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Extents are a collection of contiguous Oracle data blocks, and they re the smallest units with which you can allocate space to various database objects. The DBA_EXTENTS view is extremely useful for finding out the number of extents your database objects have, and also for getting alerts before you hit a maximum extents barrier. Listing 23-13 shows the structure of the DBA_EXTENTS view. Listing 23-13. The DBA_EXTENTS View SQL> DESC DBA_EXTENTS Name Null Type ----------------------------------------OWNER VARCHAR2(30) SEGMENT_NAME VARCHAR2(81) PARTITION_NAME VARCHAR2(30) SEGMENT_TYPE VARCHAR2(18) TABLESPACE_NAME VARCHAR2(30) EXTENT_ID NUMBER FILE_ID NUMBER BLOCK_ID NUMBER BYTES NUMBER BLOCKS NUMBER RELATIVE_FNO NUMBER SQL> You can use the DBA_EXTENTS view in combination with several other data dictionary views to help manage extent issues, as shown in the query in Listing 23-14. The results of the query indicate that there s no segment with more than 20 extents in it. The number 20 is arbitrary you can replace it with any reasonable number of extents. Listing 23-14. Using the DBA_EXTENTS View SQL> SELECT x.segment_name, 2 x.segment_type, 3 sum(x.bytes/1024/1024) megabytes, 4 count(x.bytes) count, 5 x.tablespace_name 6 FROM DBA_EXTENTS x, 7 dba_tables t, 8 dba_indexes i 9 WHERE x.segment_name in ('TABLE','INDEX') 10 AND x.owner = t.owner(+) 11 AND x.owner=i.owner(+) 12 GROUP BY 13. x.OWNER,x.SEGMENT_NAME,x.SEGMENT_TYPE,x.TABLESPACE_NAME 14 HAVING COUNT(x.bytes) >= 20 15* ORDER BY 1,2; no rows selected SQL>

The DBA_FREE_SPACE view tells you how much free space you have in the database at any given moment. You can use the query in Listing 23-15 to find out how much free space you have in your tablespaces. Note that space belonging to a table that you dropped, and is in the Recycle Bin, shows up as free space in this view. However, you can t use it for any other object. You get the space back only after you permanently remove the item with the ALTER TABLE . . . PURGE statement. Listing 23-15. Querying the DBA_FREE_SPACE View SQL> SELECT tablespace_name, SUM(bytes) 2 FROM DBA_FREE_SPACE 3* GROUP BY tablespace_name; TABLESPACE_NAME SUM(BYTES) ------------------------------ ---------CWMLITE 11141120 DRSYS 10813440 EXAMPLE 262144 INDX 26148864 ODM 11206656 SYSTEM 4325376 TOOLS 4128768 UNDOTBS1 202047488 USERS 26148864 XDB 196608 10 rows selected. SQL>

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Because the interrogator is in control, it can decide when and how often to check respondents and in what order A complication may arise if the respondents have dynamically changing priorities or highly variable traffic patterns, in which cases push interactions are often more suitable..

starting a new program. So, SQL*Plus can fork (copy itself) and then exec the Oracle binary, overlaying the copy of itself with this new program.

As you re aware, the Oracle database contains several kinds of segments: table, index, undo, and so on. The DBA_SEGMENTS view provides you with detailed information on the various segments in the database, as seen in the example in Listing 23-16. Listing 23-16. Querying the DBA_SEGMENTS View SQL> 2 3 4 5 6 7 8 9* SELECT tablespace_name, segment_name, segment_type, extents, /*Number of extents in the segment*/ blocks, /*Number of db blocks in the segment*/ bytes /*Number of bytes in the segment*/ FROM dba_segments WHERE owner = 'HR'; SEGMENT_NAME SEGMENT_TYPE EXTENTS BLOCKS BYTES ------------ ------------- ------- ------ -----REGIONS TABLE 1 8 65,536 LOCATIONS TABLE 1 8 65,536 DEPARTMENTS TABLE 1 8 65,536 JOBS TABLE 1 8 65,536 EMPLOYEES TABLE 1 8 65,536 JOB_HISTORY TABLE 1 8 65,536 REG_ID_PK INDEX 1 8 65,536

EXAMPLE COUNTRY_PK EXAMPLE LOC_ID_PK EXAMPLE DEPT_ID_PK EXAMPLE DEPT_LOC_IX . . . 25 rows selected. SQL>

We can see this parent/child process creation clearly on UNIX when we run the client and server on the same machine: ops$tkyte@ORA10G> select a.spid dedicated_server, 2 b.process clientpid 3 from v$process a, v$session b 4 where a.addr = b.paddr 5 and b.sid = (select sid from v$mystat where rownum=1) 6 / DEDICATED_SE CLIENTPID ------------ -----------5114 5112 ops$tkyte@ORA10G> !/bin/ps PID TTY STAT TIME 5112 pts/1 R 0:00 5114 S 0:00 -p 5114 5112 COMMAND sqlplus oracleora10g (DESCRIPTION=(LOCAL=YES)..(PROTOCOL=beq)))

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