SQL

• The Read Committed Isolation Level - Paul White

  http://sqlperformance.com/2014/04/t-sql-queries/the-read-committed-isolation-level

• Causes of IO_COMPLETION and WRITE_COMPLETION SQL Server wait types

  http://www.sqlskills.com/blogs/paul/causes-io_completion-write_completion-sql-server-wait-types

     

• Delayed Durability in SQL Server 2014 - Aaron Bertrand

  http://sqlperformance.com/2014/04/io-subsystem/delayed-durability-in-sql-server-2014

     

• How Automatic Updates to Statistics Can Affect Query Performance

  http://sqlperformance.com/2014/05/sql-performance/auto-stats-effects

     

• SQLskills community mentoring ? round 6

  http://www.sqlskills.com/blogs/paul/sqlskills-community-mentoring-round-6/

     

• Optimizing Transaction Log Throughput

  https://www.simple-talk.com/sql/database-administration/optimizing-transaction-log-throughput/

     

• Dream DBA

  http://www.pythian.com/blog/how-to-become-a-dream-dba/

• Shrinking tempdb no longer prohibited

  http://www.sqlskills.com/blogs/paul/shrinking-tempdb-longer-prohibited

• Introducing sp_BlitzCache™

  http://www.brentozar.com/archive/2014/05/introducing-sp_blitzcache/

     

• Clustered Columnstore Indexes: Exploring Delta Store and Delete Bitmap

  http://aboutsqlserver.com/2014/05/06/clustered-columnstore-indexes-exploring-delta-store-and-delete-bitmap/

     

• The Cardinality Estimator in SQL Server 2014 ? Going Forward and Backward

  http://voiceofthedba.wordpress.com/2014/04/30/the-cardinality-estimator-in-sql-server-2014-going-forward-and-backward/

     

• 4 Lightweight Ways to Tell if a Database is Used

  http://www.brentozar.com/archive/2014/05/4-lightweight-ways-tell-database-used/

     

• SQL Server Debugging with WinDbg ? an Introduction

  http://www.sqlpassion.at/archive/2014/05/05/sql-server-debugging-with-windbg-an-introduction/

     

• How to Restore a Certificate in SQL Server

  http://sqlity.net/en/2384/restore-certificate/

     

• SQL intersection slides and samples

  http://sqlperformance.com/2014/04/sql-performance/sql-intersection-slides-and-samples

     

• SELECT INTO ? Moving Data From A To B

  http://kejser.org/databases/select-into-moving-data-from-a-to-b/

     

• Cannot Failover Nodes Using TempDB on Local Storage

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/08/cannot-failover-nodes-using-tempdb-on-local-storage.aspx

     

• Further Testing with Automatic Updates to Statistics

  http://www.sqlskills.com/blogs/erin/testing-automatic-updates-statistics

     

• DBA Myths: TRUNCATE TABLE deletes all the rows of a table instantly.

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/30/dba-myths-truncate-table-deletes-all-the-rows-of-a-table-instantly.aspx

     

• Differential Changed Map (DCM): How SQL Server Tracks Changed Pages

  http://sqlity.net/en/2387/dcm/

     

• SQL Server 2014 Clustered Columnstore Indexes and Partitioning

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/01/sql-server-2014-clustered-columnstore-indexes-and-partitioning.aspx

     

• Migrating SQL Server logins

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/07/migrating-sql-server-logins.aspx

     

• Using Kerberos With SQL Server ? Part 1 ? Double Hop

  http://www.seangallardy.com/2014/05/using-kerberos-with-sql-server-part-1-double-hop

     

• Using Kerberos With SQL Server ? Part 2 ? Across Domains

  http://www.seangallardy.com/2014/05/using-kerberos-with-sql-server-part-2-across-domains

     

• Configuring SQL Server 2012 Always On Lab- Part 1

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/05/configuring-sql-server-2012-always-on-lab-part-1.aspx

     

• Why is there a sysobjects when we already have sys.objects?

