"path direct reading temp '-P1
Hello!One of my active sessions waiting 'the direct path read temp' event.
Average P1 number settings file and at the same time why this grater number as:
select max(file#) from v$ datafile;I'm usung 10.2.0.5
Thank you and best regards,
Pavel
The file referenced in the direct path read temp"wait event is a temporary file.
EEG, the number of file to a temporary file, you need to subtract the number P1 file db max.
You can get the maximum number of db files with
{code}
Select the value of the parameter $ v where name = 'db_files '.
{code}
After getting the file number of the temporary file, you must look at v$ tempfile for further details.
Lordane Iotzov
http://iiotzov.WordPress.com/
Tags: Database
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Hello
Could someone please clear my doubts about 'db file sequential read' and ' path direct reading. And help me understand the tkprof report correctly.
Please suggest if my understanding for scenario below is correct.
We have a 11.2.0.1 ' cluster 2 node rac version + asm' production and environment of his test environment that is a stand-alone database.
The query performs well in production compared to the test database.
The table is to have 254 + columns (264) with many lobs coulumns however LOB is not currently selected in the query.
I read in metalink this 254 table + column a intra-line-chaining, causing "db file sequential read" full table Scan.
Here are some details on the table which is similar to the prod and test, block size is 8 k:
What I understand less tkprof in production environment for a given session is:TABLE UNUSED BLOCKS TOTAL BLOCKS HIGH WATER MARK ------------------------------ --------------- --------------- --------------- PROBSUMMARYM1 0 17408 17407
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2 19378 disc bed, 2425 reads disc has given rise to the wait event 'db file sequential read'.
This statement is correct this disc remaining readings were "db file sequential reads" but real quick so didn't wait event tied to it?
3 - 183 'direct path read' there also. Is it because of the order by clause of the query?
The same query when ran in no no rac - asm test stand alone database has given below tkprof.SQL ID: 72tvt5h4402c9 Plan Hash: 1127048874 select "NUMBER" num from smprd.probsummarym1 where flag ='f' and affected_item = 'PAUSRWVP39486' order by num asc call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 1 0.00 0.00 0 0 0 0 Fetch 1 0.53 4.88 19378 145164 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 3 0.53 4.88 19378 145164 0 0 Misses in library cache during parse: 0 Optimizer mode: ALL_ROWS Parsing user id: SYS Rows Row Source Operation ------- --------------------------------------------------- 0 SORT ORDER BY (cr=145164 pr=19378 pw=0 time=0 us cost=4411 size=24 card=2) 0 TABLE ACCESS FULL PROBSUMMARYM1 (cr=145164 pr=19378 pw=0 time=0 us cost=4410 size=24 card=2) 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 ges message buffer allocation 3 0.00 0.00 enq: KO - fast object checkpoint 2 0.00 0.00 reliable message 1 0.00 0.00 KJC: Wait for msg sends to complete 1 0.00 0.00 Disk file operations I/O 1 0.00 0.00 kfk: async disk IO 274 0.00 0.00 direct path read 183 0.01 0.72 db file sequential read 2425 0.05 3.71 SQL*Net message from client 1 2.45 2.45
Does this mean that:
1-here too, reads happen through "db file sequential read", but they were so fast that has failed to the wait event?
2. "direct path read," it's because of the order clause in the query. "
For trace files in the database Production and Test, I see that 'direct path read' is against the same data file that's stored table.SQL ID: 72tvt5h4402c9 Plan Hash: 1127048874 select "NUMBER" num from smprd.probsummarym1 where flag ='f' and affected_item = 'PAUSRWVP39486' order by num asc call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 1 0.00 0.06 0 0 0 0 Fetch 1 0.10 0.11 17154 17298 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 3 0.10 0.18 17154 17298 0 0 Misses in library cache during parse: 0 Optimizer mode: ALL_ROWS Parsing user id: SYS Rows Row Source Operation ------- --------------------------------------------------- 0 SORT ORDER BY (cr=17298 pr=17154 pw=0 time=0 us cost=4694 size=12 card=1) 0 TABLE ACCESS FULL PROBSUMMARYM1 (cr=17298 pr=17154 pw=0 time=0 us cost=4693 size=12 card=1) 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 Disk file operations I/O 1 0.00 0.00 db file sequential read 3 0.00 0.00 direct path read 149 0.00 0.03 SQL*Net message from client 1 2.29 2.29
Then how come 'this direct path read' because of the order by clause of the query and would have been in sort field size or pga?
