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https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/chap-oracle_9i_and_10g_tuning_guide-enabling_asynchronous_io_and_direct_io_support
Enabling Asynchronous I/O and Direct I/O Support Asynchronous I/O permits Oracle to continue processing after issuing I/Os requests which leads to higher I/O performance. Red Hat Enterprise Linux also allows Oracle to issue multiple simultaneous I/O requests with a single system call.
https://blog.toadworld.com/enable_direct_and_asynchronous_i/o
Mar 12, 2013 · Enabling Direct I/O. Oracle provides a number of different ways of ensuring the performance of I/O write requests is optimal, including the use of direct I/O and asynchronous I/O (see below for more details on asynchronous I/O).
https://www.ibm.com/support/knowledgecenter/en/SSWT9A_7.5.0/com.ibm.tusc.inswl.doc/install/t_ccmdb_enableaio.html
Without asynchronous I/O, DB2 and Oracle database instances cannot be started successfully. Enabling asynchronous I/O on AIX SmartCloud Control Desk, Version 7.5
https://www.ibm.com/support/knowledgecenter/en/SSLKT6_7.6.0/com.ibm.mam.inswl.doc/install/t_ccmdb_enableaio.html
Asynchronous I/O must be enabled on AIX systems if the system hosts IBM Tivoli Directory Server. Without asynchronous I/O, DB2® database instances cannot be started successfully. Without asynchronous I/O, Oracle database instances cannot be started successfully. To enable asynchronous I/O, follow these steps:
https://sc19.supercomputing.org/proceedings/workshops/workshop_files/ws_pdsw109s2-file1.pdf
Enabling Transparent Asynchronous I/O using Background Threads Houjun Tang, Quincey Koziol, Suren Byna, ... To overcome these issues, we present an asynchronous I/O framework that provides support for all I/O operations and manages data dependencies transparently and automatically.
http://www.dbatodba.com/db2/how-to-do/how-to-enable-asynchronous-i-o-aio-support-on-linux-for-db2-9.1
How to enable asynchronous I/O (AIO) support on Linux for DB2 9.1. setting DB2LINUXAIO variable to true The DB2LINUXAIO enables asynchronous I/O (AIO) support on Linux operating systems. AIO allows DB2 processes to use system resources more effectively. For example, a DB2 process can perform other work while waiting for an I/O request to be ...
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc35823.1550/html/uconfig/BBCBEAGF.htm
Enabling asynchronous disk I/O. ... enable asynchronous I/O by installing the HP asynchronous I/O driver from SAM. For help with installing this driver, contact your operating system administrator or HP technical support. Before executing the following instructions, shut down Adaptive Server (or …
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/sect-oracle_9i_and_10g_tuning_guide-enabling_asynchronous_io_and_direct_io_support-relinking_oracle_10g_to_enable_asynchronous_io_support
10g Release 2 is shipped with asynchronous I/O support enabled. This means that 10g Release 2 does not need to be relinked. However, there is a bug in Oracle 10.1.0.2 that causes asynchronous I/O not to be installed correctly which can result in poor DB performance, see Bug:3438751 and Note:270213.1.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/chap-oracle_9i_and_10g_tuning_guide-enabling_asynchronous_io_and_direct_io_support
Enabling Asynchronous I/O and Direct I/O Support Asynchronous I/O permits Oracle to continue processing after issuing I/Os requests which leads to higher I/O performance. Red Hat Enterprise Linux also allows Oracle to issue multiple simultaneous I/O requests with a single system call.
https://www.ibm.com/support/knowledgecenter/en/SSLKT6_7.6.0/com.ibm.mam.inswl.doc/install/t_ccmdb_enableaio.html
In the System Management Interface tool (SMIT) dialog box, select Configure Defined Asynchronous I/O, and then click Enter. Restart the system to enable the changes.
https://blog.toadworld.com/enable_direct_and_asynchronous_i/o
Mar 12, 2013 · Enabling Direct I/O. Oracle provides a number of different ways of ensuring the performance of I/O write requests is optimal, including the use of direct I/O and asynchronous I/O (see below for more details on asynchronous I/O).
http://www.dbatodba.com/db2/how-to-do/how-to-enable-asynchronous-i-o-aio-support-on-linux-for-db2-9.1
The DB2LINUXAIO enables asynchronous I/O (AIO) support on Linux operating systems. AIO allows DB2 processes to use system resources more effectively. For example, a DB2 process can perform other work while waiting for an I/O request to be completed. The libaio.so.1 shared library is required to …
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/sect-oracle_9i_and_10g_tuning_guide-enabling_asynchronous_io_and_direct_io_support-relinking_oracle_10g_to_enable_asynchronous_io_support
10g Release 2 is shipped with asynchronous I/O support enabled. This means that 10g Release 2 does not need to be relinked. However, there is a bug in Oracle 10.1.0.2 that causes asynchronous I/O not to be installed correctly which can result in poor DB performance, see Bug:3438751 and Note:270213.1.
