日常工作中经常会查看一些数据字典视图，但是也经常会记不住，只能记住个前缀，那么dict你必须的记住了，它可以帮助你找到你想要的视图。必须要记住dict~~
SQL> desc dict;
Name Null? Type
----------------------------------------- -------- ----------------------------
TABLE_NAME VARCHAR2(128)
COMMENTS VARCHAR2(4000)
SQL> desc dict;
Name Null? Type
----------------------------------------- -------- ----------------------------
TABLE_NAME VARCHAR2(128)
COMMENTS VARCHAR2(4000)
SQL> col table_name for a50
SQL> col comments for a50
SQL> set lines 120
SQL> select table_name from dict where table_name like 'DBA_HIST%';
TABLE_NAME
--------------------------------------------------
DBA_HIST_ACTIVE_SESS_HISTORY
DBA_HIST_APPLY_SUMMARY
DBA_HIST_ASH_SNAPSHOT
DBA_HIST_ASM_BAD_DISK
DBA_HIST_ASM_DISKGROUP
DBA_HIST_ASM_DISKGROUP_STAT
DBA_HIST_BASELINE
DBA_HIST_BASELINE_DETAILS
DBA_HIST_BASELINE_METADATA
DBA_HIST_BASELINE_TEMPLATE
DBA_HIST_BG_EVENT_SUMMARY
TABLE_NAME
--------------------------------------------------
DBA_HIST_BUFFERED_QUEUES
DBA_HIST_BUFFERED_SUBSCRIBERS
DBA_HIST_BUFFER_POOL_STAT
DBA_HIST_CAPTURE
DBA_HIST_CELL_CONFIG
DBA_HIST_CELL_CONFIG_DETAIL
DBA_HIST_CELL_DB
DBA_HIST_CELL_DISKTYPE
DBA_HIST_CELL_DISK_NAME
DBA_HIST_CELL_DISK_SUMMARY
DBA_HIST_CELL_GLOBAL
TABLE_NAME
--------------------------------------------------
DBA_HIST_CELL_GLOBAL_SUMMARY
DBA_HIST_CELL_IOREASON
DBA_HIST_CELL_IOREASON_NAME
DBA_HIST_CELL_METRIC_DESC
DBA_HIST_CELL_NAME
DBA_HIST_CELL_OPEN_ALERTS
DBA_HIST_CHANNEL_WAITS
DBA_HIST_CLUSTER_INTERCON
DBA_HIST_COLORED_SQL
DBA_HIST_COMP_IOSTAT
DBA_HIST_CON_SYSMETRIC_HIST
TABLE_NAME
--------------------------------------------------
DBA_HIST_CON_SYSMETRIC_SUMM
DBA_HIST_CON_SYSSTAT
DBA_HIST_CON_SYSTEM_EVENT
DBA_HIST_CON_SYS_TIME_MODEL
DBA_HIST_CR_BLOCK_SERVER
DBA_HIST_CURRENT_BLOCK_SERVER
DBA_HIST_DATABASE_INSTANCE
DBA_HIST_DATAFILE
DBA_HIST_DB_CACHE_ADVICE
DBA_HIST_DISPATCHER
DBA_HIST_DLM_MISC
TABLE_NAME
--------------------------------------------------
DBA_HIST_DYN_REMASTER_STATS
DBA_HIST_ENQUEUE_STAT
DBA_HIST_EVENT_HISTOGRAM
DBA_HIST_EVENT_NAME
DBA_HIST_FILEMETRIC_HISTORY
DBA_HIST_FILESTATXS
DBA_HIST_IC_CLIENT_STATS
DBA_HIST_IC_DEVICE_STATS
DBA_HIST_IM_SEG_STAT
DBA_HIST_IM_SEG_STAT_OBJ
DBA_HIST_INSTANCE_RECOVERY
TABLE_NAME
--------------------------------------------------
DBA_HIST_INST_CACHE_TRANSFER
DBA_HIST_INTERCONNECT_PINGS
DBA_HIST_IOSTAT_DETAIL
DBA_HIST_IOSTAT_FILETYPE
DBA_HIST_IOSTAT_FILETYPE_NAME
DBA_HIST_IOSTAT_FUNCTION
DBA_HIST_IOSTAT_FUNCTION_NAME
DBA_HIST_JAVA_POOL_ADVICE
DBA_HIST_LATCH
DBA_HIST_LATCH_CHILDREN