Or this direct path read extracts real PGA disk data, and "db file sequential read" do not extract data?
I know, it's 'direct path read' is wait event when data are asked in PGA drive or what kind segment or temp tablespace is used.
Here is the example of trace file in the Production database:
Here are the trace file for the test database:*** 2013-01-04 13:49:15.109 WAIT #1: nam='SQL*Net message from client' ela= 11258483 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1357278555109496 CLOSE #1:c=0,e=9,dep=0,type=1,tim=1357278555109622 ===================== PARSING IN CURSOR #1 len=113 dep=0 uid=0 oct=3 lid=0 tim=1357278555109766 hv=138414473 ad='cfc02ab8' sqlid='72tvt5h4402c9' select "NUMBER" num from smprd.probsummarym1 where flag ='f' and affected_item = 'PAUSRWVP39486' order by num asc END OF STMT PARSE #1:c=0,e=98,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1127048874,tim=1357278555109765 EXEC #1:c=0,e=135,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1127048874,tim=1357278555109994 WAIT #1: nam='SQL*Net message to client' ela= 2 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1357278555110053 WAIT #1: nam='ges message buffer allocation' ela= 3 pool=0 request=1 allocated=0 obj#=-1 tim=1357278555111630 WAIT #1: nam='enq: KO - fast object checkpoint' ela= 370 name|mode=1263468550 2=65610 0=1 obj#=-1 tim=1357278555112098 WAIT #1: nam='reliable message' ela= 1509 channel context=3691837552 channel handle=3724365720 broadcast message=3692890960 obj#=-1 tim=1357278555113975 WAIT #1: nam='ges message buffer allocation' ela= 2 pool=0 request=1 allocated=0 obj#=-1 tim=1357278555114051 WAIT #1: nam='enq: KO - fast object checkpoint' ela= 364 name|mode=1263468550 2=65610 0=1 obj#=-1 tim=1357278555114464 WAIT #1: nam='KJC: Wait for msg sends to complete' ela= 9 msg=3686348728 dest|rcvr=65536 mtype=8 obj#=-1 tim=1357278555114516 WAIT #1: nam='ges message buffer allocation' ela= 2 pool=0 request=1 allocated=0 obj#=-1 tim=1357278555114680 WAIT #1: nam='Disk file operations I/O' ela= 562 FileOperation=2 fileno=6 filetype=2 obj#=85520 tim=1357278555115710 WAIT #1: nam='kfk: async disk IO' ela= 5 count=1 intr=0 timeout=4294967295 obj#=85520 tim=1357278555117332 *** 2013-01-04 13:49:15.123 WAIT #1: nam='direct path read' ela= 6243 file number=6 first dba=11051 block cnt=5 obj#=85520 tim=1357278555123628 WAIT #1: nam='db file sequential read' ela= 195 file#=6 block#=156863 blocks=1 obj#=85520 tim=1357278555123968 WAIT #1: nam='db file sequential read' ela= 149 file#=6 block#=156804 blocks=1 obj#=85520 tim=1357278555124216 WAIT #1: nam='db file sequential read' ela= 155 file#=6 block#=156816 blocks=1 obj#=85520 tim=1357278555124430 WAIT #1: nam='db file sequential read' ela= 4826 file#=6 block#=156816 blocks=1 obj#=85520 tim=1357278555129317 WAIT #1: nam='db file sequential read' ela= 987 file#=6 block#=156888 blocks=1 obj#=85520 tim=1357278555130427 WAIT #1: nam='db file sequential read' ela= 3891 file#=6 block#=156888 blocks=1 obj#=85520 tim=1357278555134394 WAIT #1: nam='db file sequential read' ela= 155 file#=6 block#=156912 blocks=1 obj#=85520 tim=1357278555134645 WAIT #1: nam='db file sequential read' ela= 145 file#=6 block#=156920 blocks=1 obj#=85520 tim=1357278555134866 WAIT #1: nam='db file sequential read' ela= 234 file#=6 block#=156898 blocks=1 obj#=85520 tim=1357278555135332 WAIT #1: nam='db file sequential read' ela= 204 file#=6 block#=156907 blocks=1 obj#=85520 tim=1357278555135666 WAIT #1: nam='kfk: async disk IO' ela= 4 count=1 intr=0 timeout=4294967295 obj#=85520 tim=1357278555135850 WAIT #1: nam='direct path read' ela= 6894 file number=6 first dba=72073 block cnt=15 obj#=85520 tim=1357278555142774 WAIT #1: nam='db file sequential read' ela= 4642 file#=6 block#=156840 blocks=1 obj#=85520 tim=1357278555147574 WAIT #1: nam='db file sequential read' ela= 162 file#=6 block#=156853 blocks=1 obj#=85520 tim=1357278555147859 WAIT #1: nam='db file sequential read' ela= 6469 file#=6 block#=156806 blocks=1 obj#=85520 tim=1357278555154407 WAIT #1: nam='db file sequential read' ela= 182 file#=6 block#=156826 blocks=1 obj#=85520 tim=1357278555154660 WAIT #1: nam='db file sequential read' ela= 147 file#=6 block#=156830 blocks=1 obj#=85520 tim=1357278555154873 WAIT #1: nam='db file sequential read' ela= 145 file#=6 block#=156878 blocks=1 obj#=85520 tim=135727855515
