Tag: oratidbit

“Oracle *daily* TidBits” (#oratidbit) published on Facebook &Twitter, during weekdays in December 2019. December Tidbits are a repeat of the popular tidbits from 2019. I hope you find these helpful to learn something new or to remind you of its existence and use.

#OraTidbit DBA_AUTO_STAT_EXECUTIONS view in #db19c displays information about automatic optimizer statistics collection tasks, which are executed by the automated maintenance tasks infrastructure (known as AutoTask).

#oratidbit The CLUSTER_DATABASE_INSTANCES parameter is deprecated in #db19c. Starting with Oracle Database release 19c, version 19.1, the number of configurable Oracle RAC instances is derived from Oracle Clusterware.

#OraTidbit #ThinkAutonomous Though there is no Operating System access, you can create directories in Oracle Autonomous Database (ADW/ATP). CREATE DIRECTORY command creates the necessary directories and sub-directories on the OS side for you.

#OraTidbit #ThinkAutonomous Autonomous Database (ADW/ATP) allows user directories. Since there is no OS access to ATP/ADW machines, use DBMS_CLOUD.LIST_FILES function to list files in a directory. Use DBMS_CLOUD.DELETE_FILE function to remove a file.

#OraTidbit ORAchk/EXAchk -autostart will perform compliance checks for the most severe problems at 2 am daily, and all known problems once a week at 3 am on a Sunday.

#OraTidbit Init parameter ADG_ACCOUNT_INFO_TRACKING controls login attempts of users on Oracle Active Data Guard standby databases. Value GLOBAL maintains a single global copy of users’ account information across all databases (primary and standby).

#OraTidbit ORAchk, EXAchk and Trace File Analyzer (TFA) are now combined into a single installer called Autonomous Health Framework (AHF 19.3). There is no change to the command-line tools. Use Oracle Support Doc ID 2550798.1 to download AHF.

#OraTidbit Oracle Database Personal Edition includes all of the Enterprise Edition components except Oracle RAC. Oracle PE is available on Linux and Windows platforms only and Oracle management packs cannot be used.

#oratidbit #OracleASM You can upgrade Oracle ASM 11g 11.2 and later without shutting down an Oracle RAC database by performing a rolling upgrade either of individual nodes or of a set of nodes in the cluster.

#oratidbit Oracle Data Pump in #db19c has a new transform parameter OMIT_ENCRYPTION_CLAUSE that causes Data Pump to suppress any encryption clauses associated with objects using encrypted columns.

#OraTidbit #DB19c For Enterprise and Standard editions of Oracle database, if you are not licensed for Oracle Multitenant, then you may have up to 3 PDBs in a given container database at any time.

#oratidbit Using Fleet Patching and Provisioning to patch Oracle Restart automates and standardizes the processes that are implemented in Oracle RAC database installations. It also reduces operational demands and risks, especially for large numbers of Oracle Restart deployments.

#oratidbit DBA_AUTO_INDEX_CONFIG displays the current configuration parameter settings for automatic indexing in #db19c. Set automatic indexing configuration parameters by using the DBMS_AUTO_INDEX.CONFIGURE procedure.

#OraTidbit #DB19c In Oracle Database 19c, you can create a duplicate of an Oracle Database by using the createDuplicateDB command of Database Configuration Assistant (DBCA) in silent mode.

#oratidbit Enable deferred insert (#db19c feature) for a table by using the MEMOPTIMIZE FOR WRITE clause in ALTER TABLE or CREATE TABLE. Initiate deferred insert using the /*+ MEMOPTIMIZE_WRITE */ hint in the INSERT statement.

#OraTidbit #OrclDB Global Data Services is a highly effective solution for automatic workload management across a set of replicated databases. Data Guard, GoldenGate, or any replication technology, can be used to sync the databases. Requires the Oracle Active Data Guard license.

#OraTidbit The I/O calibration feature of #OrclDB is using the DBMS_RESOURCE_MANAGER.CALIBRATE_IO procedure- issues random I/O intensive read-only I/Os to the database files to determine the maximum IOPS and MBPS that can be sustained by the storage subsystem.

#oratidbit #OracleRAC Starting with Oracle Grid Infrastructure 19c, the Grid Infrastructure Management Repository (GIMR) is optional for new installations of Oracle Standalone Cluster. Reduces functionality in CHAG, CHACTL, TFA.

#OraTidbit Starting with Oracle Database Release 19c, invalidated PL/SQL objects run on Active Data Guard standby database can be automatically recompiled by setting the ADG_REDIRECT_DML initialization parameter to TRUE.

#OraTidbit #DB19c Real-Time Statistics feature is when a DML operation is currently modifying a table, Oracle Database dynamically computes values for the most essential statistics. The NO_GATHER_OPTIMIZER_STATISTICS hint prevents the collection of real-time statistics.

“Oracle *daily* TidBits” (#oratidbit) published on Facebook &Twitter, during weekdays in November 2019. I hope you find these helpful to learn something new or to remind you of its existence and use.

