[db2inst1@xifenfei ~]$ db2 connect to xff Database Connection Information Database server = DB2/LINUX 9.5.9 SQL authorization ID = DB2INST1 Local database alias = XFF[db2inst1@xifenfei ~]$ db2 list tablesTable/View Schema Type Creation time ------------------------------- --------------- ----- --------------------------T_01XFF DB2INST1 T 2012-04-11-18.23.05.723478T_02XFF DB2INST1 T 2012-04-11-18.30.26.639326T_03XFF DB2INST1 T 2012-04-11-21.33.12.479480 3 record(s) selected.[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF','T_03XFF')"STATS_TIME --------------------------2012-04-12-04.35.07.5397902012-04-11-19.55.12.0237482012-04-11-22.20.07.016905 3 record(s) selected.--收集表和索引统计信息,包括数据分布[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_01xff on all columnswith distribution and detailed indexes all"DB20000I The RUNSTATS command completed successfully.[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF')"STATS_TIME --------------------------2012-04-28-23.43.23.904759 1 record(s) selected.--收集索引统计信息,如果表没有被收集,也会同时对表收集统计信息,对不会收集数据分布信息[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_02xff for indexes all"DB20000I The RUNSTATS command completed successfully.[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF')"STATS_TIME --------------------------2012-04-28-23.43.23.9047592012-04-28-23.44.39.762858 2 record(s) selected.db2 reorg操作
--删除部分表数据[db2inst1@xifenfei ~]$ db2 "delete from t_01xff"DB20000I The SQL command completed successfully.[db2inst1@xifenfei ~]$ db2 "delete from t_03xff"DB20000I The SQL command completed successfully.--reorgchk检查是否需要进行reorg[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1Doing RUNSTATS ....Table statistics:F1: 100 * OVERFLOW / CARD < 5F2: 100 * (Effective Space Utilization of Data Pages) > 70F3: 100 * (Required Pages / Total Pages) > 80SCHEMA.NAME CARD OV NP FP ACTBLK TSIZE F1 F2 F3 REORG----------------------------------------------------------------------------------------Table: DB2INST1.T_01XFF 0 0 0 42 - 0 0 0 0 -** Table: DB2INST1.T_02XFF 371 0 42 42 - 152110 0 100 100 --- Table: DB2INST1.T_03XFF 0 0 0 83 - 0 0 0 0 -** ----------------------------------------------------------------------------------------Index statistics:F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20SCHEMA.NAME INDCARD LEAF ELEAF LVLS NDEL KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD F4 F5 F6 F7 F8 REORG --------------------------------------------------------------------------------------------------------------------------------------------------------------Table: DB2INST1.T_01XFFIndex: DB2INST1.I_T_01XFF 0 3 3 2 0 0 2 2 822 822 100 0 - 0 100 ----* --------------------------------------------------------------------------------------------------------------------------------------------------------------CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary for indexes that are not in the same sequence as the base table. When multiple indexes are defined on a table, one or more indexes may be flagged as needing REORG. Specify the most important index for REORG sequencing.Tables defined using the ORGANIZE BY clause and the corresponding dimension indexes have a '*' suffix to their names. The cardinality of a dimension index is equal to the Active blocks statistic of the table.--离线reorg index[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff index DB2INST1.I_T_01XFF allow read accessDB20000I The REORG command completed successfully.--在线reorg table[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff inplace allow write accessDB20000I The REORG command completed successfully.DB21024I This command is asynchronous and may not be effective immediately.[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_03xff inplace allow write accessDB20000I The REORG command completed successfully.DB21024I This command is asynchronous and may not be effective immediately.--证明异步操作完成[db2inst1@xifenfei ~]$ ps -ef|grep db2reodb2inst1 1496 1311 0 00:24 pts/1 00:00:00 grep db2reo--检查reorg操作结果[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1Doing RUNSTATS ....Table statistics:F1: 100 * OVERFLOW / CARD < 5F2: 100 * (Effective Space Utilization of Data Pages) > 70F3: 100 * (Required Pages / Total Pages) > 80SCHEMA.NAME CARD OV NP FP ACTBLK TSIZE F1 F2 F3 REORG----------------------------------------------------------------------------------------Table: DB2INST1.T_01XFF 0 0 0 1 - 0 0 - 0 --- Table: DB2INST1.T_02XFF 371 0 42 42 - 152110 0 100 100 --- Table: DB2INST1.T_03XFF 0 0 0 1 - 0 0 - 0 --- ----------------------------------------------------------------------------------------Index statistics:F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20SCHEMA.NAME INDCARD LEAF ELEAF LVLS NDEL KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD F4 F5 F6 F7 F8 REORG --------------------------------------------------------------------------------------------------------------------------------------------------------------Table: DB2INST1.T_01XFFIndex: DB2INST1.I_T_01XFF 0 1 0 1 0 0 2 2 822 822 100 - - 0 0 ----- --------------------------------------------------------------------------------------------------------------------------------------------------------------CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary for indexes that are not in the same sequence as the base table. When multiple indexes are defined on a table, one or more indexes may be flagged as needing REORG. Specify the most important index for REORG sequencing.Tables defined using the ORGANIZE BY clause and the corresponding dimension indexes have a '*' suffix to their names. The cardinality of a dimension index is equal to the Active blocks statistic of the table.Please refer to : http://www.xifenfei.com/3013.html