The Severity column value of 1 is high and 4 is low. Many of the statistics used for performance tuning are stored in dynamic tables and views that are memory based. Recently I worked on a performance issue on two Oracle 11g instances (11.2.0.3 and 11.2.0.4) and I hit a bug concerning histograms and character columns. ORA-00378: buffer pools cannot be created as specified ORA-00379: no free buffers available in buffer pool for block size K ORA-00380: cannot specify db_k_cache_size since K is the standard block size ORA-00381: cannot use both new and old parameters for buffer cache size specification ORA-00382: not a valid block size, valid range [..] EP0820624A1 EP19960913783 EP96913783A EP0820624A1 EP 0820624 A1 EP0820624 A1 EP 0820624A1 EP 19960913783 EP19960913783 EP 19960913783 EP 96913783 A EP96913783 A EP 96913783A EP 0820624 A1 EP0820624 A1 EP 0820624A1 Authority EP European Patent Office Prior art keywords move set bit sub bits Prior art date 1995-04-10 Legal status (The legal status is an … ORA-00378 buffer pools cannot be created as specified ORA-00380 cannot specify db_numberk_cache_size since numberK is the standard block size ORA-00381 cannot use both new and old parameters for buffer cache size specification ORA-00383 DEFAULT cache for blocksize string cannot be reduced to zero Some statistics are stored in permanent tables, such as the statistics gathered by DBMS_STATS on database objects for use by the optimizer. News, tips, partners, and perspectives for the Oracle Linux operating system, Docker, Kubernetes, OpenStack, open source and upstream Linux kernel work Severity column represents the severity of the PMR at the time the APAR was opened. DB2 9.7 APAR Fix list contains list of APARs shipped for each fix pack in DB2 Version 9.7 for Linux, UNIX and Windows products. Performance Tuning Tools Oracle database statistics are stored in various tables and views.