https://alisvo.dev PostgreSQL, Oracle, MSSQL, Yüksek Erişilebilirlik ve Veritabanı Performans Optimizasyonu Rehberleri. tr-tr https://alisvo.dev/blog/veritabani-felaket-kurtarma-rpo-rto/ https://alisvo.dev/blog/veritabani-felaket-kurtarma-rpo-rto/ Fri, 28 Aug 2026 00:00:00 GMT Veri kaybına tahammülü olmayan kurumsal sistemlerde RPO ve RTO matematiği, PITR, WAL arşivleme, senkron replikasyon ve test edilmiş felaket kurtarma senaryoları. https://alisvo.dev/blog/postgresql-explain-analyze-optimizasyon/ https://alisvo.dev/blog/postgresql-explain-analyze-optimizasyon/ Thu, 20 Aug 2026 00:00:00 GMT Yavaş çalışan SQL sorgularını analiz etme, execution planları doğru okuma, Shared Buffers maliyetleri ve modern PostgreSQL index mimarileri üzerine kapsamlı DBA rehberi. https://alisvo.dev/blog/oracle-rman-azure-blob-quick-setup-guide/ https://alisvo.dev/blog/oracle-rman-azure-blob-quick-setup-guide/ Thu, 09 Oct 2025 00:00:00 GMT Oracle RMAN → Azure Blob Backup to Azure, the clean way Minimal steps, Oracle JDK only, and the recommended oracle.azure library alias. What you’ll need... https://alisvo.dev/blog/a-simple-script-for-starting-non-rac-oracle-databases-with-a-dg-configuration/ https://alisvo.dev/blog/a-simple-script-for-starting-non-rac-oracle-databases-with-a-dg-configuration/ Fri, 01 Aug 2025 00:00:00 GMT Oracle Auto-Startup via Cron Use one of these two options to have both your primary and standby databases come up automatically on reboot. Paste the entire... https://alisvo.dev/blog/postgresql-change-data-directory-in-the-service/ https://alisvo.dev/blog/postgresql-change-data-directory-in-the-service/ Mon, 14 Jul 2025 00:00:00 GMT Systemd ile yönetilen PostgreSQL servislerinde veri dizinini (data directory) güvenli bir şekilde farklı bir diske veya dizine taşıma. https://alisvo.dev/blog/postgresql-maintenance-cheat-sheet/ https://alisvo.dev/blog/postgresql-maintenance-cheat-sheet/ Mon, 14 Jul 2025 00:00:00 GMT PostgreSQL DBA'leri için VACUUM, ANALYZE, REINDEX ve tablo şişmesi (bloat) yönetimini içeren hızlı başvuru rehberi. https://alisvo.dev/blog/postgresql-restore-command-reference/ https://alisvo.dev/blog/postgresql-restore-command-reference/ Mon, 14 Jul 2025 00:00:00 GMT PostgreSQL Restore Commands Reference This guide covers the three primary methods to restore PostgreSQL data: using psql for plain‐text dumps, pg_restore... https://alisvo.dev/blog/some-postgresql-backup-commands-reference/ https://alisvo.dev/blog/some-postgresql-backup-commands-reference/ Mon, 14 Jul 2025 00:00:00 GMT PostgreSQL pg_dump, pg_dumpall ve pg_restore komutları ile şema, tablo ve veri yedekleme pratik komut referansı. https://alisvo.dev/blog/pgbackrest-restore-scenario/ https://alisvo.dev/blog/pgbackrest-restore-scenario/ Sat, 31 May 2025 00:00:00 GMT Rescuing a Dropped PostgreSQL Database: Two pgBackRest Paths to Success That sinking feeling when a DROP DATABASE command slips through... we've all been... https://alisvo.dev/blog/postgresql-cluster-commands/ https://alisvo.dev/blog/postgresql-cluster-commands/ Fri, 09 May 2025 00:00:00 GMT PostgreSQL Cluster Control Cheat-Sheet 1 · What Exactly Is a “Cluster”? In PostgreSQL terminology, a cluster is a self-contained instance: one data... https://alisvo.dev/blog/postgresql-config-file-parameters/ https://alisvo.dev/blog/postgresql-config-file-parameters/ Fri, 09 May 2025 00:00:00 GMT PostgreSQL 16 Server Configuration & Tuning Cheatsheet 1 · Parameter Fundamentals Case-insensitive names. Value types: boolean · integer · float · string ·... https://alisvo.dev/blog/postgresql-data-dictionaries-functions/ https://alisvo.dev/blog/postgresql-data-dictionaries-functions/ Fri, 09 May 2025 00:00:00 GMT PostgreSQL 16 Data Dictionary & Catalog Cheat-Sheet PostgreSQL ships with a rich “data dictionary” — a collection of catalog tables , views and utility... https://alisvo.dev/blog/error-when-installing-some-postgresql-packages-perl-ipc-run/ https://alisvo.dev/blog/error-when-installing-some-postgresql-packages-perl-ipc-run/ Thu, 08 May 2025 00:00:00 GMT Fixing perl(IPC::Run) Dependency Error When Installing PostgreSQL 17 on Oracle Linux 8 Background While preparing a fresh Oracle Linux 8 server for a... https://alisvo.dev/blog/psql-commands/ https://alisvo.dev/blog/psql-commands/ Thu, 08 May 2025 00:00:00 GMT psql Cheat-Sheet & Power User Guide 1 · Startup Sequence Environment – PGHOST , PGPORT , PGUSER , PGDATABASE are honoured. User profile – reads... https://alisvo.dev/blog/postgresql-architecture-basic-info/ https://alisvo.dev/blog/postgresql-architecture-basic-info/ Wed, 07 May 2025 00:00:00 GMT PostgreSQL Reference Guide General Database Limits Maximum Database Size: Unlimited Maximum Table Size: 32 TB Maximum Row Size: 1.6 TB Maximum Field Size: 1... https://alisvo.dev/blog/postgresql-example-setup-red-hat-linux-major-ver-16/ https://alisvo.dev/blog/postgresql-example-setup-red-hat-linux-major-ver-16/ Wed, 07 May 2025 00:00:00 GMT PostgreSQL 16 Enterprise‑Grade Installation Guide RHEL 8/9 Edition 1 · Preparation Checklist 64‑bit RHEL 8/9 minimal install, fully patched. Dedicated LVM... https://alisvo.dev/blog/oracle-19c-dataguard-installation-with-dg-broker/ https://alisvo.dev/blog/oracle-19c-dataguard-installation-with-dg-broker/ Sun, 04 May 2025 00:00:00 GMT Oracle 19c Physical Standby Creation & Management (RMAN Duplicate + Data Guard Broker) This article walks through building a physical standby using RMAN... https://alisvo.dev/blog/rman-duplicate-to-another-server-with-different-sid/ https://alisvo.dev/blog/rman-duplicate-to-another-server-with-different-sid/ Tue, 29 Apr 2025 00:00:00 GMT Cloning MYDBPROD → MYDBTEST with RMAN DUPLICATE Sometimes we need a quick, up‑to‑date copy of production for troubleshooting or functional testing. The... https://alisvo.dev/blog/moving-oracle-datafiles-and-log-files-in-windows-server/ https://alisvo.dev/blog/moving-oracle-datafiles-and-log-files-in-windows-server/ Tue, 22 Apr 2025 00:00:00 GMT Consolidating Oracle 19c Datafiles & Redo Logs onto a Single Drive Contents 0 · Executive Summary 1 · Pre‑Start Requirements 2 · Inventory & Duplicate‑Name... https://alisvo.dev/blog/script-to-export/ https://alisvo.dev/blog/script-to-export/ Fri, 14 Feb 2025 00:00:00 GMT Oracle expdp Export Job Script This bash script runs an Oracle Data Pump export (expdp) job with anonymized parameters (except the expdp binary path).... https://alisvo.dev/blog/sql-server-basic-healthcheck-queries/ https://alisvo.dev/blog/sql-server-basic-healthcheck-queries/ Mon, 10 Feb 2025 00:00:00 GMT This guide provides a suite of T‑SQL queries that give you a quick snapshot of your SQL Server’s health. The toolkit covers: Database Health Status Top 5... https://alisvo.dev/blog/unlock-oracle-users-and-make-their-password-unexpirable/ https://alisvo.dev/blog/unlock-oracle-users-and-make-their-password-unexpirable/ Fri, 07 Feb 2025 00:00:00 GMT When an Oracle database user account expires, it needs to be unlocked and assigned to a profile that ensures password expiration does not occur. Follow... https://alisvo.dev/blog/how-to-move-datafiles-in-oracle-11gr2/ https://alisvo.dev/blog/how-to-move-datafiles-in-oracle-11gr2/ Mon, 03 Feb 2025 00:00:00 GMT Oracle 11gR2 üzerinde kullanıcı veya sistem veri kütüklerini (datafiles) kontrol dosyası ile senkron şekilde yeni bir dizine taşıma rehberi. https://alisvo.dev/blog/practical-rman-restore-scenario-for-linux-on-different-server/ https://alisvo.dev/blog/practical-rman-restore-scenario-for-linux-on-different-server/ Fri, 31 Jan 2025 00:00:00 GMT Practical RMAN Restore Guide This guide shows how to restore and relocate an Oracle database via RMAN. We’ll assume you want all datafiles in a new folder (... https://alisvo.dev/blog/running-sqlcmd-in-powershell-via-sql-server-agent/ https://alisvo.dev/blog/running-sqlcmd-in-powershell-via-sql-server-agent/ Wed, 29 Jan 2025 00:00:00 GMT Learn how to execute a SQL query via SQL Server Agent using PowerShell and sqlcmd . This method ensures UTF-8 compatibility and proper handling of... https://alisvo.dev/blog/creating-jobs-with-different-users-via-pgcron-in-azure-postgresql-flexible-server/ https://alisvo.dev/blog/creating-jobs-with-different-users-via-pgcron-in-azure-postgresql-flexible-server/ Tue, 21 Jan 2025 00:00:00 GMT PostgreSQL pg_cron: Scheduling Materialized View Refresh Across Databases In this tutorial, I’ll walk you through the process of scheduling a Materialized... https://alisvo.dev/blog/sysaux-tablespace-filling-cause-wriadvtasks-filled-with-autostatsadvisortask/ https://alisvo.dev/blog/sysaux-tablespace-filling-cause-wriadvtasks-filled-with-autostatsadvisortask/ Wed, 18 Dec 2024 00:00:00 GMT The SYSAUX tablespace might fill up with records from advisor tasks. Use the following steps to identify and resolve the issue. Step 1: Check SYSAUX Usage... https://alisvo.dev/blog/oracle-19c-failover-steps/ https://alisvo.dev/blog/oracle-19c-failover-steps/ Mon, 11 Nov 2024 00:00:00 GMT Oracle 19c Data Guard ortamlarında felaket anında standby veritabanını primary moda geçirme (Failover) operasyon adımları. https://alisvo.dev/blog/oracle-database-19c-switchover-steps/ https://alisvo.dev/blog/oracle-database-19c-switchover-steps/ Mon, 11 Nov 2024 00:00:00 GMT Oracle 19c Data Guard mimarisinde planlı bakım ve veri merkezi geçişleri için sıfır veri kayıplı Switchover rehberi. https://alisvo.dev/blog/adjusting-sga-pga-in-oracle-databases/ https://alisvo.dev/blog/adjusting-sga-pga-in-oracle-databases/ Thu, 07 Nov 2024 00:00:00 GMT Oracle veritabanlarında memory_target, SGA ve PGA bellek parametrelerinin incelenmesi ve dinamik olarak ayarlanması adımları. https://alisvo.dev/blog/audit-table-cleaning/ https://alisvo.dev/blog/audit-table-cleaning/ Thu, 07 Nov 2024 00:00:00 GMT 1. Identify Large Segments in the SYSTEM Tablespace Before deleting records, you may want to identify which segments occupy the most space in the SYSTEM... https://alisvo.dev/blog/quick-reconfiguration-of-a-corrupted-standby-database-in-oracle-data-guard/ https://alisvo.dev/blog/quick-reconfiguration-of-a-corrupted-standby-database-in-oracle-data-guard/ Thu, 07 Nov 2024 00:00:00 GMT The following steps can be used to quickly reconfigure a corrupted standby database in Oracle Data Guard. These steps assume the configurations are already... https://alisvo.dev/blog/partitioning-existing-table-in-postgresql/ https://alisvo.dev/blog/partitioning-existing-table-in-postgresql/ Tue, 03 Sep 2024 00:00:00 GMT How to partition an existing large table in PostgreSQL with range partitioning, automated partition creation, and indexing. https://alisvo.dev/blog/finding-user-objects-with-tablespaces-in-oracle-database/ https://alisvo.dev/blog/finding-user-objects-with-tablespaces-in-oracle-database/ Wed, 26 Jun 2024 00:00:00 GMT The query below shows what tablespaces does user have files and what are the total sizes of their objects in there. https://alisvo.dev/blog/remove-expire-without-changing-password-on-a-user-in-oracle-database/ https://alisvo.dev/blog/remove-expire-without-changing-password-on-a-user-in-oracle-database/ Tue, 04 Jun 2024 00:00:00 GMT How to reset or unexpire an Oracle database user password without knowing or changing the current password. https://alisvo.dev/blog/oracle-19c-client-silent-setup-on-red-hat-linux/ https://alisvo.dev/blog/oracle-19c-client-silent-setup-on-red-hat-linux/ Tue, 02 Apr 2024 00:00:00 GMT To install the Oracle Database Client with the necessary patches, follow the steps below: 1. Install Pre-requisite RPM You might need to install some... https://alisvo.dev/blog/backup-recovery-scenarios/ https://alisvo.dev/blog/backup-recovery-scenarios/ Sun, 17 Mar 2024 00:00:00 GMT Common Oracle