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/05/why-is-there-a-sysobjects-when-we-already-have-sys-objects.aspx

     

• Does SQL Server do a CHECKDB during an instance restart?

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/07/does-sql-server-do-a-checkdb-during-an-instance-restart.aspx

     

• SQL SERVER ? What is SSAS Tabular Data model and Why to use it ? Part 2

  http://blog.sqlauthority.com/2014/05/07/sql-server-what-is-ssas-tabular-data-model-and-why-to-use-it-part-2/

     

LINKS

• Friday Followup For May 2, 2014

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/05/02/friday-followup-for-may-2-2014.aspx

     

• Log Buffer #369, A Carnival of the Vanities for DBAs

  http://www.pythian.com/blog/log-buffer-369-a-carnival-of-the-vanities-for-dbas/

     

• LAST WEEKS TOP "READING" LINKS #82

  http://www.jasonstrate.com/2014/05/last-weeks-top-reading-links-82/

     

Other

• DynamoDB의 Write Capacity를 낮춰서 DynamoDB 비용 줄이기

  http://readme.skplanet.com/?p=7570

     

• Use MySQL to store NoSQL and SQL data in the same database using memcached and InnoDB

  https://scriptingmysql.wordpress.com/2014/05/01/use-mysql-to-store-nosql-and-sql-data-in-the-same-database-using-memcached-and-innodb/

     

• Parallel Query for MySQL with Shard-Query

  http://java.dzone.com/articles/parallel-query-mysql-shard

     

• How to identify and cure MySQL replication slave lag

  http://www.mysqlperformanceblog.com/2014/05/02/how-to-identify-and-cure-mysql-replication-slave-lag/

     

• Row-based replication, MySQL 5.6 upgrades and temporal data types

  http://www.mysqlperformanceblog.com/2014/05/06/row-based-replication-mysql-5-6-upgrades-and-temporal-data-types/

SQL

• How It Works: Behavior of a 1 Trillion Row Index Build (Gather Streams from SORT)

  http://blogs.msdn.com/b/psssql/archive/2014/04/29/how-it-works-behavior-of-a-1-trillion-row-index-build-gather-streams-from-sort.aspx

• Memory and IO in Tempdb: SQL 2014 Improvement

  http://www.brentozar.com/archive/2014/04/memory-ssd-tempdb-temp-table-sql-2014/

     

• SQL Server Quickie #13 ? Hash Join Operator

  http://www.sqlpassion.at/archive/2014/04/29/sql-server-quickie-13-hash-join-operator

     

• SQL SERVER ? Working with Change Data Capture ? Part 2

  http://raresql.com/2014/04/29/sql-server-working-with-change-data-capture-part-2/

     

• Five tips to avoid a performance bottleneck or other SQL Server snares

  http://searchsqlserver.techtarget.com/tip/Five-tips-to-avoid-a-performance-bottleneck-or-other-SQL-Server-snares

     

• How to grab multiple parent/child elements from XML Data Source

  http://blogs.msdn.com/b/psssql/archive/2014/04/29/how-to-grab-multiple-parent-child-elements-from-xml-data-source.aspx

     

LINKS

• Last Weeks Top "Reading" Links #81

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/28/last-weeks-top-reading-links-81.aspx

SQL

• Delayed Durability in SQL Server 2014

  http://www.sqlperformance.com/2014/04/io-subsystem/delayed-durability-in-sql-server-2014

     

• The default autogrowth settings do NOT come from the Model database.

