My SYSAUX tablespace is full - please help

MY SYSAUXTABLESPACEIS FULL
Pleasehelp me

2
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HI!
MARKUS FLECHTNER
PRINCIPAL CONSULTANT
 Trivadis Germany GmbH
 Studied Mathematics a long time ago
 Focus
o Oracle High Availability
o Database Upgrade + Migration
 Teacher: RAC, New Features, Multitenant, PostgreSQL
 Twitter @markusdba
 Blog: markusdba.net|.de
 Co-author of the book "Der Oracle DBA (2016)"

5 AGENDA
 Introduction
 Which components occupy space in SYSAUX?
 How to cleanup the SYSAUX Tablespace?
 How to keep the SYSAUX tablespace small?
 Conclusion & more information

7 INTRODUCTION
 Until Oracle Database 9i there was the SYSTEM tablespace only
o All database components stored their data their
 With Oracle Database 10g Oracle introduced the SYSAUX tablespace
o Data of many database components was moved to SYSAUX
 Oracle says "if SYSAUX is not available, the database will not fail" (but only components
which store data in SYSAUX)

8 SPACE ISSUES WITH SYSAUX
 Since Oracle 10g more and more components store their data in SYSAUX
 It keeps growing
 There is even a dedicated problem type for service requests:

9 SIZE GUIDELINES/ESTIMATIONS FOR THE SYSAUX TABLESPACE
 Source: Oracle Database 19c – Database Administrators Guide (Chapter 13)
Parameter/Recommendation Small Medium Large
Number of CPUs 2 8 32
Number of concurrently active
sessions
10 20 100
Number of user objects, tables
and indexes
500 5.000 50.000
Estimated SYSAUX size at steady
state with default configuration
500 MB 2 GB 5 GB

10
WHICHCOMPONENTSOCCUPYSPACE IN SYSAUX?

11 THE ENTRYPOINT: V$SYSAUX_OCCUPANTS
 Oracle provides a V$ view which provides almost all the information we need:
 Important: Analysis, cleanup and configuration must be done in each container
(CDB$ROOT and PDBs) separately
SQL> desc v$sysaux_occupants
Name Null? Type
----------------------------- ------ --------------------
OCCUPANT_NAME VARCHAR2(64)
OCCUPANT_DESC VARCHAR2(64)
SCHEMA_NAME VARCHAR2(64)
MOVE_PROCEDURE VARCHAR2(64)
MOVE_PROCEDURE_DESC VARCHAR2(64)
SPACE_USAGE_KBYTES NUMBER
CON_ID NUMBER

12 ISSUES WITH V$SYSAUX_OCCUPANTS (1)
 In a Container Database when in CDB$ROOT, V$SYSAUX_OCCUPANTS shows the
current container only (i.e. CDB$ROOT)
o No global view possible
o SR open
 Other issues (public bugs from MOS):
o Bug 16767759 AUDSYS schema is not present in V$SYSAUX_OCCUPANTS
o Open since 12.1.0.1, fixed in 12.2
o Bug 10404641 V$sysaux_occupants.space_usage_kbytes may not be accurate
o Open since 10.2.0.4, fixed in 18.1

13 ISSUES WITH V$SYSAUX_OCCUPANTS (2)
 It seems that V$SYSAUX_OCCUPANTS is not 100% accurate:
SQL> select distinct schema_name
2 from v$sysaux_occupants
3 where SPACE_USAGE_KBYTES>0
4 order by schema_name;
SCHEMA_NAME
--------------------
AUDSYS
CTXSYS
DBSNMP
MDSYS
SYS
SYSTEM
WMSYS
XDB
SQL> select distinct owner from
2 dba_segments where
3 tablespace_name='SYSAUX'
4 order by owner;
OWNER
--------------------
AUDSYS
CTXSYS
DBSNMP
GSMADMIN_INTERNAL
MDSYS
SYS
SYSTEM
WMSYS
XDB
Global Database
Services