RMAN backup and disaster recovery scenarios: compressed full backup, missing datafiles, and lost control files. https://alisvo.dev/blog/oracle-dataguard-recovery-steps-status-check/ https://alisvo.dev/blog/oracle-dataguard-recovery-steps-status-check/ Tue, 27 Feb 2024 00:00:00 GMT Steps and status checking queries to recover disconnected and unrecoverable standby databases in Oracle Data Guard. https://alisvo.dev/blog/oracle-database-gateway-setup-on-linux-for-mssql-connections/ https://alisvo.dev/blog/oracle-database-gateway-setup-on-linux-for-mssql-connections/ Fri, 02 Feb 2024 00:00:00 GMT Step-by-step setup and configuration guide for Oracle Database Gateway for SQL Server (dg4msql) on Linux. https://alisvo.dev/blog/scheduling-one-time-jobs-for-linux/ https://alisvo.dev/blog/scheduling-one-time-jobs-for-linux/ Mon, 15 Jan 2024 00:00:00 GMT Using the at Command for Scheduled Maintenance We may need some maintenance works for our database systems. If we don't want to spend our evening with all... https://alisvo.dev/blog/how-to-create-streaming-replication-in-postgresql-in-linux/ https://alisvo.dev/blog/how-to-create-streaming-replication-in-postgresql-in-linux/ Fri, 22 Dec 2023 00:00:00 GMT A step-by-step guide to setting up streaming replication in PostgreSQL on Linux servers, including configuration, backup automation, and replication monitoring. https://alisvo.dev/blog/running-python-functions-like-a-batch-program/ https://alisvo.dev/blog/running-python-functions-like-a-batch-program/ Wed, 04 Oct 2023 00:00:00 GMT How to automate batch procedures in Python by orchestrating functions with argument tuples in a loop. https://alisvo.dev/blog/restore-single-database-from-backup-files-which-are-taken-by-pgdumpall/ https://alisvo.dev/blog/restore-single-database-from-backup-files-which-are-taken-by-pgdumpall/ Fri, 15 Sep 2023 00:00:00 GMT Normally, you can't restore a single database from a cluster backup that are taken via pg_dumpall.In order to achieve that, you can follow the steps below:... https://alisvo.dev/blog/how-to-createexecutedrop-tuning-tasks/ https://alisvo.dev/blog/how-to-createexecutedrop-tuning-tasks/ Thu, 24 Aug 2023 00:00:00 GMT Oracle SQL Tuning Advisor (STA) ile sorgu optimizasyon görevleri oluşturma, çalıştırma ve silme adımları. https://alisvo.dev/blog/some-oracle-query-optimization-tips/ https://alisvo.dev/blog/some-oracle-query-optimization-tips/ Wed, 14 Jun 2023 00:00:00 GMT Practical query optimization tips for Oracle Database, including REGEXP_LIKE and table collection functions. https://alisvo.dev/blog/ora-00980-synonym-translation-is-not-valid/ https://alisvo.dev/blog/ora-00980-synonym-translation-is-not-valid/ Fri, 26 May 2023 00:00:00 GMT Sometimes if the base object of a synonym is dropped without dropping the synonym, ORA-00980 error may occur. Here is how to detect broken synonyms. https://alisvo.dev/blog/warn-yourself-when-your-linux-server-isnt-restarted-for-a-while-after-an-update/ https://alisvo.dev/blog/warn-yourself-when-your-linux-server-isnt-restarted-for-a-while-after-an-update/ Tue, 20 Dec 2022 00:00:00 GMT A Python script for RHEL, CentOS, and Oracle Enterprise Linux to alert administrators when a newly installed kernel hasn't been activated by a reboot. https://alisvo.dev/blog/streaming-replication-without-archiving-linux/ https://alisvo.dev/blog/streaming-replication-without-archiving-linux/ Thu, 29 Sep 2022 00:00:00 GMT Initial Steps Summary Let’s sum up the initial steps, then dive into key points: Ensure that the primary and replica servers have proper firewall... https://alisvo.dev/blog/checking-old-versions-of-tables-via-oracle-database-flashback-queries/ https://alisvo.dev/blog/checking-old-versions-of-tables-via-oracle-database-flashback-queries/ Mon, 22 Aug 2022 00:00:00 GMT Sometimes in production servers, you might need to check specific record(s) in order get older