10 dbms_outputput_line( 'blocks on freelist = ' || l_freelist_blocks ); 11 dbms_statsgather_index_stats 12 ( user, 'BIG_TABLE_PK' ); 13 end; 14 / blocks on freelist = 520 PL/SQL procedure successfully completed.

Note Always try to keep your audit options to the minimum necessary to meet your auditing objectives. As a DBA, you should keep a close watch on the System tablespace and the SYS.AUD$ table when auditing is turned on. If the SYS.AUD$ table gets full, further connections and DML activity in the database might come to a standstill. You may want to archive and purge the records from the SYS.AUD$ table periodically.

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Sufficient information is encoded in the ROWID to locate the row on disk, as well as identify the object the ROWID points to (the table and so on) UROWID: A UROWID is a universal ROWID and is used for tables, such as IOTs and tables accessed via gateways to heterogeneous databases, that do not have fixed ROWIDs The UROWID is a representation of the primary key value of the row and, hence, will vary in size depending on the object it points to Many types are apparently missing from the preceding list, such as INT, INTEGER, SMALLINT, FLOAT, REAL, and others These types are actually implemented on top of one of the base types in the preceding list that is, they are synonyms for the native Oracle type Additionally, datatypes such as XMLType, SYSANYTYPE, and SDO_GEOMETRY are not listed either, as we will not.

Database authentication refers to the authentication of the user account and password directly by Oracle. However, although database authentication is easy to set up, it isn t the only or the best means of authenticating Oracle users. You have a choice of several ways of authenticating database users ways that aren t dependent on the database. The following section covers the most common means of Oracle user authentication, which is to authenticate users through the database. After this, I briefly discuss some other means of user authentication external, proxy, and centralized user authentication.

ops$tkyte@ORA11GR2> select leaf_blocks from user_indexes 2 where index_name = 'BIG_TABLE_PK'; LEAF_BLOCKS ----------523 As we can see, over half of the index is on the FREELIST now (520 blocks) and there are only 523 leaf blocks If we add 523 and 520, we get the original 1043 This means the blocks are totally empty and ready to be reused (blocks on the FREELIST for an index must be empty, unlike blocks on the FREELIST for a heap organized table) This demonstration highlights two points: Space is reused on index blocks as soon as a row comes along that can reuse it When an index block is emptied, it can be taken out of the index structure and may be reused later.

Database authentication is the standard verification of a user s access privileges by using database passwords. If you re relying on the database to authenticate your users, you should have a strong password-management policy. Here s an example of database authentication: SQL> CREATE USER scott IDENTIFIED BY tiger;

cover them in this book. They are complex object types comprising a collection of attributes along with the methods (functions) that operate on those attributes. They are made up of the basic datatypes listed previously and are not truly datatypes in the conventional sense, but rather an implementation, a set of functionality, that you may make use of in your applications. Now, let s take a closer look at these basic datatypes.

Depending on how you create a database (manually or using the DBCA), Oracle will have several accounts with default passwords. If you create a tablespace manually, you may only have SYS, SYSTEM, DBSNMP (the Oracle Intelligent Agent account), and OUTLN (the username for managing the outlines feature). In some cases, the user scott (owner of the old Oracle demo database schema) is also created with the default password of tiger. A standard database created by the DBCA may have up to 32 default user accounts.

This is probably the genesis of this myth in the first place: blocks are not visible as having free space on them in an index structure as they are in a table In a table, you can see blocks on the FREELIST, even if they have data on them In an index, you will only see completely empty blocks on the FREELIST; blocks that have at least one index entry (and remaining free space) will not be as clearly visible..

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