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From "Sundar Narayanaswamy (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5487) Primary key disk pages not reclaimed when using SYSCS_UTIL.SYSCS_COMPRESS_TABLE with just the purge_rows option
Date Sat, 29 Oct 2011 04:51:32 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sundar Narayanaswamy updated DERBY-5487:
----------------------------------------

    Description: 
When I continuously insert data, delete the inserted data then compress with purge_rows option
in a loop, space is not reclaimed from the primary key file. The inserts are committed every
10000 rows, deletes committed every 50000 rows. All the rows that were inserted are deleted.
The primary key values continually increase (across the inserts) . All the activities occur
on a single thread. Included below is the space table output after each iteration in the loop:

As can be seen below and in the screenshot attached, the NumAllocatedpages for SQL111029001155930
is continuously increasing. This increase does not happen if the primary key values are reset
after each iteration (ie, primary key values for new inserts are in the same range as deleted
rows). 

Iteration: 0
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   803            1                   4096
     3289088             
SQL111029003533400  1         238                 31             179                 4096
     126976              
LOC_INDEX           1         211                 185            119                 4096
     757760              
Database size: 12993 KB

Iteration: 1
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   816            1                   4096
     3342336             
SQL111029003533400  1         324                 192            200                 4096
     786432              
LOC_INDEX           1         1                   406            1                   4096
     1662976             
Database size: 17112 KB

Iteration: 2
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         7                   810            1                   4096
     3317760             
SQL111029003533400  1         579                 23             294                 4096
     94208               
LOC_INDEX           1         394                 28             2                   4096
     114688              
Database size: 22821 KB

Iteration: 3
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   816            0                   4096
     3342336             
SQL111029003533400  1         631                 227            451                 4096
     929792              
LOC_INDEX           1         5                   437            3                   4096
     1789952             
Database size: 18054 KB

Iteration: 4
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         735                 174            460                 4096
     712704              
LOC_INDEX           1         1                   441            1                   4096
     1806336             
Database size: 15632 KB

Iteration: 5
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         4                   814            0                   4096
     3334144             
SQL111029003533400  1         992                 21             690                 4096
     86016               
LOC_INDEX           1         378                 64             127                 4096
     262144              
Database size: 25633 KB

Iteration: 6
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         1071                199            744                 4096
     815104              
LOC_INDEX           1         5                   437            3                   4096
     1789952             
Database size: 19763 KB

Iteration: 7
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         1320                29             932                 4096
     118784              
LOC_INDEX           1         395                 47             11                  4096
     192512              
Database size: 26911 KB

Iteration: 8
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         1421                177            1014                4096
     724992              
LOC_INDEX           1         1                   441            1                   4096
     1806336             
Database size: 21003 KB

Iteration: 9
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         1593                106            1063                4096
     434176              
LOC_INDEX           1         1                   441            1                   4096
     1806336             
Database size: 29662 KB

Iteration: 10
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         1736                135            1083                4096
     552960              
LOC_INDEX           1         3                   439            2                   4096
     1798144             
Database size: 22035 KB

Iteration: 11
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         3                   815            0                   4096
     3338240             
SQL111029003533400  1         1967                48             1135                4096
     196608              
LOC_INDEX           1         393                 49             3                   4096
     200704              
Database size: 17909 KB

Iteration: 12
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         6                   812            0                   4096
     3325952             
SQL111029003533400  1         2194                51             1391                4096
     208896              
LOC_INDEX           1         396                 46             108                 4096
     188416              
Database size: 21620 KB

Iteration: 13
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         3                   815            0                   4096
     3338240             
SQL111029003533400  1         2445                27             1535                4096
     110592              
LOC_INDEX           1         318                 124            107                 4096
     507904              
Database size: 21314 KB

Iteration: 14
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         7                   811            0                   4096
     3321856             
SQL111029003533400  1         2672                51             1718                4096
     208896              
LOC_INDEX           1         410                 32             100                 4096
     131072              
Database size: 23232 KB

Iteration: 15
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         2794                156            1842                4096
     638976              
LOC_INDEX           1         1                   441            1                   4096
     1806336             
Database size: 20235 KB

Iteration: 16
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         2933                139            1863                4096
     569344              
LOC_INDEX           1         3                   439            2                   4096
     1798144             
Database size: 35124 KB

Iteration: 17
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         5                   813            0                   4096
     3330048             
SQL111029003533400  1         3177                34             2002                4096
     139264              
LOC_INDEX           1         385                 57             15                  4096
     233472              
Database size: 25820 KB

Iteration: 18
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         3254                202            2102                4096
     827392              
LOC_INDEX           1         3                   439            2                   4096
     1798144             
Database size: 22220 KB

Iteration: 19
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         2                   816            0                   4096
     3342336             
SQL111029003533400  1         3509                23             2339                4096
     94208               
LOC_INDEX           1         397                 45             146                 4096
     184320              
Database size: 35770 KB

Iteration: 20
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         2                   816            0                   4096
     3342336             
SQL111029003533400  1         3765                22             2555                4096
     90112               
LOC_INDEX           1         354                 88             110                 4096
     360448              
Database size: 28916 KB

