Hello,
We are running SAP ECC6, on Oracle 11.2.0.4.0, HP-UX 11.31
Our Production Database (5 TB) consists of some large tables , which size is more than 200 GB ; GLPCA,RESB, ...
We are scheduling the update of the statistics every morning at 06:00 though transaction DB13,
The Oracle Statistics are being processed in parallel :
stats_parallel_degree = 8 , which means that basically up to 8 tables/indexes are being processed at the same time, but
one single thread processes each table. For the sake of simplicity, I call it "external parallelism"
It means that when the statistics of some large tables are obsoletes , and are automatically recalculated, it takes some significant amount of time, more than 15 hours for the DB13 jobs to be processed.
For all those reasons, I am trying to implement the "internal parallelism" , through the dbms_stats package, in order to configure several threads for the largest tables, as explained in details in the following sap note :
424239 - New BRCONNECT parameter: stats_dbms_stats
408532 - Using the DBMS_STATS package for collecting statistics
914174 - Minor functional enhancements in BR*Tools (1)
I spent the two past days , doing some tests on our QAS database (much smaller size), trying to update in parallel the statistics of table GLPCA, through several threads, but it does not work. I am probably missing something, but I can not figure out what
I tried all kinds of combination for the following parameter :
| stats_dbms_stats | ALL:R:1,GLPCA:R:3 |
| stats_dbms_stats | ALL:R:0,GLPCA:R:3 |
| stats_dbms_stats | ALL:R:2,GLPCA:R:3 |
But still, the table GLPCA keeps being processed by one unique thread, and not three threads as expected.
I am joining the DB24 log, maybe someone can help me pinpoint what I am missing :
As you can see, 4 threads are started in parallel because of the parameter
| stats_parallel_degree | 4 |
But one single threads is then assigned to table GLPCA, I was expecting three threads
Thank you for your attention
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Detail log: cepiemwr.sta
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BR0801I BRCONNECT 7.20 (30)
BR0805I Start of BRCONNECT processing: cepiemwr.sta 2014-12-03 14.55.57
BR0484I BRCONNECT log file: /oracle/RUQ/sapcheck/cepiemwr.sta
BR0101I Parameters
Name Value
oracle_sid RUQ
oracle_home /oracle/RUQ/112_64
oracle_profile /oracle/RUQ/112_64/dbs/initRUQ.ora
sapdata_home /oracle/RUQ
sap_profile /oracle/RUQ/112_64/dbs/initRUQ.sap
system_info ruqadm/oraruq server02 HP-UX B.11.31 U ia64
oracle_info RUQ 11.2.0.4.0 8192 1092 21727164 server02 UTF8 UTF8 1599868393 &RUQ
sap_info 700 SAPSR3 RUQ TEMPLICENSE R3_ORA INITIAL
make_info hpia64 OCI_102 Feb 9 2013
command_line brconnect -c -u / -f stats -t GLPCA
stats_table GLPCA
stats_dbms_stats ALL:R:1,GLPCA:R:3
stats_change_threshold 50
stats_parallel_degree 4
BR0280I BRCONNECT time stamp: 2014-12-03 14.55.58
BR0813I Schema owner found in database RUQ: SAPSR3*
BR0280I BRCONNECT time stamp: 2014-12-03 14.55.58
BR0807I Name of database instance: RUQ
BR0808I BRCONNECT action ID: cepiemwr
BR0809I BRCONNECT function ID: sta
BR0810I BRCONNECT function: stats
BR0812I Database objects for processing: GLPCA
BR0851I Number of tables with missing statistics: 1
Owner SAPSR3: 1
GLPCA
BR0852I Number of tables to delete statistics: 0
BR0854I Number of tables to collect statistics without checking: 0
BR0855I Number of indexes with missing statistics: 5
Owner SAPSR3: 5
GLPCA~0 GLPCA~1 GLPCA~2 GLPCA~3 GLPCA~7
BR0856I Number of indexes to delete statistics: 0
BR0857I Number of indexes to collect statistics: 0
BR0853I Number of tables to check (and collect if needed) statistics: 1
Owner SAPSR3: 1
GLPCA
BR0846I Number of threads that will be started in parallel to the main thread: 4
BR0126I Unattended mode active - no operator confirmation required
BR0280I BRCONNECT time stamp: 2014-12-03 14.55.58
BR0817I Number of monitored/modified tables in schema of owner SAPSR3: 1/0
BR0280I BRCONNECT time stamp: 2014-12-03 14.55.59
BR0877I Checking and collecting table and index statistics...
BR0847I Thread 1 started successfully
BR0847I Thread 2 started successfully
BR0280I BRCONNECT time stamp: 2014-12-03 14.56.00
BR0848I Thread 1 finished with return code 0
BR0280I BRCONNECT thread 2 time stamp: 2014-12-03 14.56.02
BR0881I Collecting statistics for table SAPSR3.GLPCA with method/sample E/P3 ...
BR0280I BRCONNECT thread 2 time stamp: 2014-12-03 14.56.20
BR0884I Statistics collected for table: SAPSR3.GLPCA, rows old/new: -1/1702667
BR0280I BRCONNECT thread 2 time stamp: 2014-12-03 14.56.20
BR0850I 2 of 2 objects processed - 0.003 of 0.003 units done
BR0204I Percentage done: 100.00%, estimated end time: 14:56
BR0001I **************************************************
BR0280I BRCONNECT time stamp: 2014-12-03 14.56.21
BR0848I Thread 2 finished with return code 0
BR0280I BRCONNECT time stamp: 2014-12-03 14.56.21
BR0879I Statistics checked for 1 table
BR0878I Number of tables selected to collect statistics after check: 0
BR0880I Statistics collected for 1/1 tables/indexes
BR0894I Tables with the longest duration of collecting statistics for owner SAPSR3
Pos. Owner Table Duration Rows/old Rows/new Meth./Samp. Space[KB] Used[KB:%] Data[KB:%] Lobs Space[KB] Used[KB:%] Data[KB:%]
[m:s]
1 SAPSR3 GLPCA 0:18 -1 1702667 E/P3 -1 896776:100 746580:83 0 0 0:0 0:0
BR0895I Indexes with the longest duration of collecting statistics for owner SAPSR3
Pos. Owner Index Duration Rows/old Rows/new Meth./Samp. Space[KB] Used[KB:%] Data[KB:%]
[m:s]
1 SAPSR3 GLPCA~0 0:03 -1 1681586 E/P1
BR0900I Usage of space allocated in tablespaces for analyzed tables and indexes
Pos. Tablespace Tables Analy. Space[KB] Used[KB:%] Data[KB:%] Indexes Valid. Space[KB] Used[KB:%] Data[KB:%] Lobs Proc. Space[KB] Used[KB:%] Data[KB:%]
1 PSAPSR3 -1 1 -1 896776:100 746580:83 -1 0 0 0:0 0:0 -1 0 0 0:0 0:0
BR0806I End of BRCONNECT processing: cepiemwr.sta 2014-12-03 14.56.21
BR0280I BRCONNECT time stamp: 2014-12-03 14.56.21
BR0802I BRCONNECT completed successfully