#OraTidbit Init parameter ADG_ACCOUNT_INFO_TRACKING controls login attempts of users on Oracle Active Data Guard standby databases. Value GLOBAL maintains a single global copy of users’ account information across all databases (primary and standby). Login failures across all databases count towards the maximum count and logins anywhere will be denied when the count is reached.

#OraTidbit Oracle Database Personal Edition includes all of the Enterprise Edition components except Oracle RAC. Oracle PE is available on Linux and Windows platforms only and Oracle management packs cannot be used.

#OraTidbit #DB19c If you are not licensed for Oracle Multitenant, you may have up to 3 user-created PDBs in a container database. If you are licensed for Oracle Multitenant, you can create up to 252 PDBs on non-Exadata Enterprise Edition platforms, and 4096 PDBs on Exadata.

#OraTidbit Many #OrclDB performance features are available only on Exadata – Automatic Indexing, SQL Quarantine, Real-time statistics, High-frequency automatic optimizer statistics collection, In-Memory Column Store support for External Tables, MemOptimized Row Store, etc.

#OraTidbit Oracle Enterprise Edition security options such as Column-level encryption, Tablespace encryption, and redaction are available with the Advanced Security Option.

#OraTidbit The Oracle TimesTen Application-Tier Database Cache (TimesTen Cache) is a Database option for caching subsets of the database in the application tier. TimesTen Cache is included in Oracle Database Personal Edition.

#OraTidbit #AWS #OracleRDS Amazon RDS supports Oracle Database versions 19c (19.0.0), 18c (18.0.0) & 12c (12.2.0.1 and 12.1.0.2). You can not create DB instances that use Oracle version 11.2.0.2 or lower.

#OraTidbit #AWS #OracleRDS There are two licensing options available on Amazon RDS: License Included and Bring Your Own License (BYOL). The License Included model is supported for Oracle Database Standard Edition One & Two (SE1 & SE2).

#OraTidbit #AWS #OracleRDS Amazon RDS supports Multi-AZ deployments for Oracle as a high-availability, failover solution. If you use the Bring Your Own License model, you must have a license for both the primary DB instance and the standby DB instance in a Multi-AZ deployment.

#OraTidbit #AWS #OracleRDS Several privileges are not available for the DBA role on an Amazon RDS DB instance – Alter database, Alter system, Create any directory, Drop any directory, Grant any privilege, Grant any role.

#OraTidbit #OracleCloud #OrclDB For 1-node virtual machine DB systems, Oracle Cloud Infrastructure provides a “fast provisioning” option to create a DB system using Logical Volume Manager (LVM) as your storage management software instead of Automatic Storage Management (ASM).

#OraTidbit #OracleCloud #OrclDB Oracle Cloud Infrastructure offers 1-node DB systems on either bare metal or virtual machines and 2-node RAC DB systems on virtual machines. Bare metal DB systems have locally attached NVMe storage. VM DB system uses OCI block storage.

#OraTidbit Oracle database automatic block repair feature: the primary database automatically attempts to repair the corrupted block in real-time by fetching a good version of the same block from a physical standby database as soon as the corruption is detected. Requires the Oracle Active Data Guard option.

#OraTidbit #OrclDB Global Data Services is a highly effective solution for automatic workload management across a set of replicated databases. Oracle Data Guard, Oracle GoldenGate, or any other database replication technology, can be used to synchronize the databases. Requires the Oracle Active Data Guard license.

#OraTidbit #OrclDB Heat Map tracks data access and modification. Provides data access tracking at the segment-level and data modification tracking at the segment and row level. Enable with the HEAT_MAP initialization parameter. Requires the Oracle Advanced Compression option or the Oracle Database In-Memory option.

#OraTidbit Implement ILM strategy using the Automatic Data Optimization (ADO) feature – automate the compression and movement of data between different tiers of storage within the database. Requires the Oracle Advanced Compression option or the Oracle Database In-Memory option.

#OraTidbit Enabling block change tracking (BCT) facilitates fast incremental backups. Using BCT for Fast Incremental Backup on Physical Standby requires Oracle Active Data Guard option.

#OraTidbit ORAchk, EXAchk and Trace File Analyzer (TFA) are now combined into a single installer called Autonomous Health Framework (AHF 19.3). There is no change to the command-line tools. Use Oracle Support Doc ID 2550798.1 to download AHF.

#OraTidbit Install the Autonomous Health Framework (AHF) using command “ahf_setup”. TFA will be automatically started after install. ORAchk or EXAchk can be can be started to run automatic compliance check “orachk|exachk -autostart”.

#OraTidbit ORAchk/EXAchk -autostart will perform compliance checks for the most severe problems at 2am, once a day; and all known problems once a week at 3am on a Sunday.

#OraTidbit Certain ORAchk and EXAchk checks have the capability to automatically fix problems when found. Use “orachk -showrepair {check_id}” to see what the repair command actually does.

#OraTidbit ORAchk and EXAchk are integrated with Database AutoUpgrade & Cluster Verification Utility (CVU). They run ORAchk & EXAchk in -preupgrade mode.