PolarDB-X支持使用全局二级索引,本文将介绍如何使用SHOW GLOBAL INDEX命令查看已创建或创建中的全局二级索引。

语法

SHOW GLOBAL {INDEX | INDEXES} [FROM [schema_name.]tbl_name]

schema_nametbl_name是可选的,用于过滤表名或查看其它数据库上表的信息。

show global index; # 查询当前数据库上所有表的全局二级索引信息
show global index from xxx_tb; # 查询当前数据库上 xxx_tb 的全局二级索引信息
show global index from xxx_db.xxx_tb; # 查询 xxx_db 上 xxx_tb 的全局二级索引信息(跨库查询)

示例

mysql> show global index;
+---------------------+----------------------+------------+-------------------------------+----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------+---------------------+--------------------+------------------+---------------------+--------------------+----------+
| SCHEMA              | TABLE                | NON_UNIQUE | KEY_NAME                      | INDEX_NAMES                | COVERING_NAMES                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | INDEX_TYPE | DB_PARTITION_KEY | DB_PARTITION_POLICY | DB_PARTITION_COUNT | TB_PARTITION_KEY | TB_PARTITION_POLICY | TB_PARTITION_COUNT | STATUS   |
+---------------------+----------------------+------------+-------------------------------+----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------+---------------------+--------------------+------------------+---------------------+--------------------+----------+
| XXXX_DRDS_LOCAL_APP | full_gsi_ddl_renamed | 1          | g_i_c_ddl_c_blob_long_renamed | c_blob_long                | id, c_bit_1, c_bit_8, c_bit_16, c_bit_32, c_bit_64, c_tinyint_1, c_tinyint_1_un, c_tinyint_4, c_tinyint_4_un, c_tinyint_8, c_tinyint_8_un, c_smallint_16, c_smallint_16_un, c_mediumint_1, c_mediumint_24, c_mediumint_24_un, c_int_1, c_int_32, c_int_32_un, c_bigint_1, c_bigint_64, c_bigint_64_un, c_decimal, c_decimal_pr, c_float, c_float_pr, c_float_un, c_double, c_double_pr, c_double_un, c_date, c_datetime, c_datetime_3, c_datetime_6, c_timestamp_1, c_timestamp_3, c_time, c_time_1, c_time_3, c_time_6, c_year, c_year_4, c_char, c_varchar, c_binary, c_varbinary, c_blob_tiny, c_blob_medium, c_text_tiny, c_text, c_text_medium, c_text_long, c_enum, c_set, c_json, c_point, c_linestring, c_polygon, c_multipoint, c_multilinestring, c_multipolygon, c_geometrycollection, c_geometory                            | NULL       | c_blob_long      | HASH                | 4                  | c_blob_long      | HASH                | 3                  | PUBLIC   |
| XXXX_DRDS_LOCAL_APP | full_gsi_ddl_renamed | 1          | g_i_c_ddl_c_mediumint_1       | c_mediumint_1              | id, c_bit_1, c_bit_8, c_bit_16, c_bit_32, c_bit_64, c_tinyint_1, c_tinyint_1_un, c_tinyint_4, c_tinyint_4_un, c_tinyint_8, c_tinyint_8_un, c_smallint_16, c_smallint_16_un, c_mediumint_24, c_mediumint_24_un, c_int_1, c_int_32, c_int_32_un, c_bigint_1, c_bigint_64, c_bigint_64_un, c_decimal, c_decimal_pr, c_float, c_float_pr, c_float_un, c_double, c_double_pr, c_double_un, c_date, c_datetime, c_datetime_3, c_datetime_6, c_timestamp_1, c_timestamp_3, c_time, c_time_1, c_time_3, c_time_6, c_year, c_year_4, c_char, c_varchar, c_binary, c_varbinary, c_blob_tiny, c_blob_medium, c_blob_long, c_text_tiny, c_text, c_text_medium, c_text_long, c_enum, c_set, c_json, c_point, c_linestring, c_polygon, c_multipoint, c_multilinestring, c_multipolygon, c_geometrycollection, c_geometory, c_smallint_1, c_timestamp_6 | NULL       | c_mediumint_1    | HASH                | 4                  | c_mediumint_1    | HASH                | 3                  | PUBLIC   |
| XXXX_DRDS_LOCAL_APP | full_gsi_ddl_renamed | 1          | g_i_c_ddl_c_smallint_16_un    | c_smallint_16_un, c_time_1 | id, c_bit_1, c_bit_8, c_bit_16, c_bit_32, c_bit_64, c_tinyint_1, c_tinyint_1_un, c_tinyint_4, c_tinyint_4_un, c_tinyint_8, c_tinyint_8_un, c_smallint_16, c_mediumint_1, c_mediumint_24, c_mediumint_24_un, c_int_1, c_int_32, c_int_32_un, c_bigint_1, c_bigint_64, c_bigint_64_un, c_decimal, c_decimal_pr, c_float, c_float_pr, c_float_un, c_double, c_double_pr, c_double_un, c_date, c_datetime, c_datetime_3, c_datetime_6, c_timestamp_1, c_timestamp_3, c_time, c_time_3, c_time_6, c_year, c_year_4, c_char, c_varchar, c_binary, c_varbinary, c_blob_tiny, c_blob_medium, c_blob_long, c_text_tiny, c_text, c_text_medium, c_text_long, c_enum, c_set, c_json, c_point, c_linestring, c_polygon, c_multipoint, c_multilinestring, c_multipolygon, c_geometrycollection, c_geometory                                           | NULL       | c_smallint_16_un | HASH                | 4                  | c_smallint_16_un | HASH                | 3                  | PUBLIC   |
| XXXX_DRDS_LOCAL_APP | t_order              | 0          | g_i_seller                    | seller_id                  | id, order_id                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | HASH       | seller_id        | HASH                | 4                  | seller_id        | HASH                | 2                  | CREATING |
+---------------------+----------------------+------------+-------------------------------+----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------+---------------------+--------------------+------------------+---------------------+--------------------+----------+
4 rows in set (0.01 sec)
表 1. 列名说明
列名 说明
SCHEMA 库名
TABLE 表名
NON_UNIQUE 是否为唯一约束全局二级索引,取值范围如下:
  • 1:普通全局二级索引
  • 0:唯一约束全局二级索引
KEY_NAME 索引名
INDEX_NAMES 索引列
COVERING_NAMES 覆盖列
INDEX_TYPE 索引类型,取值范围如下:
  • NULL(即未指定)
  • BTREE
  • HASH
DB_PARTITION_KEY 分库拆分键
DB_PARTITION_POLICY 分库拆分函数
DB_PARTITION_COUNT 分库数量
TB_PARTITION_KEY 分表拆分键
TB_PARTITION_POLICY 分表拆分函数
TB_PARTITION_COUNT 分表数
STATUS 索引的当前状态,取值范围如下:
  • CREATING
  • DELETE_ONLY
  • WRITE_ONLY
  • WRITE_REORG
  • PUBLIC
  • ABSENT