freelists is LIFO?

Jin

I read the following white paper:

http://BBS.wisky.org/doc/internal.docs/freelist%20Management%20with%20Oracle%208i%20.PDF

Here, he says:

"All types of freelists are implemented as a simple linked list using a mechanism of last-in first-out.

Now assume that we just a free list of Master and no process lists for free (and I guess if we have no free lists of process, can we have free Transaction lists?). That master free points list data block 5 and 5 points to the data block 7 data block, then the main free list will point to the data block 7 (because it points also to the tail). Now let assume us a new data block, the 100 block of data, becomes available. This block of data 7 now pointing to it, like the master list of free in the segment header. Now let say us that we had to do a lot of inserts. This means that a transaction will go to the MFL, look at the tail, go to the data block 100 and start making inserts so that it is the first to leave the free list? If so, what is the logic behind this? is it because this block of data is "hotter" than the others and is more likely to be in the database buffer cache? or is there a different reason (s)?

Thank you

Tags: Database

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    But I have'nt has encountered no problem to insert the record in the table after the setting of the block without rebuliding freelist, when the above question may encounter if I rebuild not freelist?
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  COUNT(*)
----------
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/
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/
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Connected.

SQL> select count(*) from emp;

  COUNT(*)
----------
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  2  /

40762 rows created.

SQL> commit
  2  /

Commit complete.

SQL> select count(*) from emp;

  COUNT(*)
----------
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    Aman... wrote:
    I'm not sure that I have read anywhere or have seen me this free list is corrupted after you use the package. And you can see on your own demo he didn't need advertising. So I would say that you have not really do as a confirmed declaration. Also use RMAN to perform block recovery.

    I haven't tested this - but if a block is on a freelist and corrupted then what will happen when you tried to find a block for insertion and your session chosen block corrupted free list? Although we can mark tables as 'skip corrupted' maybe that applies only when you tablescans. Just as we have a "fix index" procedure to run having satisfied damaged table blocks, perhaps we must 'fix freelists' to make sure that none of the freelists points to a block that is now marker for ORA-01578.

    Another possibility is that this procedure recreates freelists and freelist blocks if corruption is in the freelists - by analogy, there is a procedure (in the dbms_space package I think) to recreate the bitmaps of space segment if they beomce incompatible.

    Concerning
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    OK, well, because I think that any answer to this question leads to a lot more questions, I'll recommend you read book excellent in Stephan Haisley, available on MetaLink, sorry available on MOS, as Doc ID 157250.1. (Assuming that you can get into MOS and make it work!)

    Then keep in mind, the free list management is endangered of the door. With SAMS, free lists are no longer used to manage the blocks with free space. In the long term, it may be more practical to spend the time to understand how the SAMS.

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SQL> ----------------------
SQL> SELECT * FROM v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

