Table of Build using Pseudo-file of waiting
I'm moving to use a queue by simply creating a table. I writing to a write DAQmx values in a loop at 50 ms, but I won't update the chart every 50 ms (for obvious reasons). I use a global functional for transmitting data from a slower loop to 500 ms.
Problem is that I get that each point of the tenth. Y at - it an easy way to build an array and pass (without overwrite or skip data) to the slower without having to queue loop?
Thanks for the help.
Why not use a queue? It is by far the most effective way to do what you want.
What you have run in with the FGV is a race condition. They you used it, it might as well be a local variable or a global variable. FGVs do NOT prevent the race conditions in the way that you use it. Here's a good article about the race conditions in the field of LabVIEW log:http://labviewjournal.com/2011/08/race-conditions-and-functional-global-variables-in-labview/
Tags: NI Software
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Published by: user652422 on December 16, 2008 23:00Hir user652422!
Here is an example:
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Why update your program allows me to update, instead of downloading a new program?
I'm on Windows XP SP3 and a very fast motherboard.
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Hi all
OS = SOLARIS SPARC 64-bit 11
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I am planning a daily backup of the database using cron tasks, do I have to create a simple script. In this script, I will inaugurate the export dump using parameter files. The dump file must contain the date of the backup.
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20141117
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Export: Release 12.1.0.1.0 - Production on Mon Nov 17 11:15:38 2014
Copyright (c) 1982, 2013, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle 12 c Enterprise Edition Release 12.1.0.1.0 - 64 bit Production database
With partitioning, Automatic Storage Management, OLAP, analytical advanced
and Real Application Testing options
Start "SYSTEM". "" SYS_EXPORT_SCHEMA_01 ": directory of system/***@ELMTEST = dpump_dir1 = hrtestexp_20141117.dmp nologfile dumpfile = y
Current estimation using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 0 KB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Object type SCHEMA_EXPORT/SYNONYM/SYNONYM of treatment
Object type SCHEMA_EXPORT/TABLE/TABLE processing
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However when I came all in my parameter file it failed.
UserID=System/Manager@ELMTEST
Directory = dpump_dir1
dumpfile = hrtestexp_$ {mydate} .dmp
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ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-39157: Error adding extension to file ' hrtestexp_$ {mydate} .dmp ".
ORA-07225: sldext: translation error, impossible to expand file name.
Additional information: 7217
Can someone help me on this please?
Thank you very much
Jason
To expand a bit on Richard to answer...
The reason why it works on the command line, not in the file because the command line itself is processed by the processor of the shell. The shell bed processor line, performs substitutions (like your $mydate) environment variables and THEN load the requested executable (expdp) it passing the fully expanded command line.
On the other hand, him parfile is read and processed ONLY by expdp, which knows no substitution of environment variables.
There are several common ways to deal with this.
We have to leave everything right on the command line.
Another would be to have the shell script to write the nominal file as well:
export ORACLE_SID = ELMTEST
Export mydate = "date"+ %Y %m %d"'"
echo $mydate
20141117
export parfile = myparfile.txt
Directory = dpump_dir1 echo > $parfile
dumpfile = hrtestexp_ echo $ {mydate} .dmp > $parfile
echo nologfile = y > $parfile
oraelm@hrmdbd01:/backup/Elm$ system/manager@ELMTEST expdp parfile = $parfile
Another technique is to use the redirection of input:
oraelm@hrmdbd01:/backup/Elm$ expdp system/manager@ELMTEST<>
Directory = dpump_dir1
dumpfile = hrtestexp_$ {mydate} .dmp
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MOE
A few other comments
First of all, as already pointed out, the export is not a backup, at least not a physical backup. To use export for recovery, you must first have a working database. It will be no help if you have a failure of a support on a data file.
Second, you really need to capture a log file, rather than nologfile = y. This log file can be valuable in any number of situations. Why in the world would you delete?
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Hello
It is possible to load data from files dishes mutiple at several tables using a control file in SQL Loader? The flat file to database table relation is 1:1. All data from a flat file goes to a table in the database.
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Hello
I am trying to improve the performance of a 10.2.0.5 database who is suffering from the high value of the log file sync wait. AWR reports show that it is almost never less than 20% of the time of database, normally it is 20-30%, and it is consistently above not-idle wait event. Many sessions he takes 80-90% of the time or more.
Log file parallel write is an order of magnitude lower, probably isn't an I/O problem. The database performs about 100 commits per second, the ratio of user-call-to-commit is about 20, again generated 500 k/s, log buffer is big 14 MB. There are about 6-7 journal file switches per hour on average.
There are several oddities on log file sync wait here and I'd appreciate any help unravel them:
1) there are almost two file sync wait events in the log by a posting on average (number of parallel expectations of log file is about the same number of validations). Why?
(2) according to the ASH, nearly half of log file sync waits take near Ms. 97.7 is something special reason for this pic?
(3) approximately 0.5% of the log file sync waits captured by ASH see the multisecond wait times. No idea where they may come from or how to diagnose this kind of problem?
Some parts of an AWR report below, please let me know if anything else is needed.
