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Write down for Segments, Extents, and Blocks
Segments, Extents, and Blocks(段、区、块) • Segments exist in a tablespace. • Segments are collections of extents. • Extents are collections of data/undo blocks. 8k • Data/undo blocks are mapped to disk blocks. 引用下官方的关系图Where is the implementation of pixman_region32_init()?
https://stackoverflow.com/questions/48434760/where-is-the-implementation-of-pixman-region32-init It's in pixman-region32.c. You don't see it because those functions are generated by the PREFIX macro and then the code in pixman-region.c is used.Unity Bounds 边界框（包围盒）
Represents an axis aligned bounding box. 表示一个轴对齐的边界框。 An axis-aligned bounding box, or AABB for short, is a box aligned with coordinate axes and fully enclosing some object. Because the box is never rotated with r如何对表手工扩展一个extent或多个extent
如何对表手工扩展一个extent或多个extent用alter table allocate extent 命令来实现SQL> show userUSER is "SYS"SQL> create table test_extent(a number,b varchar2(10)); ===============> table createdTable created.SQL> select OWNER,SEGMENT_NAME,SEGMENTlinux 逻辑卷扩容
扩容[root@localhost lohr]# lvextend -L +2G /dev/thomas/thomas-lv Size of logical volume thomas/thomas-lv changed from 1.00 GiB (256 extents) to 3.00 GiB (768 extents). Logical volume thomas/thomas-lv successfully resized.生效[root@localhost lohr]# resizeMaster Note: Undo 空间使用率高 (Doc ID 1578639.1)
Master Note: High Undo Space Usage (Doc ID 1578639.1) APPLIES TO: Oracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Cloud Machine - Version N/A and laterOracle Cloud Infrastructure - Database Service - Version N/A and latTroubleshooting ORA-30036 - Unable To Extend Undo Tablespace (Doc ID 460481.1)
Troubleshooting ORA-30036 - Unable To Extend Undo Tablespace (Doc ID 460481.1) APPLIES TO: Oracle Database - Enterprise Edition - Version 9.2.0.1 to 11.2.0.2 [Release 9.2 to 11.2]Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [ReleaseOracle commonly uesd tables/views and processes（二）
一、oracle commonly table1、dba_extents #describes the extents comprising the segments in all tablespaces in the database.commonly columnowner segment_namepartition_nametablespace_nameblocksbytes 2、dba_segments#describes the storage allocated for all segmentlatch - undo global data等待事件分析
一环境跑压力测试的时候，标题所述等待事件在top N中。不用查，也知道是因为undo竞争的事件。 根据metalink文档解释，是由于undo表空间不足引起的。 This implies that sessions are struggling to find new undo extents and are having to steal. "ktusm_stealext_2" is used to stea