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/28/the-default-autogrowth-settings-do-not-come-from-the-model-database.aspx

     

• PowerShell-Input-Validation Scripts

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/28/powershell-input-validation-scripts.aspx

     

• The Performance of Traversing a SQL Hierarchy

  https://www.simple-talk.com/sql/performance/the-performance-of-traversing-a-sql-hierarchy-/

     

• Last week in Azure SQL Database ? Part 1

  http://www.sqlskills.com/blogs/bobb/last-week-azure-sql-database-part-1/

     

LINKS

• Log Buffer #368, A Carnival of the Vanities for DBAs

  http://www.pythian.com/blog/log-buffer-368-a-carnival-of-the-vanities-for-dbas/

     

Other

• OOM relation to vm.swappiness=0 in new kernel

  http://www.mysqlperformanceblog.com/2014/04/28/oom-relation-vm-swappiness0-new-kernel/

     

• Installing and Running HDP 2.1 on Windows

  http://www.sqlskills.com/blogs/bobb/installing-running-hdp-2-1-windows/

     

• ICYMI: Data platform momentum

  http://blogs.technet.com/b/dataplatforminsider/archive/2014/04/28/icymi-data-platform-momentum.aspx

SQL

• Video: SQL Server Performance Tuning with Wait Statistics (CXPACKET)

  http://www.connectsql.com/2014/04/video-sql-server-performance-tuning_27.html

     

• SQLAuthority News ? Microsoft Whitepaper ? Optimizing Your Query Plans with the SQL Server 2014 Cardinality Estimator

  http://blog.sqlauthority.com/2014/04/26/sqlauthority-news-microsoft-whitepaper-optimizing-your-query-plans-with-the-sql-server-2014-cardinality-estimator/

     

• Introduction to Extended Events (video)

  http://www.brentozar.com/archive/2014/04/introduction-extended-events/

     

• Whaddayaknow 'bout #SQLServer Trace Flag 4134?

  http://sql-sasquatch.blogspot.kr/2014/04/whaddayaknow-bout-sqlserver-trace-flag.html

     

• Excessive logging pre-SQL 2012 when changing variable length columns from NULL to NOT NULL

  http://sqlscope.wordpress.com/2014/04/26/excessive-logging-pre-sql-2012-when-changing-variable-length-columns-from-null-to-not-null/

     

• SQL Injection: How it Works and How to Thwart it

  https://www.simple-talk.com/sql/database-administration/sql-injection-how-it-works-and-how-to-thwart-it/

     

• How to Create a Database Master Key

  http://sqlity.net/en/2373/create-database-master-key/

     

• 10 reasons why I HAte you!

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/25/10-reasons-why-i-hate-you.aspx

     

• Database Performance Investigation/Intervention, MTPoD, Last Resorts

  http://sql-sasquatch.blogspot.kr/2014/04/database-performance.html

     

• SQL Server Reporting Services Basics: Building SSRS Reports

  https://www.simple-talk.com/sql/reporting-services/sql-server-reporting-services-basics-building-ssrs-reports/

     

• MDX Cell Properties Supported By Excel

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/25/mdx-cell-properties-supported-by-excel.aspx

     

• What does PCI DSS mean for your SQL Server environment?

  http://www.mssqltips.com/sqlservertip/3216/what-does-pci-dss-mean-for-your-sql-server-environment/

     

LINKS

• Friday Followup For April 25, 2014

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/25/friday-followup-for-april-25-2014.aspx

     

     

Other

• The other side of Big Data. Interview with Michael L. Brodie.

  http://www.odbms.org/blog/2014/04/side-big-data-interview-michael-l-brodie/

     

• Managing farms of MySQL servers with MySQL Fabric

  http://www.mysqlperformanceblog.com/2014/04/25/managing-farms-of-mysql-servers-with-mysql-fabric/

     

• 왜 일이 예상대로 끝나지 않는가?

  http://www.mimul.com/pebble/default/2014/04/25/1398387387079.html

SQL

• Version 9.04.0013 of the RML Utilities for x86 and x64 has been released to the download center

  http://blogs.msdn.com/b/psssql/archive/2014/04/24/version-9-04-0013-of-the-rml-utilities-for-x86-and-x64-has-been-released-to-the-download-center.aspx

     

• "If You Can't Do ____, You're Not a Production DBA"

  http://www.brentozar.com/archive/2014/04/youre-not-a-dba-if-you-cant-do-this-one-trick/

     

