(RN); #查询没有索引的表 Select table_name from user_tables where table_name not in (select table_name from user_indexes) Select table_name from user_tables where table_name not in (select table_name from user_ind_columns) #AWR设置每隔30分钟收集一次报告,保留14天的报告 exec DBMS_WORKLOAD...
The highest partition of a global index must have a partition bound, all of whose values are MAXVALUE. This ensures that all rows in the underlying table can be represented in the index. Global prefixed indexes can be unique or nonunique. You cannot add a partition to a global index beca...
Average number of data blocks for each index value (for an index on a table) (AVG_DATA_BLOCKS_PER_KEY) Clustering factor (how well ordered the rows are about the indexed values) (CLUSTERING_FACTOR) (2)TABLE table:对表进行分析,分析的结果会放在USER_TABLES, ALL_TABLES, and DBA_TABLES表中...
--在字段上建立索引createindex INDEX_TABLENAMEonTABLENAME (COLUMN1,COLUMN2);--增加主键索引altertableT8_FOREX_EXCHANGEaddconstraintT8_FOREX_EXCHANGE_PKprimarykey (ID);--增加唯一索引altertableT8_FOREX_EXCHANGEaddconstraintT8_FOREX_EXCHANGE_DEALNOunique(DEALNO);--查询表索引select*fromuser_indexes twhe...
GRANT execute ON ctxsys.ctx_thes TO oratext; GRANT execute ON ctxsys.ctx_ulexer TO oratext; 步骤二:设置词法分析器,使用chinese_vgram_lexer作为分析器: conn oratext/oracle@service_name BEGIN --设置词法分析器 ctx_ddl.create_preference ('oratext_lexer', 'chinese_vgram_lexer'); ...
8-19 Deleting a Table... 8-21 Managing Indexes ...
The last point is particularly tricky, Joan points out. The table and columns, and even the SQL statements, may not have changed, but if the data pattern has changed, once-useful indexes may not be useful anymore while also being a drag on the performance of DML statements. Similarly, som...
The following is a list of Oracledata dictionary views that are supported by the gateway forDB2 UDB for z/OS,DB2 UDB for iSeries, andDB2/UDB DRDA servers. ALL_CATALOG ALL_COL_COMMENTS ALL_CONS_COLUMNS ALL_CONSTRAINTS ALL_INDEXES ALL_IND_COLUMNS ...
There are built-in functions that allow you to extract individual nodes from the document, and you can also build indexes on any particular node in the XMLType document. Identity datatype Oracle Database 12c introduces the identity datatype, which matches a datatype found in IBM’s DB2 data...
CockroachDB is a key-value database that supports SQL syntax. But it only supports a subset of SQL. Missing features include stored procedures, triggers, user-defined functions, cursors, geospatial functions and indexes, and XML functions. Therefore, if your applications use any of these SQL fea...