SQL Server queries table indexes and SQL Server Indexes

SQL Server queries table indexes and SQL Server Indexes

SELECT index name = a. name

, Table name = c. name

, Index field name = d. name

, Index field location = d. colid

FROM sysindexes a JOIN sysindexkeys B ON. id = B. id AND. indid = B. indid JOIN sysobjects c ON B. id = c. id JOIN syscolumns d ON B. id = d. id AND B. colid = d. colid WHERE. indid not in (0,255) -- and c. xtype = 'U' and c. status> 0 -- Query all user tables AND c. name = 'message' -- query the specified table order by c. name,. name, d. name

You need to create an index, for example:

Checks whether duplicate records exist based on a column. If the column is not a primary key, an index is created.

Create an index based on frequently queried Columns

No need to create an index

Most fields have the same content, such as male and female.

Do not create indexes for all columns. This increases the maintenance overhead time when creating new records.

Oracle queries User table Indexes

Select index_name, index_type, table_name from user_indexes where table_name = 'table name'

SQL Server queries the index of a table

SELECT TableId = O. [object_id], TableName = O. name, IndexId = ISNULL (KC. [object_id], IDX. index_id), IndexName = IDX. name, IndexType = ISNULL (KC. type_desc, 'index'), Index_Column_id = IDXC. index_column_id, ColumnID = C. column_id, ColumnName = C. name, Sort = CASE INDEXKEY_PROPERTY (IDXC. [object_id], IDXC. index_id, IDXC. index_column_id, 'isscending') WHEN 1 THEN 'desc' WHEN 0 THEN 'asc 'else' 'end, PrimaryKey = case when idx. is_primary_key = 1 THEN n' √ 'else n' END, [UQIQUE] = case when idx. is_unique = 1 THEN n' √ 'else n'' END, Ignore_dup_key = case when idx. ignore_dup_key = 1 THEN n' √ 'else n' END, Disabled = case when idx. is_disabled = 1 THEN n' √ 'else n'' END, Fill_factor = IDX. fill_factor, Padded = case when idx. is_padded = 1 THEN n' √ 'else n'' ENDFROM sys. indexes idx inner join sys. index_columns idxcon idx. [object_id] = IDXC. [object_id] and idx. index_id = IDXC. index_idLEFT JOIN sys. key_constraints kcon idx. [object_id] = KC. [parent_object_id] and idx. index_id = KC. unique_index_idINNER JOIN sys. objects oon o. [object_id] = IDX. [object_id] inner join sys. columns con o. [object_id] = C. [object_id] and o. type = 'U' and o. is_ms_shipped = 0AND IDXC. column_id = C. column_id where O. name = 'cz201 '-- cz201 is the table you want to query

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