14 EXAMPLE OUTPUT: V$SYSAUX_OCCUPANTS
SQL> select OCCUPANT_NAME,OCCUPANT_DESC, SPACE_USAGE_KBYTES USED_KB
2 from V$SYSAUX_OCCUPANTS where SPACE_USAGE_KBYTES>0
3 order by SPACE_USAGE_KBYTES desc
4 fetch first 10 rows only;
OCCUPANT_NAME OCCUPANT_DESC USED_KB
--------------- ------------------------------------------------------- ----------
SM/AWR Server Manageability - Automatic Workload Repository 137024
SDO Oracle Spatial 132096
XDB XDB 104448
AO Analytical Workspace Object Table 49536
AUDSYS AUDSYS schema objects 47680
SM/OPTSTAT Server Manageability - Optimizer Statistics History 39680
SM/OTHER Server Manageability - Other Components 33088
SM/ADVISOR Server Manageability - Advisor Framework 13440
LOGMNR LogMiner 11264
WM Workspace Manager 7488

15 TOP OCCUPANTS – THE USUAL SUSPECTS
 SM/OPTSTAT - old optimizer statistics
 SM/ADVISOR – the various advisors
 SM/AWR – AWR data
 SM/OTHER - DB Feature Usage, Alert History etc.
 SQL_MANAGEMENT_BASE – SQL baselines
 AUDSYS – audit data

16 OCCUPANTS WHICH TYPICALLY DO NOT OCCUPY SPACE
SQL> select occupant_name,occupant_desc from v$sysaux_occupants
2 where space_usage_kbytes=0;
OCCUPANT_NAME OCCUPANT_DESC
------------------------ ----------------------------------------------------------------
AUDIT_TABLES DB audit tables
XSAMD OLAP Catalog
XSOQHIST OLAP API History Tables
STATSPACK Statspack Repository
ORDIM Oracle Multimedia ORDSYS Components
ORDIM/ORDDATA Oracle Multimedia ORDDATA Components
ORDIM/ORDPLUGINS Oracle Multimedia ORDPLUGINS Components
ORDIM/SI_INFORMTN_SCHEMA Oracle Multimedia SI_INFORMTN_SCHEMA Components
EM Enterprise Manager Repository
ULTRASEARCH Oracle Ultra Search
ULTRASEARCH_DEMO_USER Oracle Ultra Search Demo User
EXPRESSION_FILTER Expression Filter System
TSM Oracle Transparent Session Migration User

17 OCCUPANTS WHICH ARE DESUPPORTED (AND CAN BE IGNORED)
 Oracle Streams
o Desupported since Oracle Database 19c
 Enterprise Manager Repository
o Used by OEM Database Control (until Oracle Database 11g Release 2)
o Can be removed in Oracle Database 12c and higher:
Script $ORACLE_HOME/rdbms/admin/emremove.sql

18 DETAILED ANALYSIS OF AWR DATA IN SYSAUX
 The script $ORACLE_HOME/rdbms/admin/awrinfo.sql provides more information about
the AWR components in SYSAUX
o And about the other occupants, too (e.g. largest segments)
[…]
**********************************
(3a) Space usage by AWR components (per database)
**********************************
COMPONENT MB % AWR KB_PER_SNAP MB_PER_DAY MB_PER_WEEK TABLE% : INDEX%
--------- --------- ------ ------------ ---------- ----------- ----------------
FIXED 89.7 69.4 5,402 21.1 147.7 47% : 53%
EVENTS 10.4 8.1 629 2.5 17.2 39% : 61%
SPACE 9.3 7.2 561 2.2 15.3 50% : 50%
SQLPLAN 7.8 6.0 467 1.8 12.8 66% : 34%
SQL 4.8 3.7 286 1.1 7.8 50% : 50%
ASH 2.4 1.9 147 0.6 4.0 69% : 31%
RAC 1.6 1.3 98 0.4 2.7 50% : 50%
SQLBIND 1.2 0.9 72 0.3 2.0 47% : 53%
SQLTEXT 1.2 0.9 72 0.3 2.0 68% : 32%
[…]

