While Oracle Database can combine B-trees (via a "bitmap conversion from rowids"), this is relatively expensive. In general to get the same performance as the three bitmaps, you need to place all three columns in a single index. This affects how reusable an index is, which we'll come...
Database log mode Archive Mode Automatic archival Enabled Archive destination /dbaclass06/arch Oldest online log sequence 25626 Next log sequence to archive 25628 Current log sequence 25628 SQL> select destination,STATUS from v$archive_dest where statuS='VALID'; DESTINATION STATUS --- --- /dbaclas...
Some tables can have many unique identifiers. A common reason for this is surrogate keys – sequence assigned or GUID values that have no meaning outside of the application. For example you may add anaccount_idcolumn to theaccountstable: Copy code snippet Copied to Clipboard Error: Could not ...
Edition-based redefinition in Oracle Database 11gR2//12c/18c/19c allows multiple versions of PL/SQL objects, views, and synonyms in a single schema, which makes it possible to perform upgrades of database applications with zero downtime. It also means we can maintain multiple copies of the ...
some differences may exist. As a preliminary setup before we learn how to add a column to table, install Toad for Oracle, create an instance of Oracle Autonomous Database 19c (or other) and connect to the database instance, all of which is discussed inHow to download Toad for Oracle. ...
Oracle Database Administrator's Guidefor information on long-running queries and resumable space allocation For example, ifUNDO_RETENTIONis set to 30 minutes, then all committed undo information in the system is retained for at least 30 minutes. This ensures that all queries running for 30 minutes...
Another useful switch is--destructive, which causes the initial user account home directory to be destroyed. The default is to leave it in place. Configuring an Oracle Solaris 11 System The configuration sequence is similar in the following scenarios: ...
1. How to check the consistency the backup , why i am can not see my table ? 2. How to set NBU script when in one box solaris have 3 instance oracle ? for example each instance different oracle home and password and user the oracle owner ...
#1) Data Mapping In software systems, data often travels back and forth from the UI (user interface) to the backend DB and vice versa. So these are some aspects to watch for: Check whether the fields in the UI/frontend forms are mapped consistently with the corresponding fields in the DB...
[A]MySQL.Data.MySqlClient.MySqlConnection cannot be cast to [B]MySQL.Data.MySqlClient.MySqlConnection. [C#] How to make the Console Process delay [C#] Oracle.DataAccess issue - Unhandled exception of type System.TypeInitializationException occured in mscorlib.dll [C#] Regex - Best Validation of...