Best regards
Nikolai
Cache Sizes ~~~~~~~~~~~ Begin End ---------- ---------- Buffer Cache: 44,592M 44,672M Std Block Size: 16K Shared Pool Size: 3,104M 3,024M Log Buffer: 14,288K Load Profile ~~~~~~~~~~~~ Per Second Per Transaction --------------- --------------- Redo size: 545,833.77 6,659.29 Logical reads: 225,711.23 2,753.73 Block changes: 1,788.11 21.82 Physical reads: 1,195.98 14.59 Physical writes: 119.02 1.45 User calls: 2,368.64 28.90 Parses: 737.35 9.00 Hard parses: 94.58 1.15 Sorts: 261.75 3.19 Logons: 5.93 0.07 Executes: 1,796.12 21.91 Transactions: 81.97 Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time Wait Class ------------------------------ ------------ ----------- ------ ------ ---------- CPU time 23,580 19.8 log file sync 491,840 21,976 45 18.5 Commit db file sequential read 1,902,069 12,604 7 10.6 User I/O read by other session 743,414 4,159 6 3.5 User I/O log file parallel write 220,772 3,069 14 2.6 System I/O ------------------------------------------------------------- Instance Activity Stats ****************** Statistic Total per Second per Trans -------------------------------- ------------------ -------------- ------------- Cached Commit SCN referenced 11,130 3.1 0.0 Commit SCN cached 3 0.0 0.0 DB time 12,547,531 3,483.3 42.5 DBWR checkpoint buffers written 145,437 40.4 0.5 DBWR checkpoints 6 0.0 0.0 ... IMU CR rollbacks 2,566 0.7 0.0 IMU Flushes 36,411 10.1 0.1 IMU Redo allocation size 187,480,124 52,045.3 635.0 IMU commits 255,350 70.9 0.9 IMU contention 11,998 3.3 0.0 IMU ktichg flush 11 0.0 0.0 IMU pool not allocated 4,295 1.2 0.0 IMU recursive-transaction flush 175 0.1 0.0 IMU undo allocation size 2,029,937,952 563,519.5 6,875.1 IMU- failed to get a private str 4,295 1.2 0.0 ... background checkpoints completed 6 0.0 0.0 background checkpoints started 6 0.0 0.0 background timeouts 11,400 3.2 0.0 ... change write time 9,398 2.6 0.0 cleanout - number of ktugct call 54,233 15.1 0.2 cleanouts and rollbacks - consis 9,436 2.6 0.0 cleanouts only - consistent read 2,028 0.6 0.0 ... Instance Activity Stats ******************* Statistic Total per Second per Trans -------------------------------- ------------------ -------------- ------------- commit batch performed 61 0.0 0.0 commit batch requested 61 0.0 0.0 commit batch/immediate performed 94 0.0 0.0 commit batch/immediate requested 94 0.0 0.0 commit cleanout failures: block 51 0.0 0.0 commit cleanout failures: buffer 14 0.0 0.0 commit cleanout failures: callba 8,632 2.4 0.0 commit cleanout failures: cannot 10,575 2.9 0.0 commit cleanouts 991,186 275.2 3.4 commit cleanouts successfully co 971,914 269.8 3.3 commit immediate performed 33 0.0 0.0 commit immediate requested 33 0.0 0.0 commit txn count during cleanout 61,737 17.1 0.2 ... redo blocks written 4,078,889 1,132.3 13.8 redo buffer allocation retries 177 0.1 0.0 redo entries 1,924,106 534.1 6.5 redo log space requests 174 0.1 0.0 redo log space wait time 2,333 0.7 0.0 redo ordering marks 4,553 1.3 0.0 redo size 1,966,229,700 545,833.8 6,659.3 redo subscn max counts 38,227 10.6 0.1 redo synch time 2,233,166 619.9 7.6 redo synch writes 352,935 98.0 1.2 redo wastage 56,259,980 15,618.0 190.5 redo write time 316,495 87.9 1.1 redo writer latching time 19 0.0 0.0 redo writes 220,866 61.3 0.8 rollback changes - undo records 134 0.0 0.0 rollbacks only - consistent read 11,242 3.1 0.0 ... ... transaction rollbacks 94 0.0 0.0 transaction tables consistent re 25 0.0 0.0 transaction tables consistent re 8,704 2.4 0.0 undo change vector size 1,176,156,772 326,506.2 3,983.5 user I/O wait time 2,039,881 566.3 6.9 user calls 8,532,422 2,368.6 28.9 user commits 295,139 81.9 1.0 user rollbacks 122 0.0 0.0 ... -------------------------------------------------------------High "log file synchronization" waits arise also when LGWR is unable to get the CPU to republish on the boy that the log write is complete. The boy expected this event until LGWR may be a sign but if LGWR is unable to get the CPU, it is unable to signal quite quickly.
8 processors for 1 hour is 28 800 seconds. 7 UC is an odd number. This is equivalent to 25 200 seconds available. Your AWR shows that Oracle has represented time seconds 23 580 CPU. So, your server is probably encounter situations where processes are unable to get the CPU.
You can pin or renice LGWR - but you need to check with Oracle Support if this is doable on your platform or supported.
What you need to do is to adjust the sessions that make very high logical reads (a simple rule is 10 k blocks per CPU per second and you hit 225 K blocks for 7 processors!) to reduce the logical reads and CPU consumption.
OR add more CPU.Hemant K Collette
http://hemantoracledba.blogspot.comHemant K Collette
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