Thanks & Rgds,*** 2013-01-04 13:46:11.354 WAIT #1: nam='SQL*Net message from client' ela= 10384792 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1357278371354075 CLOSE #1:c=0,e=3,dep=0,type=3,tim=1357278371354152 ===================== PARSING IN CURSOR #1 len=113 dep=0 uid=0 oct=3 lid=0 tim=1357278371363427 hv=138414473 ad='c7bd8d00' sqlid='72tvt5h4402c9' select "NUMBER" num from smprd.probsummarym1 where flag ='f' and affected_item = 'PAUSRWVP39486' order by num asc END OF STMT PARSE #1:c=0,e=9251,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1127048874,tim=1357278371363426 EXEC #1:c=0,e=63178,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1127048874,tim=1357278371426691 WAIT #1: nam='SQL*Net message to client' ela= 2 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1357278371426766 WAIT #1: nam='Disk file operations I/O' ela= 1133 FileOperation=2 fileno=55 filetype=2 obj#=93574 tim=1357278371428069 WAIT #1: nam='db file sequential read' ela= 51 file#=55 block#=460234 blocks=1 obj#=93574 tim=1357278371428158 WAIT #1: nam='direct path read' ela= 31 file number=55 first dba=460235 block cnt=5 obj#=93574 tim=1357278371428956 WAIT #1: nam='direct path read' ela= 47 file number=55 first dba=136288 block cnt=8 obj#=93574 tim=1357278371429099 WAIT #1: nam='direct path read' ela= 80 file number=55 first dba=136297 block cnt=15 obj#=93574 tim=1357278371438529 WAIT #1: nam='direct path read' ela= 62 file number=55 first dba=136849 block cnt=15 obj#=93574 tim=1357278371438653 WAIT #1: nam='direct path read' ela= 17 file number=55 first dba=136881 block cnt=7 obj#=93574 tim=1357278371438750 WAIT #1: nam='direct path read' ela= 35 file number=55 first dba=136896 block cnt=8 obj#=93574 tim=1357278371438855 WAIT #1: nam='direct path read' ela= 22 file number=55 first dba=136913 block cnt=7 obj#=93574 tim=1357278371438936 WAIT #1: nam='direct path read' ela= 19 file number=55 first dba=137120 block cnt=8 obj#=93574 tim=1357278371439029 WAIT #1: nam='direct path read' ela= 36 file number=55 first dba=137145 block cnt=7 obj#=93574 tim=1357278371439114 WAIT #1: nam='direct path read' ela= 18 file number=55 first dba=137192 block cnt=8 obj#=93574 tim=1357278371439193 WAIT #1: nam='direct path read' ela= 16 file number=55 first dba=137201 block cnt=7 obj#=93574 tim=1357278371439252 WAIT #1: nam='direct path read' ela= 17 file number=55 first dba=137600 block cnt=8 obj#=93574 tim=1357278371439313 WAIT #1: nam='direct path read' ela= 15 file number=55 first dba=137625 block cnt=7 obj#=93574 tim=1357278371439369 WAIT #1: nam='direct path read' ela= 22 file number=55 first dba=137640 block cnt=8 obj#=93574 tim=1357278371439435 WAIT #1: nam='direct path read' ela= 702 file number=55 first dba=801026 block cnt=126 obj#=93574 tim=1357278371440188 WAIT #1: nam='direct path read' ela= 1511 file number=55 first dba=801154 block cnt=126 obj#=93574 tim=1357278371441763 WAIT #1: nam='direct path read' ela= 263 file number=55 first dba=801282 block cnt=126 obj#=93574 tim=1357278371442547 WAIT #1: nam='direct path read' ela= 259 file number=55 first dba=801410 block cnt=126 obj#=93574 tim=1357278371443315 WAIT #1: nam='direct path read' ela= 294 file number=55 first dba=801538 block cnt=126 obj#=93574 tim=1357278371444099 WAIT #1: nam='direct path read' ela= 247 file number=55 first dba=801666 block cnt=126 obj#=93574 tim=1357278371444843 WAIT #1: nam='direct path read' ela= 266 file number=55 first dba=801794 block cnt=126 obj#=93574 tim=1357278371445619
Vijay911786 wrote:
Direct path readings can be done on the series tablescans in your version of Oracle, but if you have chained rows in the table and then Oracle can read read read the beginning of the line in the path directly, but must make a single block in the cache (the db file sequential read) to get the next part of the line.
