STL_DDLTEXT - Amazon Redshift

STL_DDLTEXT

Captures the following DDL statements that were run on the system.

These DDL statements include the following queries and objects:

  • CREATE SCHEMA, TABLE, VIEW

  • DROP SCHEMA, TABLE, VIEW

  • ALTER SCHEMA, TABLE

See also STL_QUERYTEXT, STL_UTILITYTEXT, and SVL_STATEMENTTEXT. These views provide a timeline of the SQL commands that are run on the system; this history is useful for troubleshooting and for creating an audit trail of all system activities.

Use the STARTTIME and ENDTIME columns to find out which statements were logged during a given time period. Long blocks of SQL text are broken into lines 200 characters long; the SEQUENCE column identifies fragments of text that belong to a single statement.

This view is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see Visibility of data in system tables and views.

Table columns

Column name Data type Description
userid integer ID of the user who generated the entry.
xid bigint Transaction ID associated with the statement.
pid integer Process ID associated with the statement.
label character(320) Either the name of the file used to run the query or a label defined with a SET QUERY_GROUP command. If the query is not file-based or the QUERY_GROUP parameter is not set, this field is blank.
starttime timestamp Time in UTC that the query started executing, with 6 digits of precision for fractional seconds. For example: 2009-06-12 11:29:19.131358.
endtime timestamp Time in UTC that the query finished executing, with 6 digits of precision for fractional seconds. For example: 2009-06-12 11:29:19.131358.
sequence integer When a single statement contains more than 200 characters, additional rows are logged for that statement. Sequence 0 is the first row, 1 is the second, and so on.
text character(200) SQL text, in 200-character increments. This field might contain special characters such as backslash (\\) and newline (\n).

Sample queries

The following query returns records that include previously run DDL statements.

select xid, starttime, sequence, substring(text,1,40) as text from stl_ddltext order by xid desc, sequence;

The following is sample output that shows four CREATE TABLE statements. The DDL statements appear in the text column, which is truncated for readability.

xid | starttime | sequence | text ------+----------------------------+----------+------------------------------------------ 1806 | 2013-10-23 00:11:14.709851 | 0 | CREATE TABLE supplier ( s_suppkey int4 N 1806 | 2013-10-23 00:11:14.709851 | 1 | s_comment varchar(101) NOT NULL ) 1805 | 2013-10-23 00:11:14.496153 | 0 | CREATE TABLE region ( r_regionkey int4 N 1804 | 2013-10-23 00:11:14.285986 | 0 | CREATE TABLE partsupp ( ps_partkey int8 1803 | 2013-10-23 00:11:14.056901 | 0 | CREATE TABLE part ( p_partkey int8 NOT N 1803 | 2013-10-23 00:11:14.056901 | 1 | ner char(10) NOT NULL , p_retailprice nu (6 rows)

Reconstructing Stored SQL

The following SQL lists rows stored in the text column of STL_DDLTEXT. The rows are ordered by xid and sequence. If the original SQL was longer than 200 characters multiple rows, STL_DDLTEXT can contain multiple rows by sequence.

SELECT xid, sequence, LISTAGG(CASE WHEN LEN(RTRIM(text)) = 0 THEN text ELSE RTRIM(text) END, '') WITHIN GROUP (ORDER BY sequence) as query_statement FROM stl_ddltext GROUP BY xid, sequence ORDER BY xid, sequence;
xid | sequence | query_statement --------+-----------+----------------- 7886671 0 create external schema schema_spectrum_uddh\nfrom data catalog\ndatabase 'spectrum_db_uddh'\niam_role ''\ncreate external database if not exists; 7886752 0 CREATE EXTERNAL TABLE schema_spectrum_uddh.soccer_league\n(\n league_rank smallint,\n prev_rank smallint,\n club_name varchar(15),\n league_name varchar(20),\n league_off decimal(6,2),\n le 7886752 1 ague_def decimal(6,2),\n league_spi decimal(6,2),\n league_nspi smallint\n)\nROW FORMAT DELIMITED \n FIELDS TERMINATED BY ',' \n LINES TERMINATED BY '\\n\\l'\nstored as textfile\nLOCATION 's 7886752 2 3://mybucket-spectrum-uddh/'\ntable properties ('skip.header.line.count'='1'); ...

To reconstruct the SQL stored in the text column of STL_DDLTEXT, run the following SQL statement. It puts together DDL statements from one or more segments in the text column. Before running the reconstructed SQL, replace any (\n) special characters with a new line in your SQL client. The results of the following SELECT statement puts together three rows in sequence order to reconstruct the SQL, in the query_statement field.

SELECT LISTAGG(CASE WHEN LEN(RTRIM(text)) = 0 THEN text ELSE RTRIM(text) END) WITHIN GROUP (ORDER BY sequence) as query_statement FROM stl_ddltext GROUP BY xid, endtime order by xid, endtime;
query_statement -------------- create external schema schema_spectrum_uddh\nfrom data catalog\ndatabase 'spectrum_db_uddh'\niam_role ''\ncreate external database if not exists; CREATE EXTERNAL TABLE schema_spectrum_uddh.soccer_league\n(\n league_rank smallint,\n prev_rank smallint,\n club_name varchar(15),\n league_name varchar(20),\n league_off decimal(6,2),\n league_def decimal(6,2),\n league_spi decimal(6,2),\n league_nspi smallint\n)\nROW FORMAT DELIMITED \n FIELDS TERMINATED BY ',' \n LINES TERMINATED BY '\\n\\l'\nstored as textfile\nLOCATION 's3://mybucket-spectrum-uddh/'\ntable properties ('skip.header.line.count'='1');