DBMS Log-Based Recovery MCQs: This section contains multiple-choice questions and answers on Log-Based Recovery in DBMS. Submitted byAnushree Goswami, on April 18, 2022 1. Logs consist of a ___ of records. Compilations Series Data Table ...
We have developed log-based recovery for middleware servers that access back-end transaction systems (DBMSs). Transactional consistency is provided between in-memory state stored in middleware servers and persistent state stored in transaction systems. A new logging method called results logging is expl...
[algorithmENCRYPTKEY {key_name| DEFAULT}] [SYSDBA]] Valid for Extract in integrated capture mode for Oracle. Specifies login credentials for Extract to log in to a downstream Oracle mining database to interact with the logmining server. Can be used instead of theMININGUSERALIASoption if an Or...
Sets the interval, in seconds, after which Extract times out ifv$database.current_scnhas not moved past the commit SCN associated with the record for which it needs to process. The default is 30 seconds. The minimum is 5 and the maximum is 2147483646. Supports Extract in classic capture m...
The DBMS comprises a database mainline system, a backup utility and a restore utility. The data and log records are stored on separate storage volumes. Log records are written to identify objects that require special handling during the point-in-time recovery. The database engine operates ...
The log-structured mergetree (LSM-tree) is a disk-based data structure designed to provide low-cost indexing for a file experiencing a high rate of record inserts (and deletes) over an extended period. The LSM-tree uses an algorithm that defers and batches index changes, cascading the ...
目前市场上的DBMS主要有两种不同的WAL磁盘存储方案:1. 环绕覆盖Rewind 2.创建回收Recycle。 RedoLog File环绕覆盖写机制一般对应用户可配置两个参数:para1. 日志文件个数;para2. 单个日志文件大小。环绕写会根据Checkpoint创建时机,标记可清理的旧日志数据位置,即:在这部分空间中DBMS产生的新日志数据覆盖掉旧数据。这...
Decrypt Password using MD5 algorithm in sql server Decrypt the encrypted store procedure through the T-SQL programming in SQL Server 2005 Decrypt the hashed password in SQL Server 2008 DECRYPTBYPASSPHRASE sometimes returns NULL for the same input and passphrase. Default DATE and uniqueidentifier...
As a SQL Server DBA, Postgres Backups Surprised Me.August 12, 2024In "Backup and Recovery" 66Comments.Leave new "*" indicates required fields Name* FirstLast Email* Things I want* First Responder Kit (Scripts and Guides) Monday Links (SQL & tech news) ...
such need to prove this because the 10g and above mechanism is not encryption as such (ok very weak) and it just puts the original code back. The only real advantage of 10g and 11g wrapping over 9i and lower is that the symbol table is no longer visible but the algorithm is much ...