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Help Center/ TaurusDB/ Kernel/ Common Kernel Functions/ DDL Optimization/ Progress Queries for Creating Secondary Indexes

Progress Queries for Creating Secondary Indexes

Updated on 2025-01-24 GMT+08:00

When PFS is disabled, creating indexes in a production environment can take a lot of time. To help you track DDL progress, this feature displays progress for time-consuming index creation operations even after performance schema has been disabled.

Constraints

  • The kernel version of your TaurusDB instance must be 2.0.51.240300 or later.
  • This feature only displays progress for creating secondary indexes, but not for creating spatial indexes, creating full-text indexes, or other DDL operations.

Functions

This feature is enabled by default. When an index is being created for a table, you can obtain the index creation progress by querying the INFORMATION_SCHEMA.INNODB_ALTER_TABLE_PROGRESS table.

Figure 1 Table structure
  • THREAD_ID: the thread ID
  • QUERY: the statement delivered by the client to create an index
  • START_TIME: the time when the command for creating an index is delivered
  • ELAPSED_TIME: the amount of time that has already been used
  • ALTER_TABLE_PHASE: the current phase
  • WORK_COMPLETED: the amount of work that has been completed so far
  • WORK_ESTIMATED: an estimate of the total amount of work required for the entire index creation process
  • TIME_REQUIRED: an estimate of how much more time is needed
  • WORK_ESTIMATED and TIME_REQUIRED will be adjusted continuously throughout the index creation process, so they do not change linearly.

Example

  1. Run the following SQL statement to query the structure of a table:

    desc table_name;

    Example:

    Query the structure of table test_stage.

    desc test_stage;
    Figure 2 Viewing the table structure

    Table test_stage does not have a secondary index, as indicated by its structure.

  2. Run the following SQL statement to add an index for a column in the table:

    ALTER TABLE table_name ADD INDEX idxa(field_name);

    Example:

    Add an index to column a in table test_stage.

    ALTER TABLE test_stage ADD INDEX idxa(a);

  3. Run the following SQL statement to query the index creation progress:

    SELECT QUERY, ALTER_TABLE_PHASE FROM INFORMATION_SCHEMA.INNODB_ALTER_TABLE_PROGRESS;

    Figure 3 Querying the index creation progress

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