• Prevent multiple users from running the same SQL Server stored procedure at the same time

  http://www.mssqltips.com/sqlservertip/3202/prevent-multiple-users-from-running-the-same-sql-server-stored-procedure-at-the-same-time/

     

• Most Recent Cumulative Updates for SQL Server 2008-2014

  http://www.sqlskills.com/blogs/glenn/most-recent-cumulative-updates-for-sql-server-2008-2014/

     

LINKS

• (SFTW) SQL Server Links 25/04/14

  http://www.johnsansom.com/sftw-sql-server-links-250414/

     

     

Other

• 빠르게 훝어 보는 node.js - #10 Socket.IO 2/4 API 요약

  http://bcho.tistory.com/899

     

• Encrypted and incremental MySQL backups with Percona XtraBackup

  http://www.mysqlperformanceblog.com/2014/04/24/encrypted-and-incremental-mysql-backups-with-percona-xtrabackup/

SQL

• SQL Server bitmap operators, bitmasks and bit arrays

  http://dataidol.com/tonyrogerson/2014/04/23/sql-server-bitmap-operators-bitmasks-and-bit-arrays/

• Top Clause and Other Factors in Problematic Execution Plans

  http://sqlblog.com/blogs/joe_chang/archive/2014/04/23/top-clause-and-other-factors-in-problematic-execution-plans.aspx

• The Shared Global Allocation Map (SGAM)

  http://sqlity.net/en/2364/sgam/

     

• 6 Essential Tips for Managing SQL Server

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/23/6-essential-tips-for-managing-sql-server.aspx

     

• Developer's Guide to Understanding DBAs [Video]

  http://www.brentozar.com/archive/2014/04/developers-guide-understanding-dbas-video/

     

• SQL Server Partitioning 101

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/23/sql-server-partitioning-101.aspx

     

• Yes, you can install SQL Server 2014 Books Online locally

  http://sqlblog.com/blogs/aaron_bertrand/archive/2014/04/23/yes-you-can-install-sql-server-2014-books-online-locally.aspx

     

• Introducing the Microsoft Analytics Platform System ? the turnkey appliance for big data analytics

  http://blogs.technet.com/b/dataplatforminsider/archive/2014/04/23/introducing-the-microsoft-analytics-platform-system-the-turnkey-appliance-for-big-data-analytics.aspx

     

• Database Normalization Basics

  https://www.simple-talk.com/sql/t-sql-programming/database-normalization-basics

     

• How Do I Show Memory Usage From A Columnstore Index in SQL Server?

  http://joedantoni.wordpress.com/2014/04/23/how-do-i-show-memory-usage-from-a-columnstore-index-in-sql-server/

     

• RS, SharePoint and Forefront UAG Series ? Intro

  http://blogs.msdn.com/b/psssql/archive/2014/04/23/rs-sharepoint-and-forefront-uag-series-intro.aspx

     

• SSAS Deployment Strategies

  http://www.sql-server-performance.com/2014/ssas/

     

LINKS

• Last Weeks Top "Reading" Links #80

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/22/last-weeks-top-reading-links-80.aspx

     

Other

• Azure Automation

  http://www.scarydba.com/2014/04/23/azure-automation/

     

• 사이드 프로젝트의 효용성 그리고 중요성

  http://www.mimul.com/pebble/default/2014/04/23/1398212595197.html

UPDATE

• SQL Server 2014 Cumulative Update #1 is Available

  http://sqlblog.com/blogs/aaron_bertrand/archive/2014/04/21/sql-server-2014-cumulative-update-1-is-available.aspx

• KB Article: KB #2931693
• 114 fixes listed at time of publication (121 total)
• Build number is 12.0.2342
• Relevant for @@VERSION 12.0.2000 through 12.0.2341

• April 2014 Cumulative Update for SQL Server 2008 R2 SP2        

  http://sqlblog.com/blogs/aaron_bertrand/archive/2014/04/21/april-2014-cumulative-update-for-sql-server-2008-r2-sp2.aspx        