Iteration: 21
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         3816                227            2608                4096
     929792              
LOC_INDEX           1         3                   439            2                   4096
     1798144             
Database size: 30791 KB

Iteration: 22
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         4076                18             2694                4096
     73728               
LOC_INDEX           1         352                 90             23                  4096
     368640              
Database size: 24658 KB

Iteration: 23
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         8                   810            0                   4096
     3317760             
SQL111029003533400  1         4292                62             2882                4096
     253952              
LOC_INDEX           1         415                 27             62                  4096
     110592              
Database size: 30294 KB

Iteration: 24
ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages    PageSize
 EstimSpaceSaving    
LOCATION            0         1                   817            0                   4096
     3346432             
SQL111029003533400  1         4340                230            2932                4096
     942080              
LOC_INDEX           1         1                   444            1                   4096
     1818624             
Database size: 30585 KB


------------------ Java Information ------------------
Java Version:    1.6.0_21
Java Vendor:     Sun Microsystems Inc.
Java home:       c:\development\
Java classpath:  .;derby-10.8.1.2.jar
OS name:         Windows 7
OS architecture: x86
OS version:      6.1
Java user name:  testuser
Java user home:  C:\Users\testuser
Java user dir:   C:\temp\Derby
java.specification.name: Java Platform API Specification
java.specification.version: 1.6
java.runtime.version: 1.6.0_21-b06
--------- Derby Information --------
JRE - JDBC: Java SE 6 - JDBC 4.0
[C:\temp\Derby\derby-10.8.1.2.jar] 10.8.1.2 - (1095077)
------------------------------------------------------
----------------- Locale Information -----------------
------------------------------------------------------



  was:
When I continuously insert data, delete the inserted data then compress with purge_rows option
in a loop, space is not reclaimed from the primary key file. The inserts are committed
every 10000 rows, deletes committed every 50000 rows. All the rows that were inserted are
deleted. The primary key values continually increase (across the inserts) . All the activities
occur on a single thread. Included below is the space table output after each iteration in
the loop:

As can be seen in the screenshot attached, the NumAllocatedpages for SQL111029001155930 is
continuously increasing. This increase does not happen if the primary key values are reset
after each iteration (ie, primary key values for new inserts are in the same range as deleted
rows). 



------------------ Java Information ------------------
Java Version:    1.6.0_21
Java Vendor:     Sun Microsystems Inc.
Java home:       c:\development\
Java classpath:  .;derby-10.8.1.2.jar
OS name:         Windows 7
OS architecture: x86
OS version:      6.1
Java user name:  testuser
Java user home:  C:\Users\testuser
Java user dir:   C:\temp\Derby
java.specification.name: Java Platform API Specification
java.specification.version: 1.6
java.runtime.version: 1.6.0_21-b06
--------- Derby Information --------
JRE - JDBC: Java SE 6 - JDBC 4.0
[C:\temp\Derby\derby-10.8.1.2.jar] 10.8.1.2 - (1095077)
------------------------------------------------------
----------------- Locale Information -----------------
------------------------------------------------------



