GROUP BY操作是数据库中非常常见的语法,通常用于聚合函数的聚合操作。对于oracle最早的时候对于group by还是使用的Sort Group Aggregate,之后引入了一种对于大数据量group by较为高效的算法Hash Group Aggregate。
ACD Active Change Directory AMDU ASM asm disk ASM恢复 asm文件 asm磁盘头 AT bbed block prefetch CBO COD Continuing Operations Directory crash Disk directory disk header drop database EXADATA file directory filter FST gc buffer busy acquire gdb JPPD ksfqpn library cache lock ohasd ORA-00600[4193] ORA-00600[16703] ORA-04030 ORA-04031 ORA-15042 Predicate Move-Around PST push subquery Query transformations rac rebalance row cache lock set join conversion SJC systatedump truncate 磁盘组无法mount
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