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</ul></div></nav><div class="site-inner"><div class="content-sidebar-wrap"><main class="content" id="genesis-content"><article class="post-18166 post type-post status-publish format-standard category-oracle entry" aria-label="ORA-354 ORA-353 and ORA-312: Possible corruption in Online Redo Log File Members in a Redo Log Group" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/ora-354-ora-353-and-ora-312-possible-corruption-in-online-redo-log-file-members-in-a-redo-log-group/">ORA-354 ORA-353 and ORA-312: Possible corruption in Online Redo Log File Members in a Redo Log Group</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>The Problem
Following errors are reported in the alert log file:
ORA-354: corrupt redo log block header
ORA-353: log corruption near block %s change %s time %s
ORA-312: online log %s thread %s: '%s'
ORA-312: online log %s thread %s: '%s'
ORA-312 reports all the redo log file names for the same redo log group number. Example for redo log group number 3 which has two redo log file members:
ORA-00354: corrupt redo log block header
ORA-00353: log corruption near block 1892904 change 878787 &#x02026; <a href="https://www.thegeekdiary.com/ora-354-ora-353-and-ora-312-possible-corruption-in-online-redo-log-file-members-in-a-redo-log-group/" class="more-link">[Read more...] <span class="screen-reader-text">about ORA-354 ORA-353 and ORA-312: Possible corruption in Online Redo Log File Members in a Redo Log Group</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/oracle/" rel="category tag">oracle</a></span> </p></footer></article><article class="post-18161 post type-post status-publish format-standard category-oracle entry" aria-label="How to relocate the redo log files to a different location on disk" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/how-to-relocate-the-redo-log-files-to-a-different-location-on-disk/">How to relocate the redo log files to a different location on disk</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>Offline Method
1. Shut down the database.
2. Copy the online redo log files to the new location. Operating system files, such as online redo log members, must be copied using the appropriate operating system commands.
The following example uses operating system commands (UNIX) to move the online redo log members to a new location:
$ mv /diska/logs/log1a.rdo /diskc/logs/log1c.rdo
$ mv /diska/logs/log2a.rdo /diskc/logs/log2c.rdo
3. Startup the database in mount mode, but do not &#x02026; <a href="https://www.thegeekdiary.com/how-to-relocate-the-redo-log-files-to-a-different-location-on-disk/" class="more-link">[Read more...] <span class="screen-reader-text">about How to relocate the redo log files to a different location on disk</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/oracle/" rel="category tag">oracle</a></span> </p></footer></article><article class="post-18159 post type-post status-publish format-standard category-oracle entry" aria-label="Oracle Database: Redo log operations (Add/Drop/Change Location)" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/oracle-database-redo-log-operations-add-drop-change-location/">Oracle Database: Redo log operations (Add/Drop/Change Location)</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>Question: How to add or drop online redo logs? How to change redo log file location? How to determine the optimal size for redo logs using OPTIMAL_LOGFILE_SIZE?
How to add or drop online redo logs
1. Review information on existing redo logs:
SELECT a.group#, b.member, a.status, a.bytes
FROM v$log a, v$logfile b
WHERE a.group#=b.group#
2. Add new groups:
ALTER DATABASE ADD LOGFILE group 4 ('/log01A.dbf', '/log01B.dbf ') SIZE 512M;
ALTER DATABASE ADD LOGFILE group 5 ('/log02A.dbf', &#x02026; <a href="https://www.thegeekdiary.com/oracle-database-redo-log-operations-add-drop-change-location/" class="more-link">[Read more...] <span class="screen-reader-text">about Oracle Database: Redo log operations (Add/Drop/Change Location)</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/oracle/" rel="category tag">oracle</a></span> </p></footer></article><div class="crunchify_ad_on_home">
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<script>(adsbygoogle=window.adsbygoogle||[]).push({});</script></div><article class="post-18156 post type-post status-publish format-standard category-oracle entry" aria-label="How to add and drop online redo log members and groups in Oracle" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/how-to-add-and-drop-online-redo-log-members-and-groups-in-oracle/">How to add and drop online redo log members and groups in Oracle</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>Mirroring online redo logs
The Oracle database maintains online redo log files to minimize the loss of data in the database. The redo log files record all changes made to data in the database buffer cache with some exceptions; for example, in the case of direct writes.
Redo log files are used in a situation such as an instance failure to recover committed data that has not been written to the data files. The redo log files are only used for recovery.
Online Redo Log Groups
- A set of &#x02026; <a href="https://www.thegeekdiary.com/how-to-add-and-drop-online-redo-log-members-and-groups-in-oracle/" class="more-link">[Read more...] <span class="screen-reader-text">about How to add and drop online redo log members and groups in Oracle</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/oracle/" rel="category tag">oracle</a></span> </p></footer></article><article class="post-18153 post type-post status-publish format-standard category-centos-rhel entry" aria-label="Process are stuck in D-state due to multipathd" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/process-are-stuck-in-d-state-due-to-multipathd/">Process are stuck in D-state due to multipathd</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>For multipaths with queueing enabled and with all paths down, the kernel will store submitted IOs in a queue and resubmit them upon path recovery. Process submitting IOs to these multipath are stuck in D-state (uninterruptible sleep). The 'no_path_retry 4' multipath parameter will instruct the kernel to unplug the queue after 4 failed path-tests.
Unplugging the queue will fail all stored IOs. If the outage will last, the admin might wish to unplug the queues right-away. The following &#x02026; <a href="https://www.thegeekdiary.com/process-are-stuck-in-d-state-due-to-multipathd/" class="more-link">[Read more...] <span class="screen-reader-text">about Process are stuck in D-state due to multipathd</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/centos-rhel/" rel="category tag">CentOS/RHEL</a></span> </p></footer></article><div class="crunchify_ad_on_home">
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<script>(adsbygoogle=window.adsbygoogle||[]).push({});</script></div><article class="post-18150 post type-post status-publish format-standard category-centos-rhel category-linux entry" aria-label="How to Disable RSH Server in CentOS/RHEL" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/how-to-disable-rsh-server-in-centos-rhel/">How to Disable RSH Server in CentOS/RHEL</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>Question: How to completely disable RSH Server, and if necessary, uninstall it?
To disable rsh-server:
1. Verify if rsh-server package is installed:
# rpm -qa | grep rsh-server
2. If above command will return rsh-server package follow below action plan:
# vi /etc/xinetd.d/rlogin
specify there:
disable = yes
3. Remove rsh entry from /etc/securetty file and disable the rsh service to not start after reboot:
# chkconfig rsh off
Above command eg chkconfig does not stop rsh but &#x02026; <a href="https://www.thegeekdiary.com/how-to-disable-rsh-server-in-centos-rhel/" class="more-link">[Read more...] <span class="screen-reader-text">about How to Disable RSH Server in CentOS/RHEL</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/centos-rhel/" rel="category tag">CentOS/RHEL</a>, <a href="https://www.thegeekdiary.com/category/linux/" rel="category tag">Linux</a></span> </p></footer></article><article class="post-18148 post type-post status-publish format-standard category-centos-rhel category-linux entry" aria-label="How to disable NFS client caching in CentOS/RHEL" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/how-to-disable-nfs-client-caching-in-centos-rhel/">How to disable NFS client caching in CentOS/RHEL</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>Occasionally the NFS Client does not read data from NFS exports synchronously, such as when it was written by another NFS Client. For example, after NFS Client A writes a file by "echo hello > /NFS_mountpoint/testfile", NFS Client B can not read the file with "No such file", or can read but the contents of the file could be old one.
NFS Clients caches various NFS data. RFC 1813 for NFSv3 specification says:
Clients can perform caching in varied manner.
and also says:
The NFS version 3 &#x02026; <a href="https://www.thegeekdiary.com/how-to-disable-nfs-client-caching-in-centos-rhel/" class="more-link">[Read more...] <span class="screen-reader-text">about How to disable NFS client caching in CentOS/RHEL</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/centos-rhel/" rel="category tag">CentOS/RHEL</a>, <a href="https://www.thegeekdiary.com/category/linux/" rel="category tag">Linux</a></span> </p></footer></article><div class="crunchify_ad_on_home">
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<script>(adsbygoogle=window.adsbygoogle||[]).push({});</script></div><article class="post-18146 post type-post status-publish format-standard category-centos-rhel category-centos-rhel-7 entry" aria-label="How to Hot-add and Remove Logical Memory in CentOS/RHEL 7" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/how-to-hot-add-and-remove-logical-memory-in-centos-rhel-7/">How to Hot-add and Remove Logical Memory in CentOS/RHEL 7</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>This post explains how to use memory hotplug to increase/decrease the amount of memory.
To see (online/offline) state of memory section, read 'state' file.
# grep line /sys/devices/system/memory/*/state
/sys/devices/system/memory/memory0/state:online
/sys/devices/system/memory/memory1/state:online
/sys/devices/system/memory/memory2/state:online
/sys/devices/system/memory/memory3/state:online
/sys/devices/system/memory/memory4/state:online
To set a memory[x] to online/offline:
# echo &#x02026; <a href="https://www.thegeekdiary.com/how-to-hot-add-and-remove-logical-memory-in-centos-rhel-7/" class="more-link">[Read more...] <span class="screen-reader-text">about How to Hot-add and Remove Logical Memory in CentOS/RHEL 7</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/centos-rhel/" rel="category tag">CentOS/RHEL</a>, <a href="https://www.thegeekdiary.com/category/centos-rhel/centos-rhel-7/" rel="category tag">CentOS/RHEL 7</a></span> </p></footer></article><article class="post-18133 post type-post status-publish format-standard category-mysql category-mysql-cluster entry" aria-label="MySQL Cluster requirements to avoid Single Point of Failure" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/mysql-cluster-requirements-to-avoid-single-point-of-failure/">MySQL Cluster requirements to avoid Single Point of Failure</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>In this post, we will discuss the minimum requirements to have no single point of failure for all services in a MySQL Cluster setup. To remove all single points of failure there are the following requirements to the Cluster configuration:
There must be two copies of the data
To allow API and data nodes to come online, there must be at least two management nodes
There must be at least two API nodes
If one of the data nodes goes offline, an arbitrator must be present
Note: The above &#x02026; <a href="https://www.thegeekdiary.com/mysql-cluster-requirements-to-avoid-single-point-of-failure/" class="more-link">[Read more...] <span class="screen-reader-text">about MySQL Cluster requirements to avoid Single Point of Failure</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/mysql/" rel="category tag">mysql</a>, <a href="https://www.thegeekdiary.com/category/mysql/mysql-cluster/" rel="category tag">MySQL Cluster</a></span> </p></footer></article><article class="post-18128 post type-post status-publish format-standard category-mysql category-mysql-cluster entry" aria-label="What is an Arbitrator in MySQL Cluster" itemscope itemtype="https://schema.org/CreativeWork"><header class="entry-header"><h2 class="entry-title" itemprop="headline"><a class="entry-title-link" rel="bookmark" href="https://www.thegeekdiary.com/what-is-an-arbitrator-in-mysql-cluster/">What is an Arbitrator in MySQL Cluster</a></h2>
<p class="entry-meta">By <span class="entry-author" itemprop="author" itemscope itemtype="https://schema.org/Person"><a href="https://www.thegeekdiary.com/author/sandeep_patil/" class="entry-author-link" rel="author" itemprop="url"><span class="entry-author-name" itemprop="name">admin</span></a></span> </p></header><div class="entry-content" itemprop="text"><p>If one or more nodes in a cluster fail, it is possible that not all cluster nodes will not be able to "see" one another. In fact, it is possible that two sets of nodes might become isolated from one another in a network partitioning, also known as a "split brain" scenario. This type of situation is undesirable because each set of nodes tries to behave as though it is the entire cluster.
When cluster nodes go down, there are two possibilities. If more than 50% of the remaining nodes can &#x02026; <a href="https://www.thegeekdiary.com/what-is-an-arbitrator-in-mysql-cluster/" class="more-link">[Read more...] <span class="screen-reader-text">about What is an Arbitrator in MySQL Cluster</span></a></p></div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.thegeekdiary.com/category/mysql/" rel="category tag">mysql</a>, <a href="https://www.thegeekdiary.com/category/mysql/mysql-cluster/" rel="category tag">MySQL Cluster</a></span> </p></footer></article><div class="archive-pagination pagination"><div class="pagination-next alignright"><a href="https://www.thegeekdiary.com/page/2/">Next Page &#x000BB;</a></div></div></main><aside class="sidebar sidebar-primary widget-area" role="complementary" aria-label="Primary Sidebar" itemscope itemtype="https://schema.org/WPSideBar" id="genesis-sidebar-primary"><h2 class="genesis-sidebar-title screen-reader-text">Primary Sidebar</h2><section id="search-2" class="widget widget_search"><div class="widget-wrap"><form class="search-form" method="get" action="https://www.thegeekdiary.com/" role="search" itemprop="potentialAction" itemscope itemtype="https://schema.org/SearchAction"><label class="search-form-label screen-reader-text" for="searchform-1">Search this website</label><input class="search-form-input" type="search" name="s" id="searchform-1" placeholder="Search this website" itemprop="query-input"><input class="search-form-submit" type="submit" value="Search"><meta content="https://www.thegeekdiary.com/?s={s}" itemprop="target"></form></div></section>
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