It is possible that your production system has a lot of chained rows, while your test system is not. As corroboration (though not convincing) indicator of what you might notice that if you take (reads disc - db file sequential reads) - who might get you close to all the blocks direct read - the numbers are very similar.
I'm not 100% convinced that it's the answer for the difference in behavior, but worth a visit. If you can force and indexed access path in the table, do something like "select / * + index (use {pk}) * / max table (last_column_in_table)" and check the number of "table fetch continued lines" could be close to the number of db file sequential reads you. (There are other options for the counting of the chained rows that could be faster).
Concerning
Jonathan Lewis -
Insert into... How to do it with a big enough request?
Hello
I want to store the result of this query in a table:
insert into dbsnmp.zetup_iostat (seq_ms, seq_ct, lfpw_ms, lfpw_ct, scat_ms, scat_ct, dpr_ms, dpr_ct, dprt_ms, dprt_ct, prevseq_ct, prevscat_ct, prevseq_tm, prevscat_tm, prevsec, prevlfpw_tm, prevlfpw_ct, prevdpr_ct, prevdpr_tm, prevdprt_ct, prevdprt_tm, prevdpw_ct, prevdpw_tm
prevdpwt_ct, prevdpwt_tm) values (seq_ms, seq_ct, lfpw_ms, lfpw_ct, scat_ms, scat_ct, dpr_ms, dpr_ct, dprt_ms, dprt_ct, prevseq_ct, prevscat_ct, prevseq_tm, prevscat_tm, prevsec, prevlfpw_tm, prevlfpw_ct, prevdpr_ct, prevdpr_tm, prevdprt_ct, prevdprt_tm, prevdpw_ct, prevdpw_tm
prevdpwt_ct, prevdpwt_tm)
Select
Round (seqtm/NULLIF(seqct,0), 2) seq_ms.
Round (seqct/NULLIF(Delta,0), 2) seq_ct.
Round (lfpwtm/NULLIF(lfpwct,0), 2) lfpw_ms.
Round (lfpwct/NULLIF(Delta,0), 2) lfpw_ct.
Round (scattm/NULLIF(scatct,0), 2) scat_ms.
Round (scatct/NULLIF(Delta,0), 0) scat_ct,
Round (dprtm/NULLIF(dprct,0), 2) dpr_ms.
Round (dprct/NULLIF(Delta,0), 2) dpr_ct.
Round (dprttm/NULLIF(dprtct,0), 2) dprt_ms.
Round (dprtct/NULLIF(Delta,0), 2) dprt_ct.
prevseq_ct, prevscat_ct, prevseq_tm, prevscat_tm, prevsec, prevlfpw_tm, prevlfpw_ct
prevdpr_ct, prevdpr_tm, prevdprt_ct, prevdprt_tm, prevdpw_ct, prevdpw_tm
prevdpwt_ct, prevdpwt_tm
Of
(select
sum (decode (event, 'db file sequential read', round(time_waited_micro/1000) - & prevseq_tm_var, 0)) seqtm,.
sum (decode (event, "db-reading of scattered files", round(time_waited_micro/1000) - & prevscat_tm_var, 0)) scattm,.
sum (decode (event, 'parallel writing to log file', round(time_waited_micro/1000) - & prevlfpw_tm_var, 0)) lfpwtm,.
sum (decode (event, 'db file sequential read', round(time_waited_micro/1000), 0)) prevseq_tm,.
