db2_statistics
(PECL ibm_db2 >= 1.0.0)
Returns a result set listing the index and statistics for a table
Description
Returns a result set listing the index and statistics for a table.
Parameters
connectionA valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
qualifierA qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass null or an empty string.
schemaThe schema that contains the targeted table. If this parameter is null, the statistics and indexes are returned for the schema of the current user.
table_nameThe name of the table.
uniqueWhen
uniqueis true, the information for all indexes in the table are returned. Otherwise, only the information for unique indexes in the table are returned.
Return Values
Returns a statement resource with a result set containing rows describing the statistics and indexes for the base tables matching the specified parameters. The rows are composed of the following columns:
| Column name | Description |
|---|---|
| Return value | Parameter type |
| Return value | Parameter type |
| TABLE_CAT | The catalog that contains the table. The value is null if this table does not have catalogs. |
| TABLE_SCHEM | Name of the schema that contains the table. |
| TABLE_NAME | Name of the table. |
| NON_UNIQUE | An integer value representing whether the index prohibits unique values, or whether the row represents statistics on the table itself: Return valueParameter type0 (SQL_FALSE)The index allows duplicate values.1 (SQL_TRUE)The index values must be unique.nullThis row is statistics information for the table itself. |
| 0 (SQL_FALSE) | The index allows duplicate values. |
| 1 (SQL_TRUE) | The index values must be unique. |
| null | This row is statistics information for the table itself. |
| INDEX_QUALIFIER | A string value representing the qualifier that would have to be prepended to INDEX_NAME to fully qualify the index. |
| INDEX_NAME | A string representing the name of the index. |
| TYPE | An integer value representing the type of information contained in this row of the result set: Return valueParameter type0 (SQL_TABLE_STAT)The row contains statistics about the table itself.1 (SQL_INDEX_CLUSTERED)The row contains information about a clustered index.2 (SQL_INDEX_HASH)The row contains information about a hashed index.3 (SQL_INDEX_OTHER)The row contains information about a type of index that is neither clustered nor hashed. |
| 0 (SQL_TABLE_STAT) | The row contains statistics about the table itself. |
| 1 (SQL_INDEX_CLUSTERED) | The row contains information about a clustered index. |
| 2 (SQL_INDEX_HASH) | The row contains information about a hashed index. |
| 3 (SQL_INDEX_OTHER) | The row contains information about a type of index that is neither clustered nor hashed. |
| ORDINAL_POSITION | The 1-indexed position of the column in the index. null if the row contains statistics information about the table itself. |
| COLUMN_NAME | The name of the column in the index. null if the row contains statistics information about the table itself. |
| ASC_OR_DESC | A if the column is sorted in ascending order, D if the column is sorted in descending order, null if the row contains statistics information about the table itself. |
| CARDINALITY | If the row contains information about an index, this column contains an integer value representing the number of unique values in the index.If the row contains information about the table itself, this column contains an integer value representing the number of rows in the table. |
| PAGES | If the row contains information about an index, this column contains an integer value representing the number of pages used to store the index.If the row contains information about the table itself, this column contains an integer value representing the number of pages used to store the table. |
| FILTER_CONDITION | Always returns null. |