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  1  DECLARE
  2  l_data_pump_handle    NUMBER;
  3  l_logfilename    VARCHAR2(30) := 'DWABI_'||to_char(sysdate, 'DDMMRRRRhh24miss') || '.log';
  4  l_expfilename    VARCHAR2(30) := 'DWABI_'||to_char(sysdate, 'DDMMRRRRhh24miss') || '.dmp';
  5  BEGIN
  6  l_data_pump_handle:= DBMS_DATAPUMP.OPEN(operation   => 'EXPORT',
  7                        job_mode    => 'TABLE',
  8                        remote_link => NULL,
  9                        job_name    => 'TEST_REMAP_DP',
10                        version     => 'LATEST');
11   DBMS_DATAPUMP.ADD_FILE(handle    => l_data_pump_handle,
12                     filename    => l_expfilename,
13                     directory => 'SAUBHIK',
14                     filetype    => DBMS_DATAPUMP.KU$_FILE_TYPE_DUMP_FILE);
15  DBMS_DATAPUMP.ADD_FILE(handle    => l_data_pump_handle,
16                     filename    => l_logfilename,
17                     directory => 'SAUBHIK',
18                     filetype    => DBMS_DATAPUMP.KU$_FILE_TYPE_LOG_FILE);
19   DBMS_DATAPUMP.metadata_filter(handle => l_data_pump_handle,
20                        name   => 'SCHEMA_EXPR',
21                        value  =>'= '||''''||'SCOTT'||'''');
22   DBMS_DATAPUMP.metadata_filter(handle => l_data_pump_handle,
23                        name   => 'NAME_EXPR',
24                        value  =>'= '||''''||'DEPT'||'''');
25  --We don't need index
26    DBMS_DATAPUMP.metadata_filter(handle => l_data_pump_handle,
27                        name   => 'EXCLUDE_PATH_EXPR',
28                        value  =>'=''INDEX''');
29  -- We don't copy table statistics!!
30    DBMS_DATAPUMP.metadata_filter(handle => l_data_pump_handle,
31                        name   => 'EXCLUDE_PATH_EXPR',
32                        value  =>'=''STATISTICS''');
33   -- We don't copy index statistics either!!
34    DBMS_DATAPUMP.metadata_filter(handle => l_data_pump_handle,
35                        name   => 'EXCLUDE_PATH_EXPR',
36                        value  =>'=''INDEX_STATISTICS''');
37    -- We do not need the data!!
38    DBMS_DATAPUMP.DATA_FILTER(
39     handle => l_data_pump_handle,
40     name => 'INCLUDE_ROWS',
41     value =>0
42     );
43  -- Start the export now.
44       DBMS_DATAPUMP.start_job(l_data_pump_handle);
45       dbms_output.put_line('Export started....');
46   -- Detach, it's finish!
47      DBMS_DATAPUMP.detach(l_data_pump_handle);
48      dbms_output.put_line('Export ended....');
49  EXCEPTION
50       WHEN OTHERS THEN
51        dbms_datapump.stop_job(l_data_pump_handle);
52        RAISE;
53*  END;
54  /
Export started....
Export ended....

PL/SQL procedure successfully completed.

SQL> SELECT * FROM user_datapump_jobs;

no rows selected

    Now, I'm importing that:

    SQL> ed
Wrote file afiedt.buf

  1  --DWABI_28052015143133.dmp
  2  DECLARE
  3  l_data_pump_imp_handle NUMBER;
  4  l_logfilename  VARCHAR2(30) := 'DWABI_'||to_char(sysdate, 'DDMMRRRRhh24miss') || '.log';
  5  ind       NUMBER;        -- loop index
  6   pct_done  NUMBER;        -- percentage complete
  7   job_state VARCHAR2(30);  -- track job state
  8   le        ku$_LogEntry;  -- WIP and error messages
  9   js        ku$_JobStatus; -- job status from get_status
10   jd        ku$_JobDesc;   -- job description from get_status
11   sts       ku$_Status;    -- status object returned by get_status
12  BEGIN
13  l_data_pump_imp_handle:= DBMS_DATAPUMP.OPEN(operation   => 'IMPORT',
14                        job_mode    => 'FULL',
15                        remote_link => NULL,
16                        job_name    => 'TEST',
17                        version     => 'LATEST');
18   DBMS_DATAPUMP.ADD_FILE(handle    => l_data_pump_imp_handle,
19                     filename    => 'DWABI_28052015143133.dmp',
20                     directory => 'SAUBHIK',
21                     filetype    => DBMS_DATAPUMP.KU$_FILE_TYPE_DUMP_FILE);
22  DBMS_DATAPUMP.ADD_FILE(handle    => l_data_pump_imp_handle,
23                     filename    => l_logfilename,
24                     directory => 'SAUBHIK',
25                     filetype    => DBMS_DATAPUMP.KU$_FILE_TYPE_LOG_FILE);
26   --If table is already there then do not import.
27   dbms_datapump.set_parameter(handle => l_data_pump_imp_handle,
28                              name => 'TABLE_EXISTS_ACTION',
29                              value =>'SKIP');
30    -- We need to remap the schema!!.
31    dbms_output.put_line('Changing Schema...');
32    DBMS_DATAPUMP.METADATA_REMAP (
33     handle => l_data_pump_imp_handle,
34     name => 'REMAP_SCHEMA',
35     old_value => 'SCOTT',
36     value=>'HR'
37     );
38    -- We need to remap the table!!. This is not working properly.
39    dbms_output.put_line('Changing Table...');
40    DBMS_DATAPUMP.METADATA_REMAP (
41     handle => l_data_pump_imp_handle,
42     name => 'REMAP_TABLE',
43     old_value => 'DEPT',
44     value=>'DEPT_HR',
45     object_type => NULL
46     );
47   -- Start the import now.
48       DBMS_DATAPUMP.start_job(l_data_pump_imp_handle);
49    -- monitor job
50    pct_done := 0;
51    job_state := 'UNDEFINED';
52    WHILE (job_state != 'COMPLETED') AND (job_state != 'STOPPED') LOOP
53      dbms_datapump.get_status(l_data_pump_imp_handle, dbms_datapump.ku$_status_job_error +
54      dbms_datapump.ku$_status_job_status +
55      dbms_datapump.ku$_status_wip, -1, job_state, sts);
56      js := sts.job_status;
57      -- If the percentage done changed, display the new value
58      IF js.percent_done != pct_done THEN
59        dbms_output.put_line('*** Job percent done = ' ||
60        to_char(js.percent_done));
61        pct_done := js.percent_done;
62      END IF;
63      -- If any work-in-progress (WIP) or error messages
64      -- were received for the job, display them.
65      IF (BITAND(sts.mask,dbms_datapump.ku$_status_wip) != 0) THEN
66        le := sts.wip;
67      ELSE
68        IF (BITAND(sts.mask,dbms_datapump.ku$_status_job_error) != 0) THEN
69          le := sts.error;
70        ELSE
71          le := NULL;
72        END IF;
73      END IF;
74      IF le IS NOT NULL THEN
75        ind := le.FIRST;
76        WHILE ind IS NOT NULL LOOP
77          dbms_output.put_line(le(ind).LogText);
78          ind := le.NEXT(ind);
79        END LOOP;
80      END IF;
81      --DBMS_LOCK.sleep (10);
82    END LOOP;
83    -- Indicate that the job finished and detach from it.
84    dbms_output.put_line('Job has completed');
85   -- Detach, it's finish!
86       DBMS_DATAPUMP.detach(l_data_pump_imp_handle);
87  EXCEPTION
88       WHEN OTHERS THEN
89        dbms_datapump.stop_job(l_data_pump_imp_handle);
90        RAISE;
91* END;
SQL> /
Changing Schema...
Changing Table...
Master table "SYS"."TEST" successfully loaded/unloaded
Starting "SYS"."TEST":
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
ORA-39083: Object type CONSTRAINT failed to create with error:
ORA-00942: table
or view does not exist
Failing sql is:
ALTER TABLE "HR"."DEPT" ADD CONSTRAINT
"PK_DEPT" PRIMARY KEY ("DEPTNO") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE
DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS"  ENABLE

Job "SYS"."TEST" completed with 1 error(s) at 15:04:02
Job has completed

PL/SQL procedure successfully completed.

SQL>

    If you look at the failing sql code, it is clear that the name of the table in the constraint definition has not changed, but the DEPT_HR table is created in the HR schema without constraint. What's not here?

    Post edited by: Massimiliano edited the subject line, because he said as DBMS_METADATA. Changed to DBMS_DATAPUMP.

    Hello

    This is a bug in 11.2.0.1 I think - please this Ref

    Oracle Support Document 1609238.1 (REMAP_TABLE on IMPDP FAILS WITH ORA-942) can be found at: https://support.oracle.com/epmos/faces/DocumentDisplay?id=1609238.1

    See you soon,.

    Rich

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