DBA_HIST_LATCH_MISSES_SUMMARY
TABLE_NAME
--------------------------------------------------
DBA_HIST_LATCH_NAME
DBA_HIST_LATCH_PARENT
DBA_HIST_LIBRARYCACHE
DBA_HIST_LMS_STATS
DBA_HIST_LOG
DBA_HIST_MEMORY_RESIZE_OPS
DBA_HIST_MEMORY_TARGET_ADVICE
DBA_HIST_MEM_DYNAMIC_COMP
DBA_HIST_METRIC_NAME
DBA_HIST_MTTR_TARGET_ADVICE
DBA_HIST_MUTEX_SLEEP
TABLE_NAME
--------------------------------------------------
DBA_HIST_MVPARAMETER
DBA_HIST_OPTIMIZER_ENV
DBA_HIST_OSSTAT
DBA_HIST_OSSTAT_NAME
DBA_HIST_PARAMETER
DBA_HIST_PARAMETER_NAME
DBA_HIST_PDB_INSTANCE
DBA_HIST_PDB_IN_SNAP
DBA_HIST_PERSISTENT_QMN_CACHE
DBA_HIST_PERSISTENT_QUEUES
DBA_HIST_PERSISTENT_SUBS
TABLE_NAME
--------------------------------------------------
DBA_HIST_PGASTAT
DBA_HIST_PGA_TARGET_ADVICE
DBA_HIST_PLAN_OPERATION_NAME
DBA_HIST_PLAN_OPTION_NAME
DBA_HIST_PROCESS_MEM_SUMMARY
DBA_HIST_RECOVERY_PROGRESS
DBA_HIST_REPLICATION_TBL_STATS
DBA_HIST_REPLICATION_TXN_STATS
DBA_HIST_REPORTS
DBA_HIST_REPORTS_CONTROL
DBA_HIST_REPORTS_DETAILS
TABLE_NAME
--------------------------------------------------
DBA_HIST_REPORTS_TIMEBANDS
DBA_HIST_RESOURCE_LIMIT
DBA_HIST_ROWCACHE_SUMMARY
DBA_HIST_RSRC_CONSUMER_GROUP
DBA_HIST_RSRC_METRIC
DBA_HIST_RSRC_PDB_METRIC
DBA_HIST_RSRC_PLAN
DBA_HIST_RULE_SET
DBA_HIST_SEG_STAT
DBA_HIST_SEG_STAT_OBJ
DBA_HIST_SERVICE_NAME
TABLE_NAME
--------------------------------------------------
DBA_HIST_SERVICE_STAT
DBA_HIST_SERVICE_WAIT_CLASS
DBA_HIST_SESSMETRIC_HISTORY
DBA_HIST_SESS_SGA_STATS
DBA_HIST_SESS_TIME_STATS
DBA_HIST_SGA
DBA_HIST_SGASTAT
DBA_HIST_SGA_TARGET_ADVICE
DBA_HIST_SHARED_POOL_ADVICE
DBA_HIST_SHARED_SERVER_SUMMARY
DBA_HIST_SNAPSHOT
TABLE_NAME
--------------------------------------------------
DBA_HIST_SNAP_ERROR
DBA_HIST_SQLBIND
DBA_HIST_SQLCOMMAND_NAME
DBA_HIST_SQLSTAT
DBA_HIST_SQLTEXT
DBA_HIST_SQL_BIND_METADATA
DBA_HIST_SQL_PLAN
DBA_HIST_SQL_SUMMARY
DBA_HIST_SQL_WORKAREA_HSTGRM
DBA_HIST_STAT_NAME
DBA_HIST_STREAMS_APPLY_SUM
TABLE_NAME
--------------------------------------------------
DBA_HIST_STREAMS_CAPTURE
DBA_HIST_STREAMS_POOL_ADVICE
DBA_HIST_SYSMETRIC_HISTORY
DBA_HIST_SYSMETRIC_SUMMARY
DBA_HIST_SYSSTAT
DBA_HIST_SYSTEM_EVENT
DBA_HIST_SYS_TIME_MODEL
DBA_HIST_TABLESPACE
DBA_HIST_TABLESPACE_STAT
DBA_HIST_TBSPC_SPACE_USAGE
DBA_HIST_TEMPFILE
TABLE_NAME
--------------------------------------------------
DBA_HIST_TEMPSTATXS
DBA_HIST_THREAD
DBA_HIST_TOPLEVELCALL_NAME
DBA_HIST_UNDOSTAT
DBA_HIST_WAITCLASSMET_HISTORY
DBA_HIST_WAITSTAT
DBA_HIST_WR_CONTROL
DBA_HIST_WR_SETTINGS
DBA_HISTOGRAMS
152 rows selected.
SQL> 