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc35823.1550/html/uconfig/BBCBEAGF.htm
Enabling asynchronous disk I/O. ... enable asynchronous I/O by installing the HP asynchronous I/O driver from SAM. For help with installing this driver, contact your operating system administrator or HP technical support. Before executing the following instructions, shut down Adaptive Server (or …
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc35823.1570/html/uconfig/BBCBEAGF.htm
Enabling asynchronous disk I/O. ... enable asynchronous I/O by installing the HP asynchronous I/O driver from SAM. For help with installing this driver, contact your operating system administrator or HP technical support. Before executing the following instructions, shut down Adaptive Server (or …
https://oracle-base.com/articles/misc/direct-and-asynchronous-io
This allows asynchronous I/O to bypass some of the performance bottlenecks associated with I/O operations. Oracle can take advantage of direct I/O and asynchronous I/O on supported platforms using the FILESYSTEMIO_OPTIONS parameter, whose possible values are listed below. ASYNCH - Enabled asynchronous I/O where possible.
https://sc19.supercomputing.org/proceedings/workshops/workshop_files/ws_pdsw109s2-file1.pdf
Enabling Transparent Asynchronous I/O using Background Threads Houjun Tang, Quincey Koziol, Suren Byna, ... To overcome these issues, we present an asynchronous I/O framework that provides support for all I/O operations and manages data dependencies transparently and automatically.
https://oracle-base.com/articles/misc/direct-and-asynchronous-io
Oracle can take advantage of direct I/O and asynchronous I/O on supported platforms using the FILESYSTEMIO_OPTIONS parameter, whose possible values are listed below. ASYNCH - Enabled asynchronous I/O where possible. DIRECTIO- Enabled direct I/O where possible. SETALL- Enabled both direct I/O and asynchronous I/O where possible.
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc35823.1570/html/uconfig/BBCBEAGF.htm
To enable asynchronous I/O: From the SAM Kernel Configuration menu, choose Drivers and set the Pending State for asyncdisk to In by adding the driver. An alternate step could be done by adding the asyncdsk subsystem keyword to /stand/system .
https://docs.microsoft.com/en-us/windows/win32/fileio/synchronous-and-asynchronous-i-o
A thread performing asynchronous file I/O sends an I/O request to the kernel by calling an appropriate function. If the request is accepted by the kernel, the calling thread continues processing another job until the kernel signals to the thread that the I/O operation is complete.
https://www.ge.com/digital/documentation/ifix/Subsystems/OPCCLNT/content/feature___asynchronous_vs_synchronous_i_o.htm
Asynchronous I/O, by comparison, does not enable the OPC Client to poll the server; it provides data between the driver and the OPC server on an exception basis. Using Asynchronous I/O, the server notifies the OPC Client when data has exceeded the user-supplied percent deadband.
https://shettymayur.blogspot.com/2012/01/enabling-asynchronous-io-and-direct-io.html
Jan 13, 2012 · If you also wish to enable Direct I/O Support, set filesystemio_options to "setall". As per the documentation "For Red Hat Enterprise Linux 5, it is strongly recommended to use “setall” for ext2, ext3, GFS, NFS and OCFS2 file systems." Below is what I did to enable asynchronous I/O and direct I/O for my Oracle 11g R2 database.
http://bio.gsi.de/DOCS/www.coredumps.de/doc/ibm/aix/aix_hints_and_tips/8611004.htm
Also, multiple asynchronous I/O operations may run at the same time on one or more devices or files. Each asynchronous I/O request has a corresponding control block in the application's address space. When an asynchronous I/O request is made, a handle is established in the control block.
https://support.microsoft.com/en-us/help/156932/asynchronous-disk-i-o-appears-as-synchronous-on-windows
Jun 25, 2015 · File I/O on Microsoft Windows can be synchronous or asynchronous. The default behavior for I/O is synchronous, where an I/O function is called and returns when the I/O is complete. Asynchronous I/O allows an I/O function to return execution back to the caller immediately, but the I/O is not assumed to be complete until some future time.
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc35823.1572/doc/html/san1334282774266.html
Aug 01, 2012 · Enabling Asynchronous Disk I/O on Linux The total number of system-wide reservable I/O descriptors (aio-max-nr) minus the current number of descriptors reserved by all processes (aio-nr) must be sufficient to accommodate the value for max async i/os per engine.
https://www.tutorialspoint.com/operating_system/os_io_hardware.htm
Operating System - I/O Hardware. ... Asynchronous I/O − I/O proceeds concurrently with CPU execution. Communication to I/O Devices. The CPU must have a way to pass information to and from an I/O device. There are three approaches available to communicate with the CPU and Device.
http://davmac.org/davpage/linux/async-io.html
Asynchronous I/O and event notification on linux. Updated 15/6/2008: Added proper introduction, general cleanups, made the problems with POSIX AIO clearer. Updated 22/9/2009:Re-ordered the sections a bit, added information on the difference between edge- and level-triggered notification mechanisms, and added information on signalfd() and the "signal handler writes to pipe" techniques.
https://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:1257800375707
For example, tape devices (which are notoriously slow) do not support asynchronous I/O. By using I/O slaves, we can mimic for tape drives what the operating system normally provides for disk drives. Just as with true asynchronous I/O, the process writing to the device batches a large amount of data and hands it off to be written.
http://www.dba-oracle.com/real_application_clusters_rac_grid/asynchronous.htm
Asynchronous I/O enables write intensive processes like Oracle's DBWn to make full use of the I/O bandwidth of the hardware, by queuing I/O requests to distinct devices in quick succession so that they can be processed largely in parallel.
http://www.research.cs.rutgers.edu/~parashar/Papers/dart_hpdc.pdf
Asynchronous Remote Transfers), an efficient data transfer substrate that effectively addresses these re-quirements. DART is a thin software layer built on RDMA technology to enable fast, low-overhead and asynchronous access to data from a running simula-tion, and support …
https://docs.microsoft.com/en-us/windows/win32/ipc/synchronous-and-overlapped-input-and-output
Using asynchronous I/O enables a pipe server to use a loop that performs the following steps: Specify multiple event objects in a call to the wait function, and wait for one of the objects to be set to the signaled state. Use the wait function's return value to determine which overlapped operation has finished.
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