sum (decode ("db-reading of scattered files", event, round(time_waited_micro/1000), 0)) prevscat_tm,.
sum (decode (event, 'parallel writing to log file', round(time_waited_micro/1000), 0)) prevlfpw_tm,.
sum (decode (event, 'db file sequential read', total_waits - & prevseq_ct_var, 0)) seqct,.
sum (decode (event, "db-reading of scattered files", total_waits - & prevscat_ct_var, 0)) scatct,.
sum (decode (event, 'parallel writing to log file', total_waits - & prevlfpw_ct_var, 0)) lfpwct,.
sum (decode (event, 'db file sequential read', total_waits, 0)) prevseq_ct,.
sum (decode ("db-reading of scattered files", event, total_waits, 0)) prevscat_ct,.
sum (decode (event, 'parallel writing to log file', total_waits, 0)) prevlfpw_ct,.
sum (decode (event, 'direct path read', round(time_waited_micro/1000) - & prevdpr_tm_var, 0)) dprtm,.
sum (decode ('direct path read', event, round(time_waited_micro/1000), 0)) prevdpr_tm,.
sum (decode (event, 'direct path read', total_waits - & prevdpr_ct_var, 0)) dprct,.
sum (decode ('direct path read', event, total_waits, 0)) prevdpr_ct,.
sum (decode (event, 'Write direct path', round(time_waited_micro/1000) - & prevdpw_tm_var, 0)) dpwtm,.
sum (decode (event, 'Write direct path', round(time_waited_micro/1000), 0)) prevdpw_tm,.
sum (decode (event, 'Write direct path', total_waits - & prevdpw_ct_var, 0)) dpwct,.
sum (decode (event, 'Write direct path', total_waits, 0)) prevdpw_ct,.
sum (decode (event, ' path direct writing temp', round(time_waited_micro/1000) - & prevdpwt_tm_var, 0)) dpwttm,.
sum (decode (' path direct writing temp', event, round(time_waited_micro/1000), 0)) prevdpwt_tm,.
sum (decode (event, ' path direct writing temp', total_waits - & prevdpwt_ct_var, 0)) dpwtct,.
sum (decode (' path direct writing temp', event, total_waits, 0)) prevdpwt_ct,.
sum (decode (event, 'the direct path read temp', round(time_waited_micro/1000) - & prevdprt_tm_var, 0)) dprttm,.
sum (decode (event, "the direct path read temp", round(time_waited_micro/1000), 0)) prevdprt_tm,.
sum (decode (event, 'the direct path read temp', total_waits - & prevdprt_ct_var, 0)) dprtct,.
sum (decode (event, "the direct path read temp", total_waits, 0)) prevdprt_ct,.
Delta to_char (sysdate, 'SSSSS') - & prevsec_var,
to_char(sysdate,'SSSSS') prevsec
Of
v$ system_event
where
test of ('db file sequential read',
"scattered files db reading."
"direct way read temp."
"direct path write temp."
"direct path read."
"Write direct way."
"log file parallel write")
) ;
create table iostat_table)
number of seq_ms
number of seq_ct
number of lfpw_ms
number of lfpw_ct
number of scat_ms
number of scat_ct
number of dpr_ms
number of dpr_ct
number of dprt_ms
number of dprt_ct
number of prevseq_ct
number of prevscat_ct
number of prevseq_tm
number of prevscat_tm
number of prevsec
number of prevlfpw_tm
number of prevlfpw_ct
number of prevdpr_ct
number of prevdpr_tm
number of prevdprt_ct
number of prevdprt_tm
number of prevdpw_ct
number of prevdpw_tm
number of prevdpwt_ct
number of prevdpwt_tm
);
I get
ERROR on line 4:
ORA-00933: SQL not correctly completed command.
When you run the query.
How well do things?
Concerning
3
Delete 'values' of the insert bit.
insert into iostat_table...
Select
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Hi all
We use 10.2.0.3 on sparc solaris 10 64 bit OS.
I wondered about two events in my environment that will take a long time. Yes, we do a lot of grouping, sorting and hash joins that temp on spill data.
For the most part, all time will "lead the read temp path. I took route and seen it's just 1 block reading all time (p3) vs other reads like scattered or direct path write 32 blocks read/write.