19 SIZE ESTIMATION FOR THE SYSAUX TABLESPACE - UTLSYXSZ.SQL
 The script $ORACLE_HOME/rdbms/admin/utlsyxsz.sql can help to estimate the required
size of the SYSAUX tablespace
o You have to provide some information like snapshot interval, retention etc.
[…]
| ***************************************************
| Summary of SYSAUX Space Estimation
| ***************************************************
| Est size of SDO 297.1 MB
| Est size of XDB 66.1 MB
| Est size of SM/ADVISOR 63.8 MB
| Est size of AUDSYS 53.2 MB
| Est size of SM/OTHER 50.0 MB
| Est size of AO 45.8 MB
| Est size of LOGMNR 10.8 MB
| Est size of WM 6.6 MB
[…]
| Est size of Others 201.4 MB
| Est size of SM/AWR 708.7 MB
| Est size of SM/OPTSTAT 37.0 MB
|
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Total Estimated SYSAUX size: 1,558.6 MB
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| *************************************************** […]

20
HOW TOCLEANUPTHE SYSAUXTABLESPACE?

21 HOW TO REDUCE THE SIZE OF THE SYSAUX TABLESPACE
 Option 1:
o Reorganize tables and indexes in SYSAUX
 Option 2:
o Move the component out of the SYSAUX Tablespace
 Option 3 (AWR-related data)
o Cleanup data used by the occupant
o Define appropriate retention parameters
 And
o … don't forget to resize the datafiles afterwards
o ... with AUTOEXTENSIBLE datafiles you may not detect
a fastly growing SYSAUX tablespace

22 REORGANIZE TABLES AND INDEXES IN SYSAUX
 As we know it:
o Don't forget to rebuild indexes after moving a table
o $ORACLE_HOME/rdbms/admin/awrinfo.sql will show the largest segments
 Do not reorganize XDB objects!
 More information:
o How to Reduce SYSAUX Tablespace Occupancy Due to Fragmented
TABLEs and INDEXes (Doc ID 1563921.1)
o Reducing SYSAUX Fragmentation of TABLEs and INDEXes Caused
by Statistics Related Activities (Doc ID 1271178.1)
ALTER TABLE .. MOVE TABLESPACE SYSAUX ONLINE;
ALTER INDEX .. REBUILD TABLESPACE SYSAUX ONLINE;

23 MOVE DATA OUT OF THE SYSAUX TABLESPACE
 Oracle provides procedures for moving the data into another tablespace
SQL> select occupant_name,move_procedure from v$sysaux_occupants
2 where move_procedure is not null;
OCCUPANT_NAME MOVE_PROCEDURE
------------------------ ---------------------------------------------
LOGMNR SYS.DBMS_LOGMNR_D.SET_TABLESPACE
LOGSTDBY SYS.DBMS_LOGSTDBY.SET_TABLESPACE
AUDSYS DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION
AUDIT_TABLES DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION
XDB XDB.DBMS_XDB_ADMIN.MOVEXDB_TABLESPACE
XSAMD DBMS_AMD.Move_OLAP_Catalog
AO DBMS_AW.MOVE_AWMETA
XSOQHIST DBMS_XSOQ.OlapiMoveProc
SDO MDSYS.MOVE_SDO
WM DBMS_WM.move_proc
ORDIM ordsys.ord_admin.move_ordim_tblspc
ORDIM/ORDDATA ordsys.ord_admin.move_ordim_tblspc
ORDIM/ORDPLUGINS ordsys.ord_admin.move_ordim_tblspc
ORDIM/SI_INFORMTN_SCHEMA ordsys.ord_admin.move_ordim_tblspc
EM emd_maintenance.move_em_tblspc
TEXT DRI_MOVE_CTXSYS
ULTRASEARCH MOVE_WK
ULTRASEARCH_DEMO_USER MOVE_WK

