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Be Proactive: A Good DBA Goes Looking for Signs of Trouble | IDERA
1.
© 2019 IDERA,
Inc. All rights reserved. © 2021 IDERA, Inc. All rights reserved. BE PROACTIVE: GOOD DBA GOES LOOKING FOR SIGNS OF TROUBLE Database administrators (DBAs) are busier than ever these days, so fighting fires is last thing they want to spend their time doing. A proactive approach to database performance and maintenance helps keep DBAs ahead of trouble and prevent little problems from turning into full-blown emergencies.
2.
© 2021 IDERA,
Inc. All rights reserved. ROUTINE DATABASE MAINTENANCE • Most DBAs take full backups at regular intervals • DBAs also need to consider implications of backups concerning recovery • Backup frequency determines potential data loss from recovery
3.
© 2021 IDERA,
Inc. All rights reserved. ROUTINE DATABASE MAINTENANCE • Most DBAs take full backups at regular intervals • DBAs also need to consider implications of backups concerning recovery • Backup frequency determines potential data loss from recovery BACKUPS | RPO • Recovery point object (RPO): Maximum amount of data organization is willing to lose after recovery • RPO dictates backup schedule rather than other way around • Cost of achieving zero data loss is usually prohibitively high | Backup all Databases • Backup system databases as well as user databases • Without system database backups, new user databases will not have any agent jobs, logins, and permissions | Verification • Use CHECKSUM option during backup to perform corruption checks • Use RESTORE VERIFYONLY to ensure that backups are complete and readable without restoring database
4.
© 2021 IDERA,
Inc. All rights reserved. ROUTINE DATABASE MAINTENANCE • Most DBAs take full backups at regular intervals • DBAs also need to consider implications of backups concerning recovery • Backup frequency determines potential data loss from recovery BACKUPS | Backup Types • Full backup: Contains all data in database • Differential backup: Contains only data that has changed since last full backup - Recovery: Need to restore most recent full backup before recovery point, followed by most recent differential backup. • Log backup: Latest full backup plus all transactions that occurred since previous log backup. - Recovery: Restore log backups in chronological order to reach recovery point • Full copy only backup: Independent of regular backup sequence since it does not modify log sequence number (LSN)
5.
© 2021 IDERA,
Inc. All rights reserved. RECOVERY • Be prepared for database failures • Restore backups regularly • Determine time needed to retrieve backup files and restore backups including log files • Test restore scripts beforehand so they are ready for use
6.
© 2021 IDERA,
Inc. All rights reserved. INTEGRITY CHECKS • Some database servers like SQL Server allow backing up corrupt databases but it will not restore that backup • Try to run DBCC CHECKDB before every backup for full corruption check on entire database • However, CHECKDB is resource intensive • Frequency of integrity checks depends on amount of data organizations can afford to lose
7.
© 2021 IDERA,
Inc. All rights reserved. AGENT ALERTS • Set up alerting to provide notification when database failures occur • SQL Server agent sends notifications when it finds qualifying conditions • Database engine errors, resource errors, and corruption errors are important
8.
© 2021 IDERA,
Inc. All rights reserved. QUERY PERFORMANCE • Proper indexing is one of best performance enhancements you can make to your database • Database developers often use tools to create tables without knowing much about good database design • Look for highly-used, unused, fragmented, and missing indexes
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