• KB Article: KB #2938478
• 13 fixes listed at time of publication
• Build number is 10.50.4305
• Relevant for @@VERSION 10.50.4000 through 10.50.4304        

     

SQL

• The Repeatable Read Isolation Level- Paul White

  http://www.sqlperformance.com/2014/04/t-sql-queries/the-repeatable-read-isolation-level

• Cardinality Estimation for Correlated Columns

  http://www.sqlpassion.at/archive/2014/04/22/cardinality-estimation-for-correlated-columns

     

• SQL Server XML Questions You Were Too Shy To Ask

  https://www.simple-talk.com/sql/learn-sql-server/sql-server-xml-questions-you-were-too-shy-to-ask/

     

• SQL Server: Win some, learn some... try a whole buncha

  http://sql-sasquatch.blogspot.kr/2014/04/sql-server-win-some-learn-some-try.html

     

• Dangers of giving dbo in MSDB

  http://jongurgul.com/blog/dangers-giving-dbo-msdb

     

• DAX: Always get the Latest date for a slicer

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/22/dax-always-get-the-latest-date-for-a-slicer.aspx

     

• Microsoft Azure SQL Database Security - Firewall Configuration

  http://www.databasejournal.com/features/mssql/microsoft-azure-sql-database-security-firewall-configuration.html

     

Other

• Using mysqldump and the MySQL binary log ? a quick guide on how to backup and restore MySQL databases

  http://scriptingmysql.wordpress.com/2014/04/22/using-mysqldump-and-the-mysql-binary-log-a-quick-guide-on-how-to-backup-and-restore-mysql-databases/

SQL

• SQL Server Diagnostic Information Queries for April 2014

  http://sqlserverperformance.wordpress.com/2014/04/18/sql-server-diagnostic-information-queries-for-april-2014/

• Delayed durability: performance boost for certain workloads

  http://sqlscope.wordpress.com/2014/04/21/delayed-durability-performance-boost-for-certain-workloads/

     

• Disabling An Index Removes Index Data

  http://shaunjstuart.com/archive/2014/04/disabling-an-index-removes-index-data/

     

• New Book: SQL Server 2014 Query Tuning & Optimization

  http://www.benjaminnevarez.com/2014/04/new-book-sql-server-2014-query-tuning-optimization/

     

• Unexpected View Performance

  http://www.sqlservercentral.com/articles/Views/71787/

     

• Auto Fix Orphaned Users

  http://sqlity.net/en/2353/auto-fix-orphaned-users/

     

• The SQL Server Encryption Hierarchy

  http://sqlity.net/en/2357/encryption-hierarchy/

     

• Web Services And POST Requests In Power Query

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/19/web-services-and-post-requests-in-power-query.aspx

     

• Collation: Temporary objects and variables: Demonstration

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/21/collation-temporary-objects-and-variables-demonstration.aspx

     

• Central Management Studio CMS

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/21/central-management-studio-cms.aspx

     

• Automating Database Restores

  http://www.sqlservercentral.com/articles/Backup/108907/

     

LINKS

• Friday Followup For April 18, 2014

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/18/friday-followup-for-april-18-2014.aspx

     

Other

• MySQL Partitioning ? A Quick Look at Partitioning ? Separate Your Data for Faster Searches

  http://scriptingmysql.wordpress.com/2014/04/18/mysql-partitioning-a-quick-look-at-partitioning-separate-your-data-for-faster-searches/

     

• R and the weather in the local news

  http://blog.revolutionanalytics.com/2014/04/r-and-the-weather-in-the-local-news.html

     

• 무료 node.js 개발툴

  http://bcho.tistory.com/895

     

• 빠르게 훝어 보는 node.js - #9 Socket.IO 1/2

  http://bcho.tistory.com/896

SQL

• MSDN Whitepaper: More Cowbell?Optimizing Your Query Plans with the SQL Server 2014 Cardinality Estimator

  http://www.sqlserver.co.uk/index.php/msdn-whitepaper-more-cowbell-optimizing-your-query-plans-with-the-sql-server-2014-cardinality-estimator/