24 MOVE PROCEDURE – EXAMPLE: AUDIT-DATA (1)
 Procedure DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION
 Values for AUDIT_TRAIL_TYPE
o AUDIT_TRAIL_AUD_STD (Tables AUD$ and FGA_LOG$)
o AUDIT_TRAIL_FGA_STD (FGA_LOG$)
o AUDIT_TRAIL_DB_STD (AUD$)
o AUDIT_TRAIL_UNIFIED (unified audit data)
PROCEDURE SET_AUDIT_TRAIL_LOCATION
Argument Name Type In/Out Default?
------------------------------ ----------------------- ------ --------
AUDIT_TRAIL_TYPE BINARY_INTEGER IN
AUDIT_TRAIL_LOCATION_VALUE VARCHAR2 IN

25 MOVE PROCEDURE – EXAMPLE: AUDIT-DATA (2)
 Move data
 Can be time-consuming
 Preferably during non-peak hours
 For type AUDIT_TRAIL_UNIFIED new partitions of the
audit table will be created in the new tablespace.
Existing data will not be moved.
SQL> exec DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION
2 (AUDIT_TRAIL_TYPE=>'AUDIT_TRAIL_DB_STD',
AUDIT_TRAIL_LOCATION_VALUE=>'AUDIT_DATA');  new tablespace

26 REDUCE DATA IN SYSAUX – SM/OPTSTAT
 Remove old statistics
 Example: remove data older than 14 days (Default retention period is 31 days)
exec DBMS_STATS.PURGE_STATS(SYSDATE-15);

27 REDUCE DATA IN SYSAUX – SM/ADVISOR (1)
 "Deleting data from this component can be more complicated." (Quote from MOS-Note
329984.1)
 Use OEM to delete old results
 You can DISABLE and RE-ENABLE an advisor
o You will loose all the old data
(but that's on purpose in this case)

28 REDUCE DATA IN SYSAUX – SM/ADVISOR (2) – STATISTICS ADVISOR
 By default, old data will be purged automatically after 30 days
 Change this setting (EXECUTION_DAYS_TO_EXPIRE):
 Manual purging:
o Move table WRI$_ADV_OBJECTS and rebuild indexes
 Note: According to MOS-Note 2660128.1 data in PDBs
will not be purged automatically
o  Use manual purging
SQL> EXEC DBMS_ADVISOR.SET_TASK_PARAMETER
(task_name=> 'AUTO_STATS_ADVISOR_TASK',
parameter=> 'EXECUTION_DAYS_TO_EXPIRE', value => 10);
SQL> exec prvt_advisor.delete_expired_tasks;

29 REDUCE DATA IN SYSAUX – SM/AWR (1)
 Reduce the retention period  Older data will be deleted
 Current retention period (example: 31 days):
 Change retention period (example: back to the default of 8 days)
SQL> SELECT retention FROM dba_hist_wr_control;
RETENTION
---------------------------------------------------------------------------
+00031 00:00:00.0
SQL> exec DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS
(retention=>8*1440);

30 REDUCE DATA IN SYSAUX – SM/AWR (2)
 Remove a range of AWR snapshots
DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(
low_snap_id IN NUMBER,
high_snap_id IN NUMBER
dbid IN NUMBER DEFAULT NULL);

31 REDUCE DATA IN SYSAUX – SM/SQL_MANAGEMENT_BASE (1)
 Options
o Reduce retention period
o Reduce available space in SYSAUX
o Remove unused SQL Plan baselines
o Restrict the plans which will be gathered

 Reduce retention period & reduce available space in SYSAUX
 Current configuration
 Change configuration
SQL> SELECT PARAMETER_NAME, PARAMETER_VALUE from DBA_SQL_MANAGEMENT_CONFIG;
PARAMETER_NAME PARAMETER_VALUE
---------------------------------------- ------------------------------
[..]
PLAN_RETENTION_WEEKS 53
SPACE_BUDGET_PERCENT 10
SQL> Exec DBMS_SPM.CONFIGURE('PLAN_RETENTION_WEEKS',26);
SQL> Exec DBMS_SPM.Configure('SPACE_BUDGET_PERCENT',5);

 Remove unused SQL Plan baselines
 Step 1: Find out the sql_handle
 Step 2: Remove SQL Plan baseline for this handle
 More information: SQL Tuning Guide, Chapter 28.6
SQL> SELECT SQL_HANDLE, SQL_TEXT, PLAN_NAME, ORIGIN, ENABLED, ACCEPTED
2 FROM DBA_SQL_PLAN_BASELINES
3 WHERE SQL_TEXT LIKE '<your_sql_text>';
DECLARE
v_dropped_plans number;
BEGIN
v_dropped_plans := DBMS_SPM.DROP_SQL_PLAN_BASELINE (
sql_handle => '<handle_from_step_1>'
);
DBMS_OUTPUT.PUT_LINE('dropped ' || v_dropped_plans || ' plans');
END;
/

 Through 12.1 a SQL plan baselines is created for every SQL statement that is executed
repeatedly
 Since 12.2 several include/exclude filter types for automatic capture are available
o SQL text
o Parsing schema name
o Module (DBMS_APPLICATION_INFO)
o Action (DBMS_APPLICATION_INFO)
 For example: include only SQL statements whose text start with “SELECT”
dbms_spm.configure(parameter_name=>'AUTO_CAPTURE_SQL_TEXT',
parameter_value=>'SELECT%',
allow => TRUE);

35 REDUCE DATA IN SYSAUX – SM/OTHER (5)
 Unfortunately, there's no special advice if there are space issues with SM/OTHER
 Create an SR and follow the steps described in the MOS Note
"SRDC - How to Collect Standard Information for an Issue where Excessive SYSAUX
Space is Used by the Automatic Workload Repository (AWR) (Doc ID 1934108.1)"

36 CHECK THE STATISTICS LEVEL
 Level "ALL" may lead to a huge amount of data in SYSAUX
 Recommendation:
o Keep the default value "TYPICAL"
SQL> show parameter STATISTICS_LEVEL
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
statistics_level string TYPICAL

37
HOW TOKEEPTHE SYSAUXTABLESPACESMALL?

38 A STITCH IN TIME SAVES NINE
 Soon after creating a database:
o Use dedicated tablespaces
o Move Audit-Data out of the SYSAUX tablespace
o Use a dedicated tablespace for Statspack data (schema PERFSTAT)
o Don't use AUTOEXTENSIBLE for SYSAUX (or set it to a reasonable value)
o But don't forget to monitor your tablespaces 
o Keep Statistics Level "Typical"
o Define appropriate retention periods for AWR related data
o Disable unnecessary advisors
Vorbeugen ist besser als heilen

39 DEFINE RETENTION POLICIES (1)
REM SM/OPTSTAT
REM retention period in days (Default: 31 days)
exec dbms_stats.alter_stats_history_retention(7);
REM SM/ADVISOR
REM retention period Statistics Advisor (default: 30 days)
EXEC DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER (
task_name => 'AUTO_STATS_ADVISOR_TASK',
parameter => 'EXECUTION_DAYS_TO_EXPIRE',
value => 14);

40 DEFINE RETENTION POLICIES (2)
REM SM/AWR
REM retention period defined in minutes (1 day = 1440 minutes)
exec DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(retention=>8*1440);
REM SQL_MANAGEMENT_BASE
REM retention period defined in weeks
Exec DBMS_SPM.CONFIGURE('PLAN_RETENTION_WEEKS',26);
REM or percentage of space in SYSAUX
Exec DBMS_SPM.Configure('SPACE_BUDGET_PERCENT',5);

41 DISABLE UN-NEEDED ADVISORS (EXAMPLES)
REM disable the Statistic Advisor
exec dbms_stats.set_global_prefs('AUTO_STATS_ADVISOR_TASK','FALSE');
REM disable the Tuning Advisor
DBMS_AUTO_TASK_ADMIN.DISABLE(
client_name => 'sql tuning advisor',
operation => NULL, window_name => NULL);
REM disable the Space Advisor
DBMS_AUTO_TASK_ADMIN.DISABLE(
client_name => 'sql space advisor',
operation => NULL, window_name => NULL);

42
CONCLUSION&
MORE INFORMATION

43 CONCLUSION
 More and more components are using the SYSAUX tablespace
 SYSAUX needs your attention
o To detect massive growth
 Use dedicated tablespaces where applicable
 Set retention policies soon after database creation

44 MORE INFORMATION – MOS-NOTES (1)
 Troubleshooting Issues with SYSAUX Space Usage (Doc ID 1399365.1)
 General Guidelines for SYSAUX Space Issues (Doc ID 552880.1)
 How to Reduce SYSAUX Tablespace Occupancy Due to Fragmented TABLEs and INDEXes (Doc ID
1563921.1)
 Tips if Your SYSAUX Tablespace Grows Rapidly or Too Large (Doc ID 1292724.1)
 Usage and Storage Management of SYSAUX tablespace occupants SM/AWR, SM/ADVISOR,
SM/OPTSTAT and SM/OTHER (Doc ID 329984.1)
 SRDC - How to Collect Standard Information for an Issue where Excessive SYSAUX Space is Used by the
Automatic Workload Repository (AWR) (Doc ID 1934108.1)
 SYSAUX Tablespace Filled With WRI$_EMX_FILES | What is WRI$EMX_FILES (Doc ID 2639664.1)
 SYSAUX Tablespace Grows Quite Fast Due to Apply Spilling (Doc ID 556183.1)
 SYSAUX Tablespace Growing Due to SYS.SCHEDULER$_JOB_OUTPUT LOB Column (Doc ID 2095104.1)

45 MORE INFORMATION – MOS-NOTES (2)
 Bug 8553944 - SYSAUX tablespace grows (Doc ID 8553944.8)
 How To Recreate the SYSAUX Tablespace (Doc ID 468116.1)
 SYSAUX Tablespace Space Issue Because Of dbms_comparison (Doc ID 2089484.1)
 Exports Fail Because SYSAUX Tablespace Needs Recovery (Doc ID 1497195.1)
 Bug 14373728 - Old Statistics not Purged from SYSAUX Tablespace (Doc ID 14373728.8)
 HEATMAP Segment Size Is Large In SYSAUX Even When Heatmap=Off (Doc ID 2024036.1)
 SYSAUX New Mandatory Tablespace in Oracle 10g and higher (Doc ID 243246.1)
 ZDLRA: SM/ADVISOR using more space in SYSAUX (Doc ID 2730556.1)
 How to Relocate the SYSAUX Tablespace (Doc ID 301186.1)
 SYSAUX Tablespace Is Getting Filled Frequently with COMPARISON_ROW_DIF$ (Doc ID 2087865.1)
 Abnormal High Space Usage in Sysaux Tablespace - Unable to Purge (Doc ID 1360000.1)
 Large Growth of SYSAUX Tablespace with Table WRH$_SQL_PLAN Taking Lot of Space (Doc ID
2475149.1)

46 MORE INFORMATION: BLOG POSTS
 Hermann & Lenz: Neues vom SYSAUX-Tablespace…: (in German)
https://blog.hl-services.de/2021/03/26/neues-vom-sysaux-tablespace/
 ToadWorld: SYSAUX and purging big objects (segments) manually:
https://blog.toadworld.com/2017/11/15/sysaux-and-purging-big-objects-segments-manually
 Andrea Held: Der Oracle Sysaux-Tablespace: Reorganisation und Verkleinerung (in German)
https://www.informatik-aktuell.de/betrieb/datenbanken/der-oracle-sysaux-tablespace-reorganisation-
und-verkleinerung.html
 Oracle Help: Tablespace SYSAUX ist voll oder wächst ununterbrochen: (in German)
https://oracletipps.wordpress.com/2015/10/21/tablespace-sysaux-full-or-growing/
 Cleaning Oracle SYSAUX Tablespace Usage:
https://www.techpaste.com/2017/03/cleaning-oracle-sysaux-tablespace-usage/
 Mein SYSAUX-Tablespace wächst und wächst, was soll (kann) ich tun ..: (in German)
https://www.markusdba.de/2021/04/06/mein-sysaux-tablespace-waechst-und-waechst-was-soll-kann-
ich-tun/

QUESTIONS & ANSWERS
MARKUS FLECHTNER
 Markus.flechtner@trivadis.com
 Twitter @markusdba
 Blog: markusdba.net

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My SYSAUX tablespace is full - please help

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