versions. Oracle has Flashback technology to revert your... https://alisvo.dev/blog/creating-a-script-that-fixes-unusable-indexes/ https://alisvo.dev/blog/creating-a-script-that-fixes-unusable-indexes/ Mon, 22 Aug 2022 00:00:00 GMT Oracle veritabanında UNUSABLE durumdaki indeksleri tespit eden ve otomatik olarak REBUILD eden pratik SQL scripti. https://alisvo.dev/blog/postgresql-password-file/ https://alisvo.dev/blog/postgresql-password-file/ Tue, 14 Jun 2022 00:00:00 GMT When we need to connect somewhere via cron job, batch script etc. , .pgpass file can be really useful for authorization. Connection information is saved... https://alisvo.dev/blog/run-scripts-in-the-background-via-nohup/ https://alisvo.dev/blog/run-scripts-in-the-background-via-nohup/ Fri, 10 Jun 2022 00:00:00 GMT How to run long-running shell scripts in the background and redirect output to a log file using nohup and disown. https://alisvo.dev/blog/how-to-find-similar-records-in-oraclepostgresql-database/ https://alisvo.dev/blog/how-to-find-similar-records-in-oraclepostgresql-database/ Wed, 25 May 2022 00:00:00 GMT Sometimes we may need to find some similar data (not exact one) regarding to our needs. For example, one digit of the phone number may have been registered... https://alisvo.dev/blog/returning-multiple-hard-coded-rows-in-oracle-database/ https://alisvo.dev/blog/returning-multiple-hard-coded-rows-in-oracle-database/ Wed, 25 May 2022 00:00:00 GMT Sometimes dummy and hard-coded vales might be needed for testing or some other purposes. We can return single rows easily with 'select ...... from dual'.... https://alisvo.dev/blog/finding-long-running-queries-in-oracle-database/ https://alisvo.dev/blog/finding-long-running-queries-in-oracle-database/ Thu, 28 Apr 2022 00:00:00 GMT It could be tricky to detect when your database slows down for no reason. At first, you should check system resources (CPU - RAM usage, network etc.) and if... https://alisvo.dev/blog/faster-way-to-dump-and-restore-in-postgres/ https://alisvo.dev/blog/faster-way-to-dump-and-restore-in-postgres/ Fri, 22 Apr 2022 00:00:00 GMT In general, people find dumping their whole databases in sever by pg_dumpall easily. But it takes too long since this tool is not utilized for using... https://alisvo.dev/blog/compressing-decompressing-backup-files-with-pigz/ https://alisvo.dev/blog/compressing-decompressing-backup-files-with-pigz/ Wed, 20 Apr 2022 00:00:00 GMT 1. Check Required Packages Ensure the yum packages openssl and pigz are installed on your system. 2. Compress and Encrypt Files Use the following command to... https://alisvo.dev/blog/virtual-ip-configuration-for-postgresql-oel8/ https://alisvo.dev/blog/virtual-ip-configuration-for-postgresql-oel8/ Wed, 09 Mar 2022 00:00:00 GMT Step-by-step guide for configuring a virtual IP (VIP) for PostgreSQL on Oracle Enterprise Linux 8 (OEL8). https://alisvo.dev/blog/oracle-database-upgrade-with-opatch-tool-rhelcentosoel/ https://alisvo.dev/blog/oracle-database-upgrade-with-opatch-tool-rhelcentosoel/ Mon, 14 Feb 2022 00:00:00 GMT Follow these steps to upgrade an Oracle Database using the OPatch tool: 1. Download and Prepare Files Download the patch you want to install along with the... https://alisvo.dev/blog/upgrading-password-encryption-from-md5-to-scram-sha-256-in-a-postgresql-database/ https://alisvo.dev/blog/upgrading-password-encryption-from-md5-to-scram-sha-256-in-a-postgresql-database/ Mon, 14 Feb 2022 00:00:00 GMT How to migrate PostgreSQL database password authentication from MD5 to SCRAM-SHA-256 securely. https://alisvo.dev/blog/postgresql-upgrade-with-pgupgrade-utility-in-rhelcentosoel/ https://alisvo.dev/blog/postgresql-upgrade-with-pgupgrade-utility-in-rhelcentosoel/ Sat, 12 Feb 2022 00:00:00 GMT Upgrading PostgreSQL can be a smooth process if you follow the necessary steps carefully. Below is a comprehensive guide to help you through the upgrade....