So, is there a reason why the direct path read temp to read than a single block at the time? Can we define something that can read multiple blocks in an extractiondirect path read temp 241389 4.19 2511.08 direct path write 2 0.00 0.00
Nico wrote:
Thank you Greg for more information.Have you found any workaround to 10.2.0.3
It is not a work around. The changes in the fixed a bug how temp blocks are read for positional kinds. It should all but remove the one-piece temp readings. Much more effective with this fix. I saw about 2 x increase in performance in many cases actual test using this hotfix.
You can try and see if Oracle Support will backport of 10.2.0.3, but I recommend you do 10.2.0.4 anyway due to the considerable number of bug fixes. It won't take long and 10.2.0.5 comes out as well.
--
Kind regards
Greg Rahn
http://structureddata.org -
Is it reasonable to require a Full table Scan (Direct path read) on a large Table
Hello
I have an Oracle 11.2.0.3 on a Sun Solaris 10 sparc with SGA 25 GB machine
One of my made SQL an analysis of indexes on the table to 45 GB where the size of the index is 14FR and the thourghput for the sequential read is 2MBPS.
so now (Index) 14 000 Mo, 14 GB / 2 MB = dry 7000 = 2 hours to scan the index.
Flow of the direct path read is 500 Mbps for an another SQL and reads assimilate them all live.
and because of this flow, a read (FTS) of direct path on the table of 7 GB out in 12-13 seconds. So in my case, it probably takes 100 seconds to scan the entire table. It is a monthly report and does not often.
Should I try to use a trick to force sql to do a full scan and exploit the possibilities of direct reading and is done in a few minutes? Assuming it to do a FTS (direct play)
Of course, it will be tested and verified, but the question is, is this a sensible apprioach? is - anyone has experience by forcing it?
Any suggestions would be helpful... I'll test this on a different machine tomorrow.
Best regards
Maran
82million lines and a grouping of 18million factor? And really 17million from lines to recover? However, your result set after the hash join is 3500 lines, although the optimizer expects 16 lines.
I would say that the statistics are not representative or not in use for this SQL. Certainly, the index does not match query predicates.
The fact that the index is also using the virtual columns only adds to confusion.
Hemant K Collette
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With regard to 'Direct Path read' expected
As we know, the direct path read waits is a new feature of Oracle 11 g. Oracle Documents or other objects, when it's the full table scan, direct path reading took place. But why it happened? I don't know clearly.
Here is the description of the Oracle Document:
http://docs.Oracle.com/CD/E18283_01/server.112/e17110/waitevents003.htm#sthref3849
During operations of Direct Reading of data asynchronously access path in the database files. At some point, the session must ensure that all the asynchronous i/o in circulation have been realized on the drive. This can also happen if during a direct reading without more slots is available for storing exceptional load requests (a charge application might consist of several e/s).
Question:
1 during operations of Direct data asynchronously reading path in database files. > > this statement means what? What of "asynchronous reading '?
2 describe above description for me in details.
3. who can clearly explain "why read direct path wait to happen ' for me?
Thanks in advance.
Lonion
Lonion wrote:
Question:
1. to path operations Direct playback of data asynchronously in the database files. > This statement means what? What of "asynchronous reading '?
2 describe above description for me in details.
3. who can clearly explain "why read direct path wait to happen ' for me?
If you want to get very technical, Frits Hoogland wrote a lot 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
Concerning
Jonathan Lewis
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read the output of a path of analog output current voltage
In DAQmx if you are unsure of the status of a digital output port, you can take a reading on this subject. When I try this on an analog output, I get an error. Is it possible to query the status of the output of an analog output? I realize that I could follow the State with a variable, but a direct reading would be really handy.
Hello, GIS.
There is no way to read the output in the AO modules without wiring physically the signal to a module to HAVE. You are able to use a variable to read the current value of the output, as you mentioned earlier.
Channels AO multifunction boards, however, can be read through tasks of entry by rounting in-house channel to read ao vs aoground.
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The direct readings and parallel reading
What is the difference between the direct and parallel reading?Direct read:
http://docs.Oracle.com/CD/E11882_01/server.112/e25513/waitevents003.htm#sthref3915
http://docs.Oracle.com/CD/E11882_01/server.112/e16638/instance_tune.htm#sthref726Db file parallel read:
http://docs.Oracle.com/CD/E11882_01/server.112/e25513/waitevents003.htm#sthref3901 -
Reverse the direction of the pasted path?
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Choose all keys > right click > keyframe assistant > time-reverse keyframe
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