    
> Primary key disk pages not reclaimed when using SYSCS_UTIL.SYSCS_COMPRESS_TABLE with
just the purge_rows option
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5487
>                 URL: https://issues.apache.org/jira/browse/DERBY-5487
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.8.1.2
>         Environment: Windows 7, Embedded Derby mode
>            Reporter: Sundar Narayanaswamy
>              Labels: derby_triage10_8, patch
>             Fix For: 10.8.1.2
>
>         Attachments: DerbyInPlaceCompress.java, screenshot-1.jpg
>
>
> When I continuously insert data, delete the inserted data then compress with purge_rows
option in a loop, space is not reclaimed from the primary key file. The inserts are committed
every 10000 rows, deletes committed every 50000 rows. All the rows that were inserted are
deleted. The primary key values continually increase (across the inserts) . All the activities
occur on a single thread. Included below is the space table output after each iteration in
the loop:
> As can be seen below and in the screenshot attached, the NumAllocatedpages for SQL111029001155930
is continuously increasing. This increase does not happen if the primary key values are reset
after each iteration (ie, primary key values for new inserts are in the same range as deleted
rows). 
> Iteration: 0
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   803            1                  
4096      3289088             
> SQL111029003533400  1         238                 31             179                
4096      126976              
> LOC_INDEX           1         211                 185            119                
4096      757760              
> Database size: 12993 KB
> Iteration: 1
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   816            1                  
4096      3342336             
> SQL111029003533400  1         324                 192            200                
4096      786432              
> LOC_INDEX           1         1                   406            1                  
4096      1662976             
> Database size: 17112 KB
> Iteration: 2
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         7                   810            1                  
4096      3317760             
> SQL111029003533400  1         579                 23             294                
4096      94208               
> LOC_INDEX           1         394                 28             2                  
4096      114688              
> Database size: 22821 KB
> Iteration: 3
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   816            0                  
4096      3342336             
> SQL111029003533400  1         631                 227            451                
4096      929792              
> LOC_INDEX           1         5                   437            3                  
4096      1789952             
> Database size: 18054 KB
> Iteration: 4
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         735                 174            460                
4096      712704              
> LOC_INDEX           1         1                   441            1                  
4096      1806336             
> Database size: 15632 KB
> Iteration: 5
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         4                   814            0                  
4096      3334144             
> SQL111029003533400  1         992                 21             690                
4096      86016               
> LOC_INDEX           1         378                 64             127                
4096      262144              
> Database size: 25633 KB
> Iteration: 6
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         1071                199            744                
4096      815104              
> LOC_INDEX           1         5                   437            3                  
4096      1789952             
> Database size: 19763 KB
> Iteration: 7
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         1320                29             932                
4096      118784              
> LOC_INDEX           1         395                 47             11                 
4096      192512              
> Database size: 26911 KB
> Iteration: 8
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         1421                177            1014               
4096      724992              
> LOC_INDEX           1         1                   441            1                  
4096      1806336             
> Database size: 21003 KB
> Iteration: 9
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         1593                106            1063               
4096      434176              
> LOC_INDEX           1         1                   441            1                  
4096      1806336             
> Database size: 29662 KB
> Iteration: 10
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         1736                135            1083               
4096      552960              
> LOC_INDEX           1         3                   439            2                  
4096      1798144             
> Database size: 22035 KB
> Iteration: 11
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         3                   815            0                  
4096      3338240             
> SQL111029003533400  1         1967                48             1135               
4096      196608              
> LOC_INDEX           1         393                 49             3                  
4096      200704              
> Database size: 17909 KB
> Iteration: 12
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         6                   812            0                  
4096      3325952             
> SQL111029003533400  1         2194                51             1391               
4096      208896              
> LOC_INDEX           1         396                 46             108                
4096      188416              
> Database size: 21620 KB
> Iteration: 13
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         3                   815            0                  
4096      3338240             
> SQL111029003533400  1         2445                27             1535               
4096      110592              
> LOC_INDEX           1         318                 124            107                
4096      507904              
> Database size: 21314 KB
> Iteration: 14
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         7                   811            0                  
4096      3321856             
> SQL111029003533400  1         2672                51             1718               
4096      208896              
> LOC_INDEX           1         410                 32             100                
4096      131072              
> Database size: 23232 KB
> Iteration: 15
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         2794                156            1842               
4096      638976              
> LOC_INDEX           1         1                   441            1                  
4096      1806336             
> Database size: 20235 KB
> Iteration: 16
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         2933                139            1863               
4096      569344              
> LOC_INDEX           1         3                   439            2                  
4096      1798144             
> Database size: 35124 KB
> Iteration: 17
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         5                   813            0                  
4096      3330048             
> SQL111029003533400  1         3177                34             2002               
4096      139264              
> LOC_INDEX           1         385                 57             15                 
4096      233472              
> Database size: 25820 KB
> Iteration: 18
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         3254                202            2102               
4096      827392              
> LOC_INDEX           1         3                   439            2                  
4096      1798144             
> Database size: 22220 KB
> Iteration: 19
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         2                   816            0                  
4096      3342336             
> SQL111029003533400  1         3509                23             2339               
4096      94208               
> LOC_INDEX           1         397                 45             146                
4096      184320              
> Database size: 35770 KB
> Iteration: 20
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         2                   816            0                  
4096      3342336             
> SQL111029003533400  1         3765                22             2555               
4096      90112               
> LOC_INDEX           1         354                 88             110                
4096      360448              
> Database size: 28916 KB
> Iteration: 21
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         3816                227            2608               
4096      929792              
> LOC_INDEX           1         3                   439            2                  
4096      1798144             
> Database size: 30791 KB
> Iteration: 22
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         4076                18             2694               
4096      73728               
> LOC_INDEX           1         352                 90             23                 
4096      368640              
> Database size: 24658 KB
> Iteration: 23
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         8                   810            0                  
4096      3317760             
> SQL111029003533400  1         4292                62             2882               
4096      253952              
> LOC_INDEX           1         415                 27             62                 
4096      110592              
> Database size: 30294 KB
> Iteration: 24
> ConglomerateName    IsIndex   NumAllocatedPages   NumFreePages   NumUnFilledPages   
PageSize  EstimSpaceSaving    
> LOCATION            0         1                   817            0                  
4096      3346432             
> SQL111029003533400  1         4340                230            2932               
4096      942080              
> LOC_INDEX           1         1                   444            1                  
4096      1818624             
> Database size: 30585 KB
> ------------------ Java Information ------------------
> Java Version:    1.6.0_21
> Java Vendor:     Sun Microsystems Inc.
> Java home:       c:\development\
> Java classpath:  .;derby-10.8.1.2.jar
> OS name:         Windows 7
> OS architecture: x86
> OS version:      6.1
> Java user name:  testuser
> Java user home:  C:\Users\testuser
> Java user dir:   C:\temp\Derby
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.6
> java.runtime.version: 1.6.0_21-b06
> --------- Derby Information --------
> JRE - JDBC: Java SE 6 - JDBC 4.0
> [C:\temp\Derby\derby-10.8.1.2.jar] 10.8.1.2 - (1095077)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> ------------------------------------------------------

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