• SSMS Auto Recovery

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/17/ssms-auto-recovery.aspx

     

• XML Schema validation in SQL Server

  http://www.sqlservercentral.com/articles/XML/108041/

     

• SQL Server 2014 Backup to the Cloud

  http://sqlblog.com/blogs/john_paul_cook/archive/2014/04/17/sql-server-2014-backup-to-the-cloud.aspx

     

• Use Extended Events to Get More Information About failed SQL Server Login Attempts

  http://www.mssqltips.com/sqlservertip/3214/use-extended-events-to-get-more-information-about-failed-sql-server-login-attempts/

     

• The Global Allocation Map (GAM)

  http://sqlity.net/en/2351/gam/

     

LINKS

• Log Buffer #367, A Carnival of the Vanities for DBAs

  http://www.pythian.com/blog/log-buffer-367-a-carnival-of-the-vanities-for-dbas/

     

Other

• How to find bugs in MySQL

  http://www.mysqlperformanceblog.com/2014/04/17/how-to-find-bugs-in-mysql/

     

• Real MariaDB 출간

  http://cafe.naver.com/realmysql/614

  http://www.yes24.com/24/goods/12653486?scode=029        -- 예판

• Q&A: Common (but Deadly) MySQL Development Mistakes

  http://java.dzone.com/articles/qa-common-deadly-mysql

SQL

• The Read Committed Isolation Level - Paul White

  http://www.sqlperformance.com/2014/04/t-sql-queries/the-read-committed-isolation-level

• Cardinality Estimation for Disjunctive Predicates in SQL Server 2014 - Paul White

  http://sqlblog.com/blogs/paul_white/archive/2014/04/15/cardinality-estimation-for-disjunctive-predicates-in-2014.aspx

     

• SQL Server 2014 Buffer Pool Extensions

  http://www.brentozar.com/archive/2014/04/sql-server-2014-buffer-pool-extensions/

• A ever-increasing Clustered Key value doesn't scale!

  http://www.sqlpassion.at/archive/2014/04/15/an-ever-increasing-clustered-key-value-doesnt-scale

     

• Why is Affinity Mask Negative in sp_configure?

  http://www.pythian.com/blog/why-is-affinity-mask-negative-in-sp_configure/

     

• Searching for Strings in SQL Server Databases

  https://www.simple-talk.com/sql/t-sql-programming/searching-for-strings-in-sql-server-databases-/

     

• Simple-Talk SQL Server Backup Crib Sheet

  https://www.simple-talk.com/sql/backup-and-recovery/simple-talk-sql-server-backup-crib-sheet

     

• SQL intersection slides and samples

  http://www.sqlperformance.com/2014/04/sql-performance/sql-intersection-slides-and-samples

     

• [SQL Snacks Video] SQL Server Table Partitioning 102

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/15/sql-snacks-video-sql-server-table-partitioning-102.aspx

     

• FileTable?Adding a file to a folder

  http://voiceofthedba.wordpress.com/2014/04/16/filetableadding-a-file-to-a-folder/

     

• Optional Parameters Causing Index Scans

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/15/optional-parameters-causing-index-scans.aspx

     

• Parallel Data Warehouse (PDW) AU1 released

  http://www.toadworld.com/platforms/sql-server/b/weblog/archive/2014/04/15/parallel-data-warehouse-pdw-au1-released.aspx

     

LINKS

• LAST WEEKS TOP "READING" LINKS #79

  http://www.jasonstrate.com/2014/04/last-weeks-top-reading-links-79/

     

Other

• 왜 개발자들은 이전 개발자를 나쁜 사람으로 모는가?

  http://www.mimul.com/pebble/default/2014/04/16/1397645377481.html

     

• percona-millipede ? Sub-second replication monitor

  http://www.mysqlperformanceblog.com/2014/04/15/percona-millipede-sub-second-replication-monitor/