Direct read PLPOD in SQ01

LTXA2 Field in Table PLPOD (i.e.Routing)
i'm not sure how the thread above was able to query PLPOD? i receive a direct read not possible message in SQ01. there are some major discrepancies in MRP because routing from CA03 is not consistent with MRP1 making plant settings. what other info sets or logical databases should i consider to find the base quantities (PLPOD-BMSCH)?
also, when faced with something that can not be directly read from SQ01, what route(s) can you take to research an area that can be read? SE11 ?

plpo, coffee break

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Tony,
Thanks & Appreciate your Quick response.
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Force direct read instead of memory

hi,
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elcaro wrote:
thanks a lot Alexander, perfect answer for me.Good.
Keep in mind that only full scans (table, index, matview) can work in direct-path read.
Also if you test queries which will work in usual (cached) mode you maybe just need to flush buffer cache before you tests, instead of direct reads
alter system flush buffer_cache;obviously for test environments only

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Mainly, Direct Read refers to accesses in which a maximum of one line is returned by the database, otherwise Sequential Read refers to all other read database accesses, in which there may be more than one line returned.
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Hey all,
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Termination occurred in the ABAP program "SAPLSNR3" - in "READ_NRIV".
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Hi Chris,
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Hi everyone,
I am experiencing High Direct path reads and every time i run the query I see there is no decrease in physical reads.
I have come across in the docs that this could be if the blocks are directly read into PGA instead of SGA, what will be the cases for this to be true and how can i overcome the disk reads.
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user8710159 wrote:
Hi everyone,
I am experiencing High Direct path reads and every time i run the query I see there is no decrease in physical reads.
I have come across in the docs that this could be if the blocks are directly read into PGA instead of SGA, what will be the cases for this to be true and how can i overcome the disk reads.
Please advice.
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http://docs.oracle.com/cd/E18283_01/server.112/e17110/waitevents003.htm#sthref3849
During Direct Path operations the data is asynchronously read from the database files. At some stage the session needs to make sure that all outstanding asynchronous I/O have been completed to disk. This can also happen if during a direct read no more slots are available to store outstanding load requests (a load request could consist of multiple I/Os).
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Thanks in advance.
Lonion

Lonion wrote:
Question:
1. During Direct Path operations the data is asynchronously read from the database files. >> what does this statement mean? what's ''asynchronously read'?
2. describe above description for me in details.
3. who can clearly explain 'why direct path read waits occur' for me?
If you want to get very technical, Frits Hoogland has written lots of stuff about the implementation:
http://fritshoogland.wordpress.com/2013/05/09/direct-path-read-and-fast-full-index-scans/
http://fritshoogland.wordpress.com/2013/01/04/oracle-11-2-and-the-direct-path-read-event/
http://fritshoogland.wordpress.com/2012/12/27/oracle-11-2-0-1-and-the-kfk-async-disk-io-wait-event/
http://www.ukoug.org/what-we-offer/library/about-multiblock-reads/about-multiblock-reads.pdf
Regards
Jonathan Lewis

Select count(*) from table in oracle 11g with direct path read takes time

select count(*) from table takes long time, even more than couple of hours..
direct path read is the wait event which is almost is at 99%..
can u someone provide some info on this.. on solution.. thankx

knowledgespring wrote:
table has millions of records... 130 millions..
select count(*) from BIG_SIZE_TABLE; --- executed in sql plus command prompt.
Rows     Execution Plan
0 SELECT STATEMENT   MODE: ALL_ROWS
0   SORT (AGGREGATE)
0    TABLE ACCESS   MODE: ANALYZED (FULL) OF 'BIG_SIZE_TABLE' (TABLE)
Elapsed times include waiting on following events:
Event waited on                             Times   Max. Wait Total Waited
----------------------------------------   Waited ---------- ------------
SQL*Net message to client                       1        0.00          0.00
enq: KO - fast object checkpoint                1        0.01          0.01
Disk file operations I/O                       18        0.00          0.00
direct path read                            58921        0.34        418.54direct path read time waited is : 58921 total time waited: 418.54
That 418 seconds - not the hours you reported earlier. Is it possible that your connection to the database broke ?
On a typical system, by the way, you can usually turn one direct read for tablescan into 1MB, so your scan seems to have covered about 59 GB, which seems to be in the right sort of ballpark for 130M rows.
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Regards
Jonathan Lewis

Direct Path Reads instead of Sequential Reads for index range scan

Database is 11.2. I have two development schemas, with the same table loaded in each schema - a 5 million row table. The execution path for the sql statement is the same against both tables; it's doing an index range scan.
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There is not enough information.So you even these tables located same database and you gathered statistics it is not mean both run time wait event statistics must be same.Really they are different tables.If both query use INDEX RANGE SCAN the it is not mean these plans are same.What about table and their index statistics? are they same? for example num_row or num_blocks of both tables are same? also about indexes.In additionally if you want to get exact reason you can enable sql trace(using dbms_monitor or setting sql_trace parameter to true according session) and need analyze result trace file using tkprof utility.In additionally in 11g here when query execution time oracle automatically choose direct read path(serial) based on size of tables and size of buffer cache(also here is available some hidden parameter to controlling this behavior).

